Import changes for goma server

  - 789ec76a29be461d2540cfffd5e7c8fd328dc5fb fix comment in client_test.go
  - ebdafab25a0aa2e3288c4bac9b999dd59d2290b9 roll protobuf to 3.15.3
  - 68344beac18e53d32cc3b88796183d7c93bb7ce8 roll google.golang.org/grpc v1.35.0 -> v1.36.0
  - 6ce702757773f450ba4d385ba941965e256c63a9 roll go.opencensus.io v0.22.6 -> v0.23.0
  - 5ecf072d5be9f06cf5058a9bd7059259fddcee7f goma: run `go mod tidy` after `go mod download`
  - 167b599f0ca341f4a10cc6cf0bae01004880fb93 remoteexec: report unknown flag
  - dba9fd3ea0f9246412be2a54b1fa4f5a8563f552 roll protobuf to 3.15.2
  - 108b036bc2feb66c7855fd0fd5f9eea52c5b9077 roll cloud.google.com/go v0.77.0 -> v0.78.0
  - 8f3dcc059e2b0130ac89d44a5e900b4ec2d58af2 remoteexec: reply bad request, not server error
  - d28559ecc519b2edf9e8530af90ab0ee447ad71a removeexec: handle /winsysroot
  - 2813d2f262a81a2682ad10660b2cc24095a97ba1 roll protobuf to 3.15.1
  - 9c0dadc70b9b7f85a9c728734560d697e043a15a roll protobuf to 3.15.0
  - d69b3fa8e8dd235627958ba368140e77ad95166b roll protobuf to 3.14.0
  - db97f563d224ed1d7fb6bacb86ef112dc3e19bb7 roll github.com/gomodule/redigo v1.8.3 -> v1.8.4
  - 15fef80788328268a2183510b236fbecb3bef639 use go 1.16
  - 9cd4a0bf106f6d300dc4acdc5210722b701dcd49 roll cloud.google.com/go v0.76.0 -> v0.77.0
  - ea1fc6c5698322bad81fde5a35ffa23ab4bcd6da remoteexec: don't disable hardening for symlink
  - 6749dca7c476758e3f03bb347354b1674764405a fix nsjail seccomp filter for pnacl-clang++
  - bf23cfeffe67b132c66e6114956dbf01acf67131 fix nsjail seccomp filter for x86_64-nacl-clang++
  - 5d407616252431bdaa96e73cfda90db4d2df592f remoteexec: disable hardening for known commands
  - e22615c908911ff94f9a035ddf9444ca78f225ba execlog: record local_*_time
  - d7698c3c7b318d8a57b0defb31bb7d21114931bf roll google.golang.org/api v0.39.0 -> v0.40.0
  - d71ba3ca4549a1d818c4023028869c8874ff64c6 export more stats from execlog
  - 059fd8890f7b913fcb5ec38b5a4d723708e941ed roll contrib.go.opencensus.io/exporter/stackdriver v0.13....
  - 81e31abf0182addfa9f518466538a12843339f5e roll cloud.google.com/go/pubsub v1.9.1 -> v1.10.0
  - 2595d5118ab57cd9736c0791245507f9f1453e20 roll google.golang.org/api v0.38.0 -> v0.39.0
  - f715447946a7d37f11e0ee7815e77e64429afc2f roll go.opencensus.io v0.22.5 -> v0.22.6
  - 11b6fb88d1b628df1158a70060d5ff10ea988306 roll github.com/google/uuid v1.1.2 -> v1.2.0
  - 1f6f030412262a5d04544a0117c5a8a850316b63 roll github.com/gomodule/redigo v1.8.2 -> v1.8.3
  - 3d7be7d8969a96958db64a50b2d3dd38df3709b0 roll cloud.google.com/go/storage v1.12.0 -> v1.13.0
  - 80cfbd8e8c9db4aa727c475707b6df661a652a8c roll cloud.google.com/go/pubsub v1.8.2 -> v1.9.1
  - 4dfded4abf00d22dd9387140c13152126477c044 roll cloud.google.com/go v0.71.0 -> v0.76.0
  - 569662a8d1f2fb97f88f36c3e36c2e69af7538cc use go 1.15.8
  - 83b0d00fd1766e0302257634c3c4a6fb5bc7fa12 Allow 'cache-silo' as the platform property key
  - 4954de2bcc4b9978219240e8d337b4d50fc79c1b fix nsjail seccomp filter
  - 2c7855a0c8b51b0d40ef87b1615d3cfe9e9c556c distinguish runtime: nsjail-chroot and nsjail
  - 7605ba494acbba5000045e36b228ddb5ce0caca3 fix nsjail.cfg
  - 6b51c40324bd82420b036dd69964538f17f9ed94 Reland "inexpensive hardening by nsjail (seccomp-bpf)"
  - bdfc81a2b9f88989526c29b271b346a4cc54d2bd Revert "inexpensive hardening by nsjail (seccomp-bpf)"
  - d4fece1673c00514b5a8a657a68b8686e780d4d3 inexpensive hardening by nsjail (seccomp-bpf)
  - c2aae6e4eb3a2b0d85d7e8fe15d9bcba7cdce271 execlog: export cache_hit tag
  - 8aa77b857aca1af3280541ee4b737bbceed03b6f remoteexec: return unauthenticated of outputs
  - 3b83700213039f28413bdbbc505ce0f2d2e9c774 use go 1.15.7
  - ace47ad447b37d8421146bf3ed5d65b9b5699394 exec: fix api-error log
  - 43a9d54d55ff9736c132f12e33ba2e9bc9df61ce exec: log api-error
  - da01aab603dae90305a5a3a911ef96553d3937fa use go 1.15.6
  - d98544c80efde58fde08bc311ffd96534a88602c backend: fix log message
  - 5cb00c7d11a219d62716ca400563b208befd434e remoteexec: use user specified exec_root and platform pro...
  - 05e41f7e583be586446b58d6893f93b905fb1e81 Expose cache hit/miss metric
  - b97de93783107c45e7a682246a4621b22f888544 auth: don't cache context error of check group
  - 81db8d99fff4f8a66ac35725187b8dc7cd4bde3e Add dashboard setting files
  - 8e76e461279083d0a1d8bd692c529e1064b645c8 server: fix keepalive
  - 9897ca742639b0bdc5734438f61ea45dc5f5600f remoteexec: ignore environment variables for clang-cl rel...
  - 80bf8c20a7159c89f3654f2c202782bbf954f5a6 backend: don't specify max_concurrent_streams_low_watermark
  - a0ddb057e63f9694b81df5256cc3800537388e95 Mark -Wa,--fatal-warnings as relocatable
  - 49d5d5b8cf566b14fac126fec4686e6efec6c8cc backend: remote uses remote-apis-sdks grpc balancer.
  - ce907cb9278c4b89a0d844d76837733a5ce90fef httprpc: increase timeout
  - c46a4f8b8696944eaee23157d3fef6c13d31c196 redis: make max number of idle/active connections configu...
  - 29a6b80deac9a48446dcb070f6eb00297cbf7c2f Revert "enable grpc compression"
  - 2289ee211830cc1908d607f4098bb5891efdf33e cas: when failed to upload blobs, set it as missing inputs
  - ae6a505cce8431662bdf44a7bfe44798450c2544 remoteexec: don't retry with FailedPrecondition
  - 0679e405156fbfbeb360dc279763e3a2f61a8bb1 remoteexec: raise timeout of input
  - 04552c369a1d9280998a4914d57c6d2f00b8c70b execlog: export os_family key for execlog/requests, handl...
  - dcbb5c8e1b822739ed04d7abaed115968d98819b use go 1.15.5
  - 1e7e0220191c19617a993ad98a53c9d3546e6f5a server: enable grpc compression inside GKE
  - fdb4ebda473020b0b1f01d1d330131fadd70ff0b execlog_server emits metrics from ExecLog
  - 61d2a8150c4aecc64e4a54b2cb268f3f41aa2608 fix typo in default instance name
  - 1ed0a4fb213b53700deaca985dc6323e0d7470f0 enable grpc compression
  - 365db0d525c4e2bc1085d40c9aefa6419d0f13a0 k8s: use east_instance in us-east1-1
  - 5b9f5e2e1e2aa60a1ad9c1fa867f82a06a1e22e2 add acl in toolchain
  - d74bf121a0508e242afcf5bde664e528bda6fa68 remoteexec: assume 4MB/s for output
  - 50a55c467ff9014ad2d42d4e4818d8ff7ad4c449 roll google.golang.org/grpc v1.33.1 -> v1.33.2
  - d507cfbfb0e40c7707f7e152a1987ca2a6842926 Add -additional-tls-certificate to add a root cert
  - 788934cfc14369368a1f43114487c8c286188665 use go 1.15.4
  - 3b55f37dd68a14012b3eab6a767f782368679537 roll google.golang.org/api v0.34.0 -> v0.35.0
  - 4de9f623236bb1b4ca5c82e1ec8c5d04856aab2b roll cloud.google.com/go/pubsub v1.8.1 -> v1.8.2
  - c6f49d0725405322534c99aa6145efdfcbfb67b4 roll cloud.google.com/go v0.69.1 -> v0.71.0
  - 6d7627995fd166d0007f9a69e9330871d4ad6d2e auth: set 3 sec timeout to access authdb
  - e16437249f1b50d9c1bdd93c12beaffa65247cc1 Reland "roll cloud.google.com/go v0.68.0 -> v0.69.1"
  - 9e8abe8ebb7d8b91107d3b41ca3fed827831f31d Reland "roll go.opencensus.io v0.22.4 -> v0.22.5"
  - c8bf7db863321ae200676ea6ec36b15fbcbef163 Revert "roll cloud.google.com/go v0.68.0 -> v0.69.1"
  - 7be533cb19c2a4a98bbc2517b68f2e65380ce9b8 Revert "roll go.opencensus.io v0.22.4 -> v0.22.5"
  - 6ac746102c046530c289a9a029a597d994ed3765 Revert "use one redis conn per ExecReq"
  - d680a1b9184ca6542a9db4e53a173898dc4743bb use go 1.15.3
  - 318622046bce4819de177f1bbd8f158a61e0c8ba use one redis conn per ExecReq
  - 27837a44f763190a6205c3e14f9938a534636b66 roll github.com/golang/protobuf v1.4.2 -> v1.4.3
  - 46388efb73fa6240e86d384675cb508ae6ba1455 roll cloud.google.com/go v0.68.0 -> v0.69.1
  - 280e25a5ff68c6cdd507e025c6c5fcfd0e4c381c remoteexec: record client retries
  - a74eb41e7ab82c27955f440e22063314270d8d16 redis stress test
  - bffab0ef448876cac055d01a55c4d315dbb5eea2 roll google.golang.org/api v0.32.0 -> v0.33.0
  - 2c5891031f0d77449acbf22c0d08ebb0b87793cd remoteexec: make span timeout configurable
  - a0f2f1cdf4d894fec6360b15837c12be46ef2569 remoteexec: dynamically sets timeout to fetch output file
  - 86130a48f3de1ae6c21d7b2ed1c3d8147c03ce2b Mark -mllvm -enable-dse-memoryssa={true,false} as relocat...
  - a09ac0418d373bc48bf228c9359fc6e94f521fda roll go.opencensus.io v0.22.4 -> v0.22.5
  - bd2bdb37b41b5cec97a91fc9d2f81740392eee0e roll cloud.google.com/go/pubsub v1.6.2 -> v1.8.1
  - 8e2369cd47db09a74cf16d6e7862e715d2581680 roll cloud.google.com/go v0.66.0 -> v0.68.0
  - 94e8e5d88b4c6b42d0dc85cff3ec86a32208d928 redis: log for long wait for pool
  - e509e210bcb4eb2fdb5a5dc8cb29689bb9ac840b redis: Pool wait in client.
  - d7e22538e48d83a98c342b6013a8ef1b8363b47f remotexec: log Adapter.Exec error
  - b917d702a7901f5f15920f1ce3c5663f1039e950 redis: don't use Pool.Wait=true
  (And 21 more changes)

TBR=yyanagisawa@google.com, yekuang@google.com
GitOrigin-RevId: 789ec76a29be461d2540cfffd5e7c8fd328dc5fb
Change-Id: Id8b1860d617100a593460e6d624598c4bbada41b
diff --git a/auth/acl/checker.go b/auth/acl/checker.go
index 6d787cf..dc48b20 100644
--- a/auth/acl/checker.go
+++ b/auth/acl/checker.go
@@ -14,6 +14,7 @@
 	"golang.org/x/oauth2"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
 	"go.chromium.org/goma/server/auth"
 	"go.chromium.org/goma/server/auth/account"
@@ -119,6 +120,11 @@
 		logger.Debugf("group:%s use service account:%s", g.Id, g.ServiceAccount)
 		return g.Id, saToken, nil
 	}
+	if ctx.Err() != nil {
+		err := status.FromContextError(ctx.Err()).Err()
+		logger.Errorf("acl check context error: %v", err)
+		return "", nil, err
+	}
 	logger.Errorf("no acl match")
 	return "", nil, grpc.Errorf(codes.PermissionDenied, "access rejected")
 }
diff --git a/auth/authdb/client.go b/auth/authdb/client.go
index 680ef22..1a58f7b 100644
--- a/auth/authdb/client.go
+++ b/auth/authdb/client.go
@@ -6,6 +6,7 @@
 
 import (
 	"context"
+	"time"
 
 	"go.chromium.org/goma/server/httprpc"
 	"go.chromium.org/goma/server/log"
@@ -28,6 +29,8 @@
 	}
 	resp := &pb.CheckMembershipResp{}
 	err := rpc.Retry{}.Do(ctx, func() error {
+		ctx, cancel := context.WithTimeout(ctx, 3*time.Second)
+		defer cancel()
 		return c.Client.Call(ctx, req, resp)
 	})
 	if err != nil {
diff --git a/auth/service.go b/auth/service.go
index 7464a34..c629fa2 100644
--- a/auth/service.go
+++ b/auth/service.go
@@ -123,19 +123,28 @@
 				te.Group, te.Token, err = s.checkToken(ctx, token, te.TokenInfo)
 				if err != nil {
 					te.TokenInfo.Err = err
+					// set 30 seconds negative cache (rejected user / wrong config).
+					// more than exiryDelta (10 secs)
+					// less than client ping timeout.
+					te.TokenInfo.ExpiresAt = time.Now().Add(30 * time.Second)
 				}
 				if te.Token != nil && !te.Token.Expiry.IsZero() && te.Token.Expiry.Before(te.TokenInfo.ExpiresAt) {
 					te.TokenInfo.ExpiresAt = te.Token.Expiry
 				}
 			}
-			go s.scheduledRun(expiryTime(te.TokenInfo.ExpiresAt), func() {
+			switch status.Code(te.TokenInfo.Err) {
+			case codes.OK, codes.PermissionDenied, codes.Internal:
+				go s.scheduledRun(expiryTime(te.TokenInfo.ExpiresAt), func() {
+					s.mu.Lock()
+					delete(s.tokenCache, k)
+					s.mu.Unlock()
+				})
 				s.mu.Lock()
-				delete(s.tokenCache, k)
+				s.tokenCache[k] = te
 				s.mu.Unlock()
-			})
-			s.mu.Lock()
-			s.tokenCache[k] = te
-			s.mu.Unlock()
+			default:
+				// don't cache other error data.
+			}
 			return te, nil
 		})
 		if err != nil {
diff --git a/backend/mixer.go b/backend/mixer.go
index cb59991..254853c 100644
--- a/backend/mixer.go
+++ b/backend/mixer.go
@@ -28,7 +28,7 @@
 	case *pb.BackendMapping_Remote:
 		return FromRemoteBackend(ctx, be.Remote, opt)
 	case nil:
-		return nil, func() {}, fmt.Errorf("no backend for %s", groupId)
+		return nil, func() {}, fmt.Errorf("no backend for group:%q", groupId)
 	default:
 		return nil, func() {}, fmt.Errorf("unknown type in %s: %T", groupId, cfg.Backend)
 	}
@@ -169,7 +169,7 @@
 		q := req.URL.Query()
 		backend, found := m.selectBackend(ctx, user.Group, q)
 		if !found {
-			logger.Errorf("no backend config for %s %s", user.Group, q.Encode())
+			logger.Errorf("no backend config for group:%q query:%q", user.Group, q.Encode())
 			http.Error(w, "no backend config", http.StatusInternalServerError)
 			return
 		}
diff --git a/backend/remote.go b/backend/remote.go
index f6352f3..dc429e7 100644
--- a/backend/remote.go
+++ b/backend/remote.go
@@ -12,12 +12,16 @@
 	"strings"
 	"time"
 
+	"github.com/bazelbuild/remote-apis-sdks/go/pkg/balancer"
+	bpb "github.com/bazelbuild/remote-apis-sdks/go/pkg/balancer/proto"
+	"github.com/bazelbuild/remote-apis-sdks/go/pkg/client"
 	"go.opencensus.io/plugin/ocgrpc"
 	bspb "google.golang.org/genproto/googleapis/bytestream"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/keepalive"
 
+	"go.chromium.org/goma/server/log"
 	pb "go.chromium.org/goma/server/proto/backend"
 	execpb "go.chromium.org/goma/server/proto/exec"
 	execlogpb "go.chromium.org/goma/server/proto/execlog"
@@ -27,12 +31,41 @@
 // FromRemoteBackend creates new GRPC from cfg.
 // returned func would release resources associated with GRPC.
 func FromRemoteBackend(ctx context.Context, cfg *pb.RemoteBackend, opt Option) (GRPC, func(), error) {
-	conn, err := grpc.DialContext(ctx, cfg.Address,
+	logger := log.FromContext(ctx)
+	opts := []grpc.DialOption{
 		grpc.WithTransportCredentials(credentials.NewTLS(&tls.Config{})),
 		grpc.WithStatsHandler(&ocgrpc.ClientHandler{}),
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
 			Time: 10 * time.Second,
-		}))
+		}),
+	}
+	// TODO: configurable?
+	// use the same default as re-client (remote-apis-sdks).
+	// but don't set MaxConcurrentStreamsLowWatermark not to
+	// open more connections to avoid "Too many open files" error
+	// in nginx.  crbug.com/1151576
+	ac := &bpb.ApiConfig{
+		ChannelPool: &bpb.ChannelPoolConfig{
+			MaxSize: client.DefaultMaxConcurrentRequests,
+		},
+		Method: []*bpb.MethodConfig{
+			{
+				Name: []string{".*"},
+				Affinity: &bpb.AffinityConfig{
+					Command:     bpb.AffinityConfig_BIND,
+					AffinityKey: "bind-affinity",
+				},
+			},
+		},
+	}
+	logger.Infof("api_config=%s", ac)
+	grpcInt := balancer.NewGCPInterceptor(ac)
+	opts = append(opts,
+		grpc.WithBalancerName(balancer.Name),
+		grpc.WithUnaryInterceptor(grpcInt.GCPUnaryClientInterceptor),
+		grpc.WithStreamInterceptor(grpcInt.GCPStreamClientInterceptor))
+
+	conn, err := grpc.DialContext(ctx, cfg.Address, opts...)
 	if err != nil {
 		return GRPC{}, func() {}, err
 	}
diff --git a/cache/redis/client.go b/cache/redis/client.go
index 40bae91..66203cc 100644
--- a/cache/redis/client.go
+++ b/cache/redis/client.go
@@ -11,10 +11,14 @@
 	"net"
 	"os"
 	"syscall"
+	"time"
 
 	"github.com/gomodule/redigo/redis"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
+	"go.chromium.org/goma/server/log"
 	pb "go.chromium.org/goma/server/proto/cache"
 	"go.chromium.org/goma/server/rpc"
 )
@@ -23,6 +27,9 @@
 type Client struct {
 	prefix string
 	pool   *redis.Pool
+
+	// to workaround pool.wait. maintain active conns.
+	sema chan struct{}
 }
 
 // AddrFromEnv returns redis server address from environment variables.
@@ -38,18 +45,39 @@
 	return fmt.Sprintf("%s:%s", host, port), nil
 }
 
+// Opts is redis client option.
+type Opts struct {
+	// Prefix is key prefix used by the client.
+	Prefix string
+
+	// MaxIdleConns is max number of idle connections.
+	MaxIdleConns int
+
+	// MaxActiveConns is max number of active connections.
+	MaxActiveConns int
+}
+
+// default max number of connections.
+// note: in GCP, redis quota is 65,000
+const (
+	DefaultMaxIdleConns   = 50
+	DefaultMaxActiveConns = 200
+)
+
 // NewClient creates new cache client for redis.
-func NewClient(ctx context.Context, addr, prefix string) Client {
+func NewClient(ctx context.Context, addr string, opts Opts) Client {
 	return Client{
-		prefix: prefix,
+		prefix: opts.Prefix,
 		pool: &redis.Pool{
-			Dial: func() (redis.Conn, error) {
-				return redis.Dial("tcp", addr)
+			DialContext: func(ctx context.Context) (redis.Conn, error) {
+				return redis.DialContext(ctx, "tcp", addr)
 			},
-			MaxIdle:   10,
-			MaxActive: 200,
-			Wait:      true,
+			MaxIdle:   opts.MaxIdleConns,
+			MaxActive: opts.MaxActiveConns,
+			// https://github.com/gomodule/redigo/issues/520
+			Wait: false,
 		},
+		sema: make(chan struct{}, opts.MaxActiveConns),
 	}
 }
 
@@ -79,6 +107,9 @@
 
 // retryErr converts err to rpc.RetriableError if it is retriable error.
 func retryErr(err error) error {
+	if errors.Is(err, redis.ErrNil) {
+		return status.Error(codes.NotFound, err.Error())
+	}
 	// retriable if temporary error.
 	if terr, ok := err.(temporary); ok && terr.Temporary() {
 		return rpc.RetriableError{
@@ -99,9 +130,47 @@
 	return err
 }
 
+type activeConn struct {
+	redis.Conn
+	c Client
+}
+
+func (c activeConn) Close() error {
+	<-c.c.sema
+	return c.Conn.Close()
+}
+
+func (c Client) poolGetContext(ctx context.Context) (redis.Conn, error) {
+	t := time.Now()
+	select {
+	case c.sema <- struct{}{}:
+		d := time.Since(t)
+		if d > 100*time.Millisecond {
+			logger := log.FromContext(ctx)
+			logger.Warnf("redis pool wait %s actives=%d", d, len(c.sema))
+		}
+		conn, err := c.pool.GetContext(ctx)
+		if err != nil {
+			<-c.sema
+			return nil, err
+		}
+		return activeConn{
+			Conn: conn,
+			c:    c,
+		}, nil
+	case <-ctx.Done():
+		d := time.Since(t)
+		if d > 100*time.Millisecond {
+			logger := log.FromContext(ctx)
+			logger.Warnf("redis pool timed-out wait %s actives=%d", d, len(c.sema))
+		}
+		return nil, ctx.Err()
+	}
+}
+
 // Get fetches value for the key from redis.
 func (c Client) Get(ctx context.Context, in *pb.GetReq, opts ...grpc.CallOption) (*pb.GetResp, error) {
-	conn, err := c.pool.GetContext(ctx)
+	conn, err := c.poolGetContext(ctx)
 	if err != nil {
 		return nil, err
 	}
@@ -127,7 +196,7 @@
 
 // Put stores key:value pair on redis.
 func (c Client) Put(ctx context.Context, in *pb.PutReq, opts ...grpc.CallOption) (*pb.PutResp, error) {
-	conn, err := c.pool.GetContext(ctx)
+	conn, err := c.poolGetContext(ctx)
 	if err != nil {
 		return nil, err
 	}
diff --git a/cache/redis/client_test.go b/cache/redis/client_test.go
new file mode 100644
index 0000000..e4c1d9b
--- /dev/null
+++ b/cache/redis/client_test.go
@@ -0,0 +1,69 @@
+// Copyright 2020 Google LLC. All Rights Reserved.
+
+package redis
+
+import (
+	"context"
+	"flag"
+	"sync"
+	"testing"
+	"time"
+
+	"go.uber.org/zap"
+
+	"go.chromium.org/goma/server/log"
+	pb "go.chromium.org/goma/server/proto/cache"
+)
+
+var (
+	numFilesPerExecReq = flag.Int("num_files_per_exec_req", 500, "number of files per ExecReq for BenchmarkGet")
+)
+
+func BenchmarkGet(b *testing.B) {
+	log.SetZapLogger(zap.NewNop())
+	s := NewFakeServer(b)
+
+	ctx := context.Background()
+	c := NewClient(ctx, s.Addr().String(), Opts{
+		MaxIdleConns:   DefaultMaxIdleConns,
+		MaxActiveConns: DefaultMaxActiveConns,
+	})
+	defer c.Close()
+
+	b.Logf("b.N=%d", b.N)
+	var wg sync.WaitGroup
+	var (
+		mu    sync.Mutex
+		nerrs int
+	)
+	wg.Add(b.N)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		go func() {
+			defer wg.Done()
+			ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+			defer cancel()
+
+			var rg sync.WaitGroup
+			rg.Add(*numFilesPerExecReq)
+			for i := 0; i < *numFilesPerExecReq; i++ {
+				go func() {
+					defer rg.Done()
+					_, err := c.Get(ctx, &pb.GetReq{
+						Key: "key",
+					})
+					if err != nil {
+						mu.Lock()
+						nerrs++
+						mu.Unlock()
+					}
+				}()
+			}
+			rg.Wait()
+		}()
+	}
+	wg.Wait()
+	mu.Lock()
+	b.Logf("nerrs=%d", nerrs)
+	mu.Unlock()
+}
diff --git a/cache/redis/fake_redis.go b/cache/redis/fake_redis.go
new file mode 100644
index 0000000..e8b0046
--- /dev/null
+++ b/cache/redis/fake_redis.go
@@ -0,0 +1,109 @@
+// Copyright 2020 Google LLC. All Rights Reserved.
+
+package redis
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"net"
+	"strconv"
+	"testing"
+)
+
+// FakeServer is a fake redis server for stress test.
+type FakeServer struct {
+	ln net.Listener
+	tb testing.TB
+}
+
+// NewFakeServer starts a new fake redis server.
+func NewFakeServer(tb testing.TB) *FakeServer {
+	ln, err := net.Listen("tcp", "")
+	if err != nil {
+		tb.Fatal(err)
+	}
+	s := &FakeServer{ln: ln, tb: tb}
+	go s.serve()
+	tb.Cleanup(func() { s.Close() })
+	return s
+}
+
+// Addr returns address of the fake redis server.
+func (s *FakeServer) Addr() net.Addr {
+	return s.ln.Addr()
+}
+
+// Close shuts down the fake redis server.
+func (s *FakeServer) Close() {
+	s.ln.Close()
+}
+
+func (s *FakeServer) serve() {
+	for {
+		conn, err := s.ln.Accept()
+		if err != nil {
+			return
+		}
+		go s.handle(conn)
+	}
+}
+
+func (s *FakeServer) handle(conn net.Conn) {
+	defer conn.Close()
+	b := bufio.NewReader(conn)
+	for {
+		_, err := s.readRequest(b)
+		if err != nil {
+			return
+		}
+		// s.tb.Logf("request: %q", line)
+		// assume GET
+		// *2\r\n$3\r\nGET\r\n$3\r\nkey\r\n
+
+		conn.Write([]byte("$10\r\n0123456789\r\n"))
+	}
+}
+
+func (s *FakeServer) readRequest(r *bufio.Reader) ([]byte, error) {
+	var line []byte
+	nline, _, err := r.ReadLine()
+	if err != nil {
+		return nil, err
+	}
+	line = append(line, nline...)
+	if !bytes.HasPrefix(nline, []byte("*")) {
+		return line, err
+	}
+	// *<n> array
+	n, err := strconv.Atoi(string(nline[1:]))
+	if err != nil {
+		return line, fmt.Errorf("wrong array %q: %v", nline, err)
+	}
+	for i := 0; i < n; i++ {
+		nline, _, err := r.ReadLine()
+		if err != nil {
+			return line, err
+		}
+		line = append(line, '\n')
+		line = append(line, nline...)
+		if !bytes.HasPrefix(nline, []byte("$")) {
+			continue
+		}
+		// $<n>\r\n<value>\r\n
+		sz, err := strconv.Atoi(string(nline[1:]))
+		if err != nil {
+			return line, fmt.Errorf("wrong bytes %q: %v", nline, err)
+		}
+		nline, _, err = r.ReadLine()
+		if err != nil {
+			return line, err
+		}
+		line = append(line, '\n')
+		line = append(line, nline...)
+		if sz != len(nline) {
+			return line, fmt.Errorf("unexpected value sz=%d v=%q", sz, nline)
+		}
+	}
+	return line, nil
+}
diff --git a/cipd_manifest.txt b/cipd_manifest.txt
index 9574385..681c246 100644
--- a/cipd_manifest.txt
+++ b/cipd_manifest.txt
@@ -13,9 +13,9 @@
 # https://chrome-infra-packages.appspot.com/
 
 # go
-infra/3pp/tools/go/${platform} version:1.15
+infra/3pp/tools/go/${platform} version:1.16
 
 # protoc
 # If the version you want is missing, please follow the instruction in:
 # https://chromium.googlesource.com/infra/infra/+/refs/heads/master/bootstrap/cipd/doc/infra/tools/protoc/
-infra/tools/protoc/${platform} protobuf_version:v3.13.0
+infra/tools/protoc/${platform} protobuf_version:v3.15.3
diff --git a/cipd_manifest.versions b/cipd_manifest.versions
index c494680..1900f25 100644
--- a/cipd_manifest.versions
+++ b/cipd_manifest.versions
@@ -2,9 +2,9 @@
 # Do not modify manually. All changes will be overwritten.
 
 infra/3pp/tools/go/linux-amd64
-	version:1.15
-	xmu8oShY9L8zjMBvfYOOPki8xHNHphUfF1v1o4W-TyoC
+	version:1.16
+	MxMgv8pi7utBtJGyURlZNC03jAiV-hUbo0Qk7u9MNOEC
 
 infra/tools/protoc/linux-amd64
-	protobuf_version:v3.13.0
-	gV4kmbFUUWoo9_71iWLRL9fB9DkQoOvyuqdKm9lu5P0C
+	protobuf_version:v3.15.3
+	iybrJKcHxYG5uY9dj6Or1-r4ifJIY270CTA5c6EJI34C
diff --git a/cmd/exec_server/main.go b/cmd/exec_server/main.go
index 2fd0d9e..3e6b08f 100644
--- a/cmd/exec_server/main.go
+++ b/cmd/exec_server/main.go
@@ -18,6 +18,7 @@
 	"math/rand"
 	"net/http"
 	"path"
+	"strings"
 	"time"
 
 	rpb "github.com/bazelbuild/remote-apis/build/bazel/remote/execution/v2"
@@ -66,8 +67,9 @@
 	pubsubProjectID    = flag.String("pubsub-project-id", "", "project id for pubsub")
 	serviceAccountFile = flag.String("service-account-file", "", "service account json file")
 
-	remoteexecAddr       = flag.String("remoteexec-addr", "", "use remoteexec API endpoint")
-	remoteInstancePrefix = flag.String("remote-instance-prefix", "", "remote instance name path prefix.")
+	remoteexecAddr         = flag.String("remoteexec-addr", "", "use remoteexec API endpoint")
+	remoteInstancePrefix   = flag.String("remote-instance-prefix", "", "remote instance name path prefix.")
+	remoteInstanceBaseName = flag.String("remote-instance-basename", "default_instance", "remote instance basename under remote-instance-prefix")
 
 	// http://b/141901653
 	execMaxRetryCount = flag.Int("exec-max-retry-count", 5, "max retry count for exec call. 0 is unlimited count, but bound to ctx timtout. Use small number for powerful clients to run local fallback quickly. Use large number for powerless clients to use remote more than local.")
@@ -84,7 +86,33 @@
 	// rbe-staging1 uses 2.2M keys (< 512MB memory usage in redis).
 	maxDigestCacheEntries = flag.Int("max-digest-cache-entries", 2e6, "maximum entries in in-memory digest cache. 0 means unimited")
 
+	// nsjail is applied in hardened request.
+	// note windows and chroot reqs are out of scope for the ratio.
+	// e.g.
+	//   hadening-ratio=0
+	//   nsjail-rario=<any>
+	//   => no hardening (no runsc nor nsjail) at all
+	//
+	//   hardening-ratio=1
+	//   nsjail-ratio=0
+	//   => hardening by runsc only
+	//
+	//   hardening-ratio=1
+	//   nsjail-ratio=1
+	//   => hardening by nsjail only
+	//
+	//   hardening-ratio=0.5
+	//   nsjail-ratio=0.5
+	//   => no hardeing 50%
+	//      hardening 50%
+	//        nsjail 25%  (50% in hardening)
+	//        runsc 25%   (50% in hardening)
 	experimentHardeningRatio = flag.Float64("experiment-hardening-ratio", 0, "Ratio [0,1] to enable hardening. 0=no hardening. 1=all hardening.")
+	experimentNsjailRatio    = flag.Float64("experiment-nsjail-ratio", 0, "Ratio [0,1] to use nsjail for hardening. 0=no nsjial (ie. runsc), 1=all nsjail.")
+	disableHardenings        = flag.String("disable-hardenings", "", "comma separated sha256 file hashes of command to disable hardening (i.e. for ELF-32)")
+
+	redisMaxIdleConns   = flag.Int("redis-max-idle-conns", redis.DefaultMaxIdleConns, "maximum number of idle connections to redis.")
+	redisMaxActiveConns = flag.Int("redis-max-active-conns", redis.DefaultMaxActiveConns, "maximum number of active connections to redis.")
 )
 
 var (
@@ -280,11 +308,24 @@
 		logger.Warnf("redis disabled for gomafile-digest: %v", err)
 		return digest.NewCache(nil, *maxDigestCacheEntries)
 	}
-	logger.Infof("redis enabled for gomafile-digest: %v", addr)
-	return digest.NewCache(redis.NewClient(ctx, addr, "gomafile-digest:"), *maxDigestCacheEntries)
+	logger.Infof("redis enabled for gomafile-digest: %v idle=%d active=%d", addr, *redisMaxIdleConns, *redisMaxActiveConns)
+	return digest.NewCache(redis.NewClient(ctx, addr, redis.Opts{
+		Prefix:         "gomafile-digest:",
+		MaxIdleConns:   *redisMaxIdleConns,
+		MaxActiveConns: *redisMaxActiveConns,
+	}), *maxDigestCacheEntries)
 }
 
 func main() {
+	spanTimeout := remoteexec.DefaultSpanTimeout
+	flag.DurationVar(&spanTimeout.Inventory, "exec-inventory-timeout", spanTimeout.Inventory, "timeout of exec-inventory")
+	flag.DurationVar(&spanTimeout.InputTree, "exec-input-tree-timeout", spanTimeout.InputTree, "timeout of exec-iput-tree")
+	flag.DurationVar(&spanTimeout.Setup, "exec-setup-timeout", spanTimeout.Setup, "timeout of exec-setup")
+	flag.DurationVar(&spanTimeout.CheckCache, "exec-check-cache-timeout", spanTimeout.CheckCache, "timeout of exec-check-cache")
+	flag.DurationVar(&spanTimeout.CheckMissing, "exec-check-missing-timeout", spanTimeout.CheckMissing, "timeout of exec-check-missing")
+	flag.DurationVar(&spanTimeout.UploadBlobs, "exec-upload-blobs-timeout", spanTimeout.UploadBlobs, "timeout of exec-upload-blobs")
+	flag.DurationVar(&spanTimeout.Execute, "exec-execute-timeout", spanTimeout.Execute, "timeout of exec-execute")
+	flag.DurationVar(&spanTimeout.Response, "exec-response-timeout", spanTimeout.Response, "timeout of exec-response")
 	flag.Parse()
 	rand.Seed(time.Now().UnixNano())
 
@@ -379,9 +420,12 @@
 	}
 	casBlobLookupConcurrency := 20
 	outputFileConcurrency := 20
+	logger.Infof("span timeout = %#v", spanTimeout)
 	re := &remoteexec.Adapter{
-		InstancePrefix: *remoteInstancePrefix,
-		ExecTimeout:    15 * time.Minute,
+		InstancePrefix:   *remoteInstancePrefix,
+		InstanceBaseName: *remoteInstanceBaseName,
+		ExecTimeout:      15 * time.Minute,
+		SpanTimeout:      spanTimeout,
 		Client: remoteexec.Client{
 			ClientConn: reConn,
 			Retry: rpc.Retry{
@@ -398,7 +442,10 @@
 		CASBlobLookupSema: make(chan struct{}, casBlobLookupConcurrency),
 		OutputFileSema:    make(chan struct{}, outputFileConcurrency),
 		HardeningRatio:    *experimentHardeningRatio,
+		NsjailRatio:       *experimentNsjailRatio,
+		DisableHardenings: strings.Split(*disableHardenings, ","),
 	}
+	logger.Infof("hardeniong=%f nsjail=%f", re.HardeningRatio, re.NsjailRatio)
 
 	if *cmdFilesBucket == "" {
 		logger.Warnf("--cmd-files-bucket is not given. support only ARBITRARY_TOOLCHAIN_SUPPORT enabled client")
@@ -414,7 +461,7 @@
 	// expose bytestream proxy.
 	bs := &remoteexec.ByteStream{
 		Adapter:      re,
-		InstanceName: re.DefaultInstance(),
+		InstanceName: re.Instance(),
 		// TODO: Create bytestreams for multiple instances.
 	}
 	bspb.RegisterByteStreamServer(s.Server, bs)
diff --git a/cmd/execlog_server/main.go b/cmd/execlog_server/main.go
index 1383ee7..ab9d1ab 100644
--- a/cmd/execlog_server/main.go
+++ b/cmd/execlog_server/main.go
@@ -13,6 +13,7 @@
 	"flag"
 	"net/http"
 
+	"go.opencensus.io/stats/view"
 	"go.opencensus.io/trace"
 	"go.opencensus.io/zpages"
 	"google.golang.org/grpc"
@@ -45,6 +46,11 @@
 	if err != nil {
 		logger.Fatal(err)
 	}
+	err = view.Register(execlog.DefaultViews...)
+	if err != nil {
+		logger.Fatal(err)
+	}
+
 	trace.ApplyConfig(trace.Config{
 		DefaultSampler: server.NewLimitedSampler(server.DefaultTraceFraction, server.DefaultTraceQPS),
 	})
diff --git a/cmd/file_server/main.go b/cmd/file_server/main.go
index b4bf4ce..09d8e6f 100644
--- a/cmd/file_server/main.go
+++ b/cmd/file_server/main.go
@@ -43,6 +43,9 @@
 	traceProjectID = flag.String("trace-project-id", "", "project id for cloud tracing")
 
 	serviceAccountFile = flag.String("service-account-file", "", "service account json file")
+
+	redisMaxIdleConns   = flag.Int("redis-max-idle-conns", redis.DefaultMaxIdleConns, "maximum number of idle connections to redis.")
+	redisMaxActiveConns = flag.Int("redis-max-active-conns", redis.DefaultMaxActiveConns, "maximum number of active connections to redis.")
 )
 
 type admissionController struct {
@@ -99,8 +102,12 @@
 	addr, err := redis.AddrFromEnv()
 	switch {
 	case err == nil:
-		logger.Infof("redis enabled for gomafile: %s", addr)
-		c := redis.NewClient(ctx, addr, "gomafile:")
+		logger.Infof("redis enabled for gomafile: %s  idle=%d active=%d", addr, *redisMaxIdleConns, *redisMaxActiveConns)
+		c := redis.NewClient(ctx, addr, redis.Opts{
+			Prefix:         "gomafile:",
+			MaxIdleConns:   *redisMaxIdleConns,
+			MaxActiveConns: *redisMaxActiveConns,
+		})
 		defer c.Close()
 		cclient = c
 
diff --git a/cmd/remoteexec_proxy/main.go b/cmd/remoteexec_proxy/main.go
index 502cc10..97bd04a 100644
--- a/cmd/remoteexec_proxy/main.go
+++ b/cmd/remoteexec_proxy/main.go
@@ -81,6 +81,9 @@
 	traceProjectID = flag.String("trace-project-id", "", "project id for cloud tracing")
 	traceFraction  = flag.Float64("trace-sampling-fraction", 1.0, "sampling fraction for stackdriver trace")
 	traceQPS       = flag.Float64("trace-sampling-qps-limit", 1.0, "sampling qps limit for stackdriver trace")
+
+	redisMaxIdleConns   = flag.Int("redis-max-idle-conns", redis.DefaultMaxIdleConns, "maximum number of idle connections to redis.")
+	redisMaxActiveConns = flag.Int("redis-max-active-conns", redis.DefaultMaxActiveConns, "maximum number of active connections to redis.")
 )
 
 func myEmail(ctx context.Context) string {
@@ -258,6 +261,16 @@
 }
 
 func main() {
+	spanTimeout := remoteexec.DefaultSpanTimeout
+	flag.DurationVar(&spanTimeout.Inventory, "exec-inventory-timeout", spanTimeout.Inventory, "timeout of exec-inventory")
+	flag.DurationVar(&spanTimeout.InputTree, "exec-input-tree-timeout", spanTimeout.InputTree, "timeout of exec-iput-tree")
+	flag.DurationVar(&spanTimeout.Setup, "exec-setup-timeout", spanTimeout.Setup, "timeout of exec-setup")
+	flag.DurationVar(&spanTimeout.CheckCache, "exec-check-cache-timeout", spanTimeout.CheckCache, "timeout of exec-check-cache")
+	flag.DurationVar(&spanTimeout.CheckMissing, "exec-check-missing-timeout", spanTimeout.CheckMissing, "timeout of exec-check-missing")
+	flag.DurationVar(&spanTimeout.UploadBlobs, "exec-upload-blobs-timeout", spanTimeout.UploadBlobs, "timeout of exec-upload-blobs")
+	flag.DurationVar(&spanTimeout.Execute, "exec-execute-timeout", spanTimeout.Execute, "timeout of exec-execute")
+	flag.DurationVar(&spanTimeout.Response, "exec-response-timeout", spanTimeout.Response, "timeout of exec-response")
+
 	flag.Parse()
 	ctx := context.Background()
 
@@ -371,7 +384,7 @@
 	}
 	tlsConfig := &tls.Config{
 		InsecureSkipVerify: *insecureSkipVerify,
-		RootCAs: certPool,
+		RootCAs:            certPool,
 	}
 	opts := []grpc.DialOption{
 		grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)),
@@ -394,13 +407,18 @@
 		logger.Warnf("redis disabled for gomafile-digest: %v", err)
 		digestCache = digest.NewCache(nil, *maxDigestCacheEntries)
 	} else {
-		logger.Infof("redis enabled for gomafile-digest: %v", redisAddr)
-		digestCache = digest.NewCache(redis.NewClient(ctx, redisAddr, "gomafile-digest:"), *maxDigestCacheEntries)
+		logger.Infof("redis enabled for gomafile-digest: %v idle=%d active=%d", redisAddr, *redisMaxIdleConns, *redisMaxActiveConns)
+		digestCache = digest.NewCache(redis.NewClient(ctx, redisAddr, redis.Opts{
+			Prefix:         "gomafile-digest:",
+			MaxIdleConns:   *redisMaxIdleConns,
+			MaxActiveConns: *redisMaxActiveConns,
+		}), *maxDigestCacheEntries)
 	}
 
 	re := &remoteexec.Adapter{
 		InstancePrefix: path.Dir(*remoteInstanceName),
 		ExecTimeout:    15 * time.Minute,
+		SpanTimeout:    spanTimeout,
 		Client: remoteexec.Client{
 			ClientConn: reConn,
 			Retry: rpc.Retry{
diff --git a/command/configmap.go b/command/configmap.go
index eb3df35..1288458 100644
--- a/command/configmap.go
+++ b/command/configmap.go
@@ -516,6 +516,7 @@
 		confs = append(confs, &cmdpb.Config{
 			RemoteexecPlatform: platform,
 			Dimensions:         rc.PlatformRuntimeConfig.Dimensions,
+			Acl:                rc.Acl,
 		})
 	}
 
@@ -768,6 +769,7 @@
 				},
 				CmdDescriptor:      d,
 				RemoteexecPlatform: platform,
+				Acl:                rc.Acl,
 			}
 			return nil
 		})
diff --git a/exec/inventory.go b/exec/inventory.go
index a3d2cd8..fab04f4 100644
--- a/exec/inventory.go
+++ b/exec/inventory.go
@@ -20,6 +20,7 @@
 	"go.opencensus.io/tag"
 	"go.opencensus.io/trace"
 
+	"go.chromium.org/goma/server/auth/enduser"
 	"go.chromium.org/goma/server/command/descriptor"
 	"go.chromium.org/goma/server/command/normalizer"
 	"go.chromium.org/goma/server/log"
@@ -164,6 +165,7 @@
 type platformConfig struct {
 	dimensionSet       map[string]bool
 	remoteexecPlatform *cmdpb.RemoteexecPlatform
+	acl                *cmdpb.ACL
 }
 
 // Configure sets config in the inventory.
@@ -186,6 +188,7 @@
 			newPlatformConfigs = append(newPlatformConfigs, &platformConfig{
 				dimensionSet:       dimensionSet,
 				remoteexecPlatform: cfg.GetRemoteexecPlatform(),
+				acl:                cfg.GetAcl(),
 			})
 			logger.Infof("configure platform config: %v", cfg)
 			continue
@@ -267,6 +270,35 @@
 	return in.versionID, resp
 }
 
+func checkACL(ctx context.Context, acl *cmdpb.ACL) error {
+	if acl == nil {
+		return nil
+	}
+	eu, ok := enduser.FromContext(ctx)
+	if len(acl.DisallowedGroups) > 0 {
+		if !ok {
+			return errors.New("no enduser group in context")
+		}
+		for _, g := range acl.DisallowedGroups {
+			if g == eu.Group {
+				return fmt.Errorf("enduser group %q not allowed (in disallowed groups)", eu.Group)
+			}
+		}
+	}
+	if len(acl.AllowedGroups) > 0 {
+		if !ok {
+			return errors.New("no enduser group in context")
+		}
+		for _, g := range acl.AllowedGroups {
+			if g == eu.Group {
+				return nil
+			}
+		}
+		return fmt.Errorf("enduser group %q not allowed (not in allowed groups)", eu.Group)
+	}
+	return nil
+}
+
 // pickCmd takes selectors of compiler and subprograms, and returns configs of
 // the best cmd_server that has both compiler and subprograms.
 // First, it find out cmd_server that has both selectors of compiler and
@@ -319,6 +351,10 @@
 			logger.Errorf("cfg for %v is not registered. possibly configs broken.", cmdSel)
 			continue
 		}
+		if err := checkACL(ctx, cfg.Acl); err != nil {
+			logger.Errorf("cfg for %v; access denied: %v", cmdSel, err)
+			continue
+		}
 		ccfgs = append(ccfgs, cfg)
 	}
 	if len(ccfgs) == 0 {
@@ -501,6 +537,10 @@
 	// select the first one.
 	var matchedConfig *platformConfig
 	for _, pCfg := range in.platformConfigs {
+		if err := checkACL(ctx, pCfg.acl); err != nil {
+			logger.Errorf("pcfg %v; access denied: %v", pCfg, err)
+			continue
+		}
 		if matchDimensions(dimensions, pCfg.dimensionSet) {
 			matchedConfig = pCfg
 			break
diff --git a/exec/stats.go b/exec/stats.go
index 05bc333..040005a 100644
--- a/exec/stats.go
+++ b/exec/stats.go
@@ -6,11 +6,13 @@
 
 import (
 	"context"
+	"fmt"
 
 	"go.opencensus.io/stats"
 	"go.opencensus.io/stats/view"
 	"go.opencensus.io/tag"
 
+	"go.chromium.org/goma/server/log"
 	gomapb "go.chromium.org/goma/server/proto/api"
 )
 
@@ -19,8 +21,13 @@
 		"go.chromium.org/goma/server/exec.api-error",
 		"exec request api-error",
 		stats.UnitDimensionless)
+	clientRetries = stats.Int64(
+		"go.chromium.org/goma/server/exec.client-retry",
+		"exec request per client retry",
+		stats.UnitDimensionless)
 
-	apiErrorKey = tag.MustNewKey("api-error")
+	apiErrorKey    = tag.MustNewKey("api-error")
+	clientRetryKey = tag.MustNewKey("client-retry")
 
 	// DefaultViews are the default views provided by this package.
 	// You need to register the view for data to actually be collected.
@@ -34,6 +41,14 @@
 			Aggregation: view.Count(),
 		},
 		{
+			Description: "exec request client retry",
+			TagKeys: []tag.Key{
+				clientRetryKey,
+			},
+			Measure:     clientRetries,
+			Aggregation: view.Count(),
+		},
+		{
 			Description: `counts toolchain selection. result is "used", "found", "requested" or "missed"`,
 			TagKeys: []tag.Key{
 				selectorKey,
@@ -45,18 +60,22 @@
 	}
 )
 
-func apiErrorValue(resp *gomapb.ExecResp) string {
+func apiErrorValue(ctx context.Context, resp *gomapb.ExecResp) string {
+	logger := log.FromContext(ctx)
 	if errVal := resp.GetError(); errVal != gomapb.ExecResp_OK {
 		// marked as BAD_REQUEST for
 		// - compiler/subprogram not found
 		// - bad path_type in command config
 		// - input root detection failed
+		logger.Errorf("api-error=%s error_message=%s", errVal, resp.ErrorMessage)
 		return errVal.String()
 	}
 	if len(resp.ErrorMessage) > 0 {
+		logger.Errorf("api-error=internal: error_messge=%s", resp.ErrorMessage)
 		return "internal"
 	}
 	if len(resp.MissingInput) > 0 {
+		logger.Errorf("api-error=missing-inputs: missing=%d", len(resp.MissingInput))
 		return "missing-inputs"
 	}
 	return "OK"
@@ -64,10 +83,17 @@
 
 // RecordAPIError records api-error in resp.
 func RecordAPIError(ctx context.Context, resp *gomapb.ExecResp) error {
-	ctx, err := tag.New(ctx, tag.Upsert(apiErrorKey, apiErrorValue(resp)))
+	ctx, err := tag.New(ctx, tag.Upsert(apiErrorKey, apiErrorValue(ctx, resp)))
 	if err != nil {
 		return err
 	}
 	stats.Record(ctx, apiErrors.M(1))
 	return nil
 }
+
+// RecordRequesterInfo records requester info.
+// e.g. client retry count.
+func RecordRequesterInfo(ctx context.Context, reqInfo *gomapb.RequesterInfo) error {
+	return stats.RecordWithTags(ctx, []tag.Mutator{tag.Upsert(clientRetryKey, fmt.Sprintf("%d", reqInfo.GetRetry()))}, clientRetries.M(1))
+	// TODO: record api version / goma revision etc?
+}
diff --git a/execlog/service.go b/execlog/service.go
index 6ee4ba1..e333f80 100644
--- a/execlog/service.go
+++ b/execlog/service.go
@@ -6,7 +6,13 @@
 
 import (
 	"context"
+	"fmt"
 
+	"go.opencensus.io/stats"
+	"go.opencensus.io/stats/view"
+	"go.opencensus.io/tag"
+
+	"go.chromium.org/goma/server/log"
 	gomapb "go.chromium.org/goma/server/proto/api"
 )
 
@@ -15,12 +21,256 @@
 // grpc's default is 4MB.
 const DefaultMaxReqMsgSize = 10 * 1024 * 1024
 
+var (
+	requests = stats.Int64(
+		"go.chromium.org/goma/execlog/requests",
+		"number of execlog entries",
+		stats.UnitDimensionless)
+
+	osFamilyKey           = tag.MustNewKey("os_family")
+	gomaErrorKey          = tag.MustNewKey("goma_error")
+	compilerProxyErrorKey = tag.MustNewKey("compiler_proxy_error")
+	cacheHitKey           = tag.MustNewKey("cache_hit")
+	depscacheUsedKey      = tag.MustNewKey("depscache_used")
+	localRunKey           = tag.MustNewKey("local_run")
+	execExitStatusKey     = tag.MustNewKey("exec_exit_status")
+	execRequestRetryKey   = tag.MustNewKey("exec_request_retry")
+
+	handlerTime = stats.Float64(
+		"go.chromium.org/goma/execlog/handler_time",
+		"Time in compiler_proxy handler",
+		stats.UnitMilliseconds)
+
+	pendingTime = stats.Float64(
+		"go.chromium.org/goma/execlog/pending_time",
+		"Time in pending queue in compiler_proxy",
+		stats.UnitMilliseconds)
+	// need compiler_info_process_time?
+
+	includeProcessorWaitTime = stats.Float64(
+		"go.chromium.org/goma/execlog/include_processor_wait_time",
+		"Time to wait include processor",
+		stats.UnitMilliseconds)
+	includeProcessorRunTime = stats.Float64(
+		"go.chromium.org/goma/execlog/include_processor_run_time",
+		"Time to run include processor",
+		stats.UnitMilliseconds)
+	includePreprocessTotalFiles = stats.Int64(
+		"go.chromium.org/goma/execlog/include_preprocess_total_files",
+		"Number of files processed in include preprocess",
+		stats.UnitDimensionless)
+
+	includeFileloadPendingTime = stats.Float64(
+		"go.chromium.org/goma/execlog/include_fileload_pending_time",
+		"Time to wait upload input files",
+		stats.UnitMilliseconds)
+	includeFileloadRunTime = stats.Float64(
+		"go.chromium.org/goma/execlog/include_fileload_run_time",
+		"Time to upload input files",
+		stats.UnitMilliseconds)
+
+	rpcThrottleTime = stats.Float64(
+		"go.chromium.org/goma/execlog/rpc_throttle_time",
+		"Time to wait to call Exec by throttling (backoff by error)",
+		stats.UnitMilliseconds)
+	rpcPendingTime = stats.Float64(
+		"go.chromium.org/goma/execlog/rpc_pending_time",
+		"Time to wait to call Exec (too many requests)",
+		stats.UnitMilliseconds)
+	rpcWaitTime = stats.Float64(
+		"go.chromium.org/goma/execlog/rpc_wait_time",
+		"Time to wait Exec call response (i.e. server latency)",
+		stats.UnitMilliseconds)
+
+	fileResponseTime = stats.Float64(
+		"go.chromium.org/goma/execlog/file_response_time",
+		"Time to process output files",
+		stats.UnitMilliseconds)
+
+	localDelayTime = stats.Float64(
+		"go.chromium.org/goma/execlog/local_delay_time",
+		"Time delayed to start run locally",
+		stats.UnitMilliseconds)
+	localPendingTime = stats.Float64(
+		"go.chromium.org/goma/execlog/local_penging_time",
+		"Time to wait to run locally",
+		stats.UnitMilliseconds)
+	localRunTime = stats.Float64(
+		"go.chromium.org/goma/execlog/local_run_time",
+		"Time to run locally",
+		stats.UnitMilliseconds)
+
+	defaultLatencyDistribution = view.Distribution(1, 2, 3, 4, 5, 6, 8, 10, 13, 16, 20, 25, 30, 40, 50, 65, 80, 100, 130, 160, 200, 250, 300, 400, 500, 650, 800, 1000, 2000, 5000, 10000, 20000, 50000, 100000, 200000, 500000)
+
+	tagKeys = []tag.Key{
+		osFamilyKey,
+		cacheHitKey,
+		depscacheUsedKey,
+		localRunKey,
+		execExitStatusKey,
+	}
+
+	DefaultViews = []*view.View{
+		{
+			TagKeys: []tag.Key{
+				osFamilyKey,
+				gomaErrorKey,
+				compilerProxyErrorKey,
+				cacheHitKey,
+				depscacheUsedKey,
+				localRunKey,
+				execExitStatusKey,
+				execRequestRetryKey,
+			},
+			Measure:     requests,
+			Aggregation: view.Sum(),
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     handlerTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     pendingTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     includeProcessorWaitTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     includeProcessorRunTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     includePreprocessTotalFiles,
+			Aggregation: view.Sum(),
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     includeFileloadPendingTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     includeFileloadRunTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     rpcThrottleTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     rpcPendingTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     rpcWaitTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     fileResponseTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     localDelayTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     localPendingTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+		{
+			TagKeys:     tagKeys,
+			Measure:     localRunTime,
+			Aggregation: defaultLatencyDistribution,
+		},
+	}
+)
+
 // Service represents goma execlog service.
 type Service struct {
 }
 
-// SaveLog discards execlog.
+func osFamily(e *gomapb.ExecLog) string {
+	oi := e.GetOsInfo().GetOsInfoOneof()
+	switch oi.(type) {
+	case *gomapb.OSInfo_LinuxInfo_:
+		return "Linux"
+	case *gomapb.OSInfo_WinInfo_:
+		return "Windows"
+	case *gomapb.OSInfo_MacInfo_:
+		return "Mac"
+	default:
+		return "Unknown"
+	}
+}
+
+// SaveLog emits some metrics.
+//  * go.chromium.org/goma/execlog/requests
+//      {os_family, ,goma_error, compiler_proxy_error,
+//       cache_hit, depscache_used, local_run,
+//       exec_exit_status, exec_request_retry}
+//  * go.chromium.org/goma/execlog/handler_time
 // TODO: implement saving logic to GCS?
-func (s Service) SaveLog(ctx context.Context, req *gomapb.SaveLogReq) (*gomapb.SaveLogResp, error) {
+func (Service) SaveLog(ctx context.Context, req *gomapb.SaveLogReq) (*gomapb.SaveLogResp, error) {
+	logger := log.FromContext(ctx)
+	for _, e := range req.GetExecLog() {
+		os := osFamily(e)
+		localRun := e.GetLocalRunTime() > 0
+		tags := []tag.Mutator{
+			tag.Upsert(osFamilyKey, os),
+			tag.Upsert(cacheHitKey, fmt.Sprint(e.GetCacheHit())),
+			tag.Upsert(depscacheUsedKey, fmt.Sprint(e.GetDepscacheUsed())),
+			tag.Upsert(localRunKey, fmt.Sprint(localRun)),
+			tag.Upsert(execExitStatusKey, fmt.Sprint(e.GetExecExitStatus())),
+		}
+		ctx, err := tag.New(ctx, tags...)
+		if err != nil {
+			logger.Errorf("Failed to set tags for savelog: %v", err)
+			continue
+		}
+		stats.RecordWithTags(ctx, []tag.Mutator{
+			tag.Upsert(gomaErrorKey, fmt.Sprint(e.GetGomaError())),
+			tag.Upsert(compilerProxyErrorKey, fmt.Sprint(e.GetCompilerProxyError())),
+			tag.Upsert(execRequestRetryKey, fmt.Sprint(e.GetExecRequestRetry())),
+		}, requests.M(1))
+		stats.Record(ctx, handlerTime.M(float64(e.GetHandlerTime())))
+		stats.Record(ctx, pendingTime.M(float64(e.GetPendingTime())))
+		stats.Record(ctx, includeProcessorWaitTime.M(float64(e.GetIncludeProcessorWaitTime())))
+		stats.Record(ctx, includeProcessorRunTime.M(float64(e.GetIncludeProcessorRunTime())))
+		stats.Record(ctx, includePreprocessTotalFiles.M(int64(e.GetIncludePreprocessTotalFiles())))
+		for _, t := range e.GetIncludeFileloadPendingTime() {
+			stats.Record(ctx, includeFileloadPendingTime.M(float64(t)))
+		}
+		for _, t := range e.GetIncludeFileloadRunTime() {
+			stats.Record(ctx, includeFileloadRunTime.M(float64(t)))
+		}
+		for _, t := range e.GetRpcThrottleTime() {
+			stats.Record(ctx, rpcThrottleTime.M(float64(t)))
+		}
+		for _, t := range e.GetRpcPendingTime() {
+			stats.Record(ctx, rpcPendingTime.M(float64(t)))
+		}
+		for _, t := range e.GetRpcWaitTime() {
+			stats.Record(ctx, rpcWaitTime.M(float64(t)))
+		}
+		stats.Record(ctx, fileResponseTime.M(float64(e.GetFileResponseTime())))
+
+		stats.Record(ctx, localDelayTime.M(float64(e.GetLocalDelayTime())))
+		stats.Record(ctx, localPendingTime.M(float64(e.GetLocalPendingTime())))
+		stats.Record(ctx, localRunTime.M(float64(e.GetLocalRunTime())))
+	}
+
 	return &gomapb.SaveLogResp{}, nil
 }
diff --git a/go.mod b/go.mod
index 039ccba..68ce81e 100644
--- a/go.mod
+++ b/go.mod
@@ -3,29 +3,29 @@
 go 1.12
 
 require (
-	cloud.google.com/go v0.65.0
-	cloud.google.com/go/pubsub v1.6.1
-	cloud.google.com/go/storage v1.11.0
-	contrib.go.opencensus.io/exporter/stackdriver v0.13.4
-	github.com/bazelbuild/remote-apis v0.0.0-20191104140458-e77c4eb2ca48
-	github.com/bazelbuild/remote-apis-sdks v0.0.0-20200717191301-6f048255943e
-	github.com/fsnotify/fsnotify v1.4.7
+	cloud.google.com/go v0.78.0
+	cloud.google.com/go/pubsub v1.10.0
+	cloud.google.com/go/storage v1.13.0
+	contrib.go.opencensus.io/exporter/stackdriver v0.13.5
+	github.com/bazelbuild/remote-apis v0.0.0-20200904140912-1aeb39973178
+	github.com/bazelbuild/remote-apis-sdks v0.0.0-20201118210229-b732553f9d45
+	github.com/fsnotify/fsnotify v1.4.9
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
-	github.com/golang/protobuf v1.4.2
-	github.com/gomodule/redigo v2.0.0+incompatible
-	github.com/google/go-cmp v0.5.2
-	github.com/google/uuid v1.1.2
+	github.com/golang/protobuf v1.4.3
+	github.com/gomodule/redigo v1.8.4
+	github.com/google/go-cmp v0.5.4
+	github.com/google/uuid v1.2.0
 	github.com/googleapis/gax-go/v2 v2.0.5
 	github.com/googleapis/google-cloud-go-testing v0.0.0-20190904031503-2d24dde44ba5
-	github.com/grpc-ecosystem/go-grpc-middleware v1.2.1
-	go.opencensus.io v0.22.4
-	go.uber.org/zap v1.10.0
+	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2
+	go.opencensus.io v0.23.0
+	go.uber.org/zap v1.16.0
 	golang.org/x/build v0.0.0-20191031202223-0706ea4fce0c
-	golang.org/x/net v0.0.0-20200822124328-c89045814202
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
-	google.golang.org/api v0.30.0
-	google.golang.org/genproto v0.0.0-20200827165113-ac2560b5e952
-	google.golang.org/grpc v1.31.1
+	golang.org/x/net v0.0.0-20210119194325-5f4716e94777
+	golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99
+	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+	google.golang.org/api v0.40.0
+	google.golang.org/genproto v0.0.0-20210222152913-aa3ee6e6a81c
+	google.golang.org/grpc v1.36.0
 	google.golang.org/protobuf v1.25.0
 )
diff --git a/go.sum b/go.sum
index 0fbc76a..c40eb21 100644
--- a/go.sum
+++ b/go.sum
@@ -1,74 +1,47 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0 h1:ROfEUZz+Gh5pa62DJWXSaonyu3StP6EA6lPEXPI6mCo=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.44.3 h1:0sMegbmn/8uTwpNkB0q9cLEpZ2W5a6kl+wtBQgPWBJQ=
 cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1 h1:lRi0CHyU+ytlvylOlFKKq0af6JncuyoRh1J+QJBqQx0=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3 h1:AVXDdKsrtX33oR9fbCMu/+c1o8Ofjq6Ku/MInaLVg5Y=
 cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.47.0/go.mod h1:5p3Ky/7f3N10VBkhuR5LFtddroTiMyjZV/Kj5qOQFxU=
 cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0 h1:GGslhk/BU052LPlnI1vpp3fcbUs+hQ3E+Doti/3/vF8=
 cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0 h1:MZQCQQaRwOrAcuKjiHWHrgKykt4fZyuwF2dtiG3fGW8=
 cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0 h1:3ithwDMr7/3vpAMXiH+ZQnYbuIsh+OPhUPMFC9enmn0=
 cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0 h1:WRz29PgAsVEyPSDHyk+0fpEkwEFyfhHn+JbksT6gIL4=
 cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-cloud.google.com/go v0.57.0 h1:EpMNVUorLiZIELdMZbCYX/ByTFCdoYopYAGxaGVz9ms=
 cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
-cloud.google.com/go v0.61.0 h1:NLQf5e1OMspfNT1RAHOB3ublr1TW3YTXO8OiWwVjK2U=
-cloud.google.com/go v0.61.0/go.mod h1:XukKJg4Y7QsUu0Hxg3qQKUWR4VuWivmyMK2+rUyxAqw=
-cloud.google.com/go v0.62.0 h1:RmDygqvj27Zf3fCQjQRtLyC7KwFcHkeJitcO0OoGOcA=
 cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
-cloud.google.com/go v0.64.0/go.mod h1:xfORb36jGvE+6EexW71nMEtL025s3x6xvuYUKM4JLv4=
-cloud.google.com/go v0.65.0 h1:Dg9iHVQfrhq82rUNu9ZxUDrJLaxFUe/HlCVaLyRruq8=
 cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go/bigquery v1.0.1 h1:hL+ycaJpVE9M7nLoiXb/Pn10ENE2u+oddxbD8uu0ZVU=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.75.0/go.mod h1:VGuuCn7PG0dwsd5XPVm2Mm3wlh3EL55/79EKB6hlPTY=
+cloud.google.com/go v0.78.0 h1:oKpsiyKMfVpwR3zSAkQixGzlVE5ovitBuO0qSmCf0bI=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
-cloud.google.com/go/bigquery v1.3.0 h1:sAbMqjY1PEQKZBWfbu6Y6bsupJ9c4QdHnzg/VvYTLcE=
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@@ -80,10 +53,10 @@
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@@ -94,6 +67,8 @@
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@@ -114,11 +89,14 @@
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@@ -134,49 +112,36 @@
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@@ -257,7 +210,6 @@
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@@ -334,19 +285,13 @@
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@@ -358,17 +303,14 @@
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@@ -376,10 +318,11 @@
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@@ -391,66 +334,59 @@
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 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3 h1:sXmLre5bzIR6ypkjXCDI3jHPssRhc8KD/Ome589sc3U=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4 h1:UoveltGrhghAA7ePc+e+QYDHXrBps2PqFZiHkGR/xK8=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
diff --git a/httprpc/server.go b/httprpc/server.go
index 6372086..87f22cd 100644
--- a/httprpc/server.go
+++ b/httprpc/server.go
@@ -341,10 +341,10 @@
 		// assume most call needs less than 1 minute (both exec,
 		// file access),
 		// according to API metrics, 99%ile of Execute API latency
-		// was 33.225 seconds (as of May 15, 2019).
+		// was ~45 seconds (as of Nov 19, 2020).
 		// only a few exec call may need longer timeout.
 		// see below if status.Code(err) == codes.DeadlineExceeded case.
-		timeouts := []time.Duration{40 * time.Second, 1 * time.Minute, 3 * time.Minute, 5 * time.Minute}
+		timeouts := []time.Duration{50 * time.Second, 90 * time.Second, 3 * time.Minute, 5 * time.Minute}
 		var resp proto.Message
 		authOK := false
 		err = opt.retry.Do(ctx, func() error {
diff --git a/proto/api/goma_data.pb.go b/proto/api/goma_data.pb.go
index 404d7dc..f7e857c 100644
--- a/proto/api/goma_data.pb.go
+++ b/proto/api/goma_data.pb.go
@@ -7,16 +7,16 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: api/goma_data.proto
 
 package api
 
 import (
 	proto "github.com/golang/protobuf/proto"
-	timestamp "github.com/golang/protobuf/ptypes/timestamp"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -162,7 +162,7 @@
 
 // Deprecated: Use RequesterInfo_GomaApiVersion.Descriptor instead.
 func (RequesterInfo_GomaApiVersion) EnumDescriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{5, 0}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{6, 0}
 }
 
 // Implementation Note: `WINDOWS` is defined on Win, so we have to add
@@ -223,7 +223,7 @@
 
 // Deprecated: Use RequesterInfo_PathStyle.Descriptor instead.
 func (RequesterInfo_PathStyle) EnumDescriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{5, 1}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{6, 1}
 }
 
 type ExecReq_CachePolicy int32
@@ -286,7 +286,7 @@
 
 // Deprecated: Use ExecReq_CachePolicy.Descriptor instead.
 func (ExecReq_CachePolicy) EnumDescriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{7, 0}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{8, 0}
 }
 
 type ExecResp_ExecError int32
@@ -342,7 +342,7 @@
 
 // Deprecated: Use ExecResp_ExecError.Descriptor instead.
 func (ExecResp_ExecError) EnumDescriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{9, 0}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{10, 0}
 }
 
 // Specifies the reason of ExecError::BAD_REQUEST.
@@ -401,7 +401,7 @@
 
 // Deprecated: Use ExecResp_BadRequestReasonCode.Descriptor instead.
 func (ExecResp_BadRequestReasonCode) EnumDescriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{9, 1}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{10, 1}
 }
 
 type ExecResp_CacheSource int32
@@ -463,7 +463,7 @@
 
 // Deprecated: Use ExecResp_CacheSource.Descriptor instead.
 func (ExecResp_CacheSource) EnumDescriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{9, 2}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{10, 2}
 }
 
 // hash_key = sha256(serialized FileBlob)
@@ -977,7 +977,62 @@
 	return nil
 }
 
-// NEXT ID TO USE: 12
+type PlatformProperty struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Name  *string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	Value *string `protobuf:"bytes,2,opt,name=value" json:"value,omitempty"`
+}
+
+func (x *PlatformProperty) Reset() {
+	*x = PlatformProperty{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_api_goma_data_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PlatformProperty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PlatformProperty) ProtoMessage() {}
+
+func (x *PlatformProperty) ProtoReflect() protoreflect.Message {
+	mi := &file_api_goma_data_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PlatformProperty.ProtoReflect.Descriptor instead.
+func (*PlatformProperty) Descriptor() ([]byte, []int) {
+	return file_api_goma_data_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *PlatformProperty) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *PlatformProperty) GetValue() string {
+	if x != nil && x.Value != nil {
+		return *x.Value
+	}
+	return ""
+}
+
+// NEXT ID TO USE: 14
 type RequesterInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1009,6 +1064,12 @@
 	Dimensions []string `protobuf:"bytes,10,rep,name=dimensions" json:"dimensions,omitempty"`
 	// Requester's path style.
 	PathStyle *RequesterInfo_PathStyle `protobuf:"varint,11,opt,name=path_style,json=pathStyle,enum=devtools_goma.RequesterInfo_PathStyle" json:"path_style,omitempty"`
+	// re-client compat flags
+	// The exec root of the command.
+	ExecRoot *string `protobuf:"bytes,12,opt,name=exec_root,json=execRoot" json:"exec_root,omitempty"`
+	// This is used to identify remote platform settings like the docker image
+	// to use to run the command.
+	PlatformProperties []*PlatformProperty `protobuf:"bytes,13,rep,name=platform_properties,json=platformProperties" json:"platform_properties,omitempty"`
 }
 
 // Default values for RequesterInfo fields.
@@ -1019,7 +1080,7 @@
 func (x *RequesterInfo) Reset() {
 	*x = RequesterInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[5]
+		mi := &file_api_goma_data_proto_msgTypes[6]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1032,7 +1093,7 @@
 func (*RequesterInfo) ProtoMessage() {}
 
 func (x *RequesterInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[5]
+	mi := &file_api_goma_data_proto_msgTypes[6]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1045,7 +1106,7 @@
 
 // Deprecated: Use RequesterInfo.ProtoReflect.Descriptor instead.
 func (*RequesterInfo) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{5}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{6}
 }
 
 func (x *RequesterInfo) GetAddr() string {
@@ -1118,6 +1179,20 @@
 	return RequesterInfo_UNKNOWN_STYLE
 }
 
+func (x *RequesterInfo) GetExecRoot() string {
+	if x != nil && x.ExecRoot != nil {
+		return *x.ExecRoot
+	}
+	return ""
+}
+
+func (x *RequesterInfo) GetPlatformProperties() []*PlatformProperty {
+	if x != nil {
+		return x.PlatformProperties
+	}
+	return nil
+}
+
 type RequesterEnv struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1136,7 +1211,7 @@
 func (x *RequesterEnv) Reset() {
 	*x = RequesterEnv{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[6]
+		mi := &file_api_goma_data_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1149,7 +1224,7 @@
 func (*RequesterEnv) ProtoMessage() {}
 
 func (x *RequesterEnv) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[6]
+	mi := &file_api_goma_data_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1162,7 +1237,7 @@
 
 // Deprecated: Use RequesterEnv.ProtoReflect.Descriptor instead.
 func (*RequesterEnv) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{6}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *RequesterEnv) GetGomaccPath() string {
@@ -1296,7 +1371,7 @@
 func (x *ExecReq) Reset() {
 	*x = ExecReq{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[7]
+		mi := &file_api_goma_data_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1309,7 +1384,7 @@
 func (*ExecReq) ProtoMessage() {}
 
 func (x *ExecReq) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[7]
+	mi := &file_api_goma_data_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1322,7 +1397,7 @@
 
 // Deprecated: Use ExecReq.ProtoReflect.Descriptor instead.
 func (*ExecReq) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{7}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *ExecReq) GetCommandSpec() *CommandSpec {
@@ -1445,15 +1520,15 @@
 	unknownFields protoimpl.UnknownFields
 
 	// When the worker started executing the action command.
-	ExecutionStartTimestamp *timestamp.Timestamp `protobuf:"bytes,1,opt,name=execution_start_timestamp,json=executionStartTimestamp" json:"execution_start_timestamp,omitempty"`
+	ExecutionStartTimestamp *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=execution_start_timestamp,json=executionStartTimestamp" json:"execution_start_timestamp,omitempty"`
 	// When the worker completed executing the action command.
-	ExecutionCompletedTimestamp *timestamp.Timestamp `protobuf:"bytes,2,opt,name=execution_completed_timestamp,json=executionCompletedTimestamp" json:"execution_completed_timestamp,omitempty"`
+	ExecutionCompletedTimestamp *timestamppb.Timestamp `protobuf:"bytes,2,opt,name=execution_completed_timestamp,json=executionCompletedTimestamp" json:"execution_completed_timestamp,omitempty"`
 }
 
 func (x *ExecutionStats) Reset() {
 	*x = ExecutionStats{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[8]
+		mi := &file_api_goma_data_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1466,7 +1541,7 @@
 func (*ExecutionStats) ProtoMessage() {}
 
 func (x *ExecutionStats) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[8]
+	mi := &file_api_goma_data_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1479,17 +1554,17 @@
 
 // Deprecated: Use ExecutionStats.ProtoReflect.Descriptor instead.
 func (*ExecutionStats) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{8}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{9}
 }
 
-func (x *ExecutionStats) GetExecutionStartTimestamp() *timestamp.Timestamp {
+func (x *ExecutionStats) GetExecutionStartTimestamp() *timestamppb.Timestamp {
 	if x != nil {
 		return x.ExecutionStartTimestamp
 	}
 	return nil
 }
 
-func (x *ExecutionStats) GetExecutionCompletedTimestamp() *timestamp.Timestamp {
+func (x *ExecutionStats) GetExecutionCompletedTimestamp() *timestamppb.Timestamp {
 	if x != nil {
 		return x.ExecutionCompletedTimestamp
 	}
@@ -1554,7 +1629,7 @@
 func (x *ExecResp) Reset() {
 	*x = ExecResp{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[9]
+		mi := &file_api_goma_data_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1567,7 +1642,7 @@
 func (*ExecResp) ProtoMessage() {}
 
 func (x *ExecResp) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[9]
+	mi := &file_api_goma_data_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1580,7 +1655,7 @@
 
 // Deprecated: Use ExecResp.ProtoReflect.Descriptor instead.
 func (*ExecResp) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{9}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *ExecResp) GetResult() *ExecResult {
@@ -1826,7 +1901,7 @@
 func (x *StoreFileReq) Reset() {
 	*x = StoreFileReq{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[10]
+		mi := &file_api_goma_data_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1839,7 +1914,7 @@
 func (*StoreFileReq) ProtoMessage() {}
 
 func (x *StoreFileReq) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[10]
+	mi := &file_api_goma_data_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1852,7 +1927,7 @@
 
 // Deprecated: Use StoreFileReq.ProtoReflect.Descriptor instead.
 func (*StoreFileReq) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{10}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *StoreFileReq) GetBlob() []*FileBlob {
@@ -1880,7 +1955,7 @@
 func (x *StoreFileResp) Reset() {
 	*x = StoreFileResp{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[11]
+		mi := &file_api_goma_data_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1893,7 +1968,7 @@
 func (*StoreFileResp) ProtoMessage() {}
 
 func (x *StoreFileResp) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[11]
+	mi := &file_api_goma_data_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1906,7 +1981,7 @@
 
 // Deprecated: Use StoreFileResp.ProtoReflect.Descriptor instead.
 func (*StoreFileResp) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{11}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *StoreFileResp) GetHashKey() []string {
@@ -1928,7 +2003,7 @@
 func (x *LookupFileReq) Reset() {
 	*x = LookupFileReq{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[12]
+		mi := &file_api_goma_data_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1941,7 +2016,7 @@
 func (*LookupFileReq) ProtoMessage() {}
 
 func (x *LookupFileReq) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[12]
+	mi := &file_api_goma_data_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1954,7 +2029,7 @@
 
 // Deprecated: Use LookupFileReq.ProtoReflect.Descriptor instead.
 func (*LookupFileReq) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{12}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *LookupFileReq) GetHashKey() []string {
@@ -1982,7 +2057,7 @@
 func (x *LookupFileResp) Reset() {
 	*x = LookupFileResp{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[13]
+		mi := &file_api_goma_data_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1995,7 +2070,7 @@
 func (*LookupFileResp) ProtoMessage() {}
 
 func (x *LookupFileResp) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[13]
+	mi := &file_api_goma_data_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2008,7 +2083,7 @@
 
 // Deprecated: Use LookupFileResp.ProtoReflect.Descriptor instead.
 func (*LookupFileResp) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{13}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *LookupFileResp) GetBlob() []*FileBlob {
@@ -2027,7 +2102,7 @@
 func (x *EmptyMessage) Reset() {
 	*x = EmptyMessage{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[14]
+		mi := &file_api_goma_data_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2040,7 +2115,7 @@
 func (*EmptyMessage) ProtoMessage() {}
 
 func (x *EmptyMessage) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[14]
+	mi := &file_api_goma_data_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2053,7 +2128,7 @@
 
 // Deprecated: Use EmptyMessage.ProtoReflect.Descriptor instead.
 func (*EmptyMessage) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{14}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{15}
 }
 
 type HttpPortResponse struct {
@@ -2067,7 +2142,7 @@
 func (x *HttpPortResponse) Reset() {
 	*x = HttpPortResponse{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[15]
+		mi := &file_api_goma_data_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2080,7 +2155,7 @@
 func (*HttpPortResponse) ProtoMessage() {}
 
 func (x *HttpPortResponse) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[15]
+	mi := &file_api_goma_data_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2093,7 +2168,7 @@
 
 // Deprecated: Use HttpPortResponse.ProtoReflect.Descriptor instead.
 func (*HttpPortResponse) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{15}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *HttpPortResponse) GetPort() int32 {
@@ -2123,7 +2198,7 @@
 func (x *ExecResult_Output) Reset() {
 	*x = ExecResult_Output{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[16]
+		mi := &file_api_goma_data_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2136,7 +2211,7 @@
 func (*ExecResult_Output) ProtoMessage() {}
 
 func (x *ExecResult_Output) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[16]
+	mi := &file_api_goma_data_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2186,7 +2261,7 @@
 func (x *ExecReq_Input) Reset() {
 	*x = ExecReq_Input{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_api_goma_data_proto_msgTypes[17]
+		mi := &file_api_goma_data_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2199,7 +2274,7 @@
 func (*ExecReq_Input) ProtoMessage() {}
 
 func (x *ExecReq_Input) ProtoReflect() protoreflect.Message {
-	mi := &file_api_goma_data_proto_msgTypes[17]
+	mi := &file_api_goma_data_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2212,7 +2287,7 @@
 
 // Deprecated: Use ExecReq_Input.ProtoReflect.Descriptor instead.
 func (*ExecReq_Input) Descriptor() ([]byte, []int) {
-	return file_api_goma_data_proto_rawDescGZIP(), []int{7, 0}
+	return file_api_goma_data_proto_rawDescGZIP(), []int{8, 0}
 }
 
 func (x *ExecReq_Input) GetFilename() string {
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 }
 
 var (
@@ -2651,7 +2737,7 @@
 }
 
 var file_api_goma_data_proto_enumTypes = make([]protoimpl.EnumInfo, 7)
-var file_api_goma_data_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
+var file_api_goma_data_proto_msgTypes = make([]protoimpl.MessageInfo, 19)
 var file_api_goma_data_proto_goTypes = []interface{}{
 	(FileBlob_BlobType)(0),             // 0: devtools_goma.FileBlob.BlobType
 	(RequesterInfo_GomaApiVersion)(0),  // 1: devtools_goma.RequesterInfo.GomaApiVersion
@@ -2665,52 +2751,54 @@
 	(*SubprogramSpec)(nil),             // 9: devtools_goma.SubprogramSpec
 	(*ToolchainSpec)(nil),              // 10: devtools_goma.ToolchainSpec
 	(*ExecResult)(nil),                 // 11: devtools_goma.ExecResult
-	(*RequesterInfo)(nil),              // 12: devtools_goma.RequesterInfo
-	(*RequesterEnv)(nil),               // 13: devtools_goma.RequesterEnv
-	(*ExecReq)(nil),                    // 14: devtools_goma.ExecReq
-	(*ExecutionStats)(nil),             // 15: devtools_goma.ExecutionStats
-	(*ExecResp)(nil),                   // 16: devtools_goma.ExecResp
-	(*StoreFileReq)(nil),               // 17: devtools_goma.StoreFileReq
-	(*StoreFileResp)(nil),              // 18: devtools_goma.StoreFileResp
-	(*LookupFileReq)(nil),              // 19: devtools_goma.LookupFileReq
-	(*LookupFileResp)(nil),             // 20: devtools_goma.LookupFileResp
-	(*EmptyMessage)(nil),               // 21: devtools_goma.EmptyMessage
-	(*HttpPortResponse)(nil),           // 22: devtools_goma.HttpPortResponse
-	(*ExecResult_Output)(nil),          // 23: devtools_goma.ExecResult.Output
-	(*ExecReq_Input)(nil),              // 24: devtools_goma.ExecReq.Input
-	(*timestamp.Timestamp)(nil),        // 25: google.protobuf.Timestamp
+	(*PlatformProperty)(nil),           // 12: devtools_goma.PlatformProperty
+	(*RequesterInfo)(nil),              // 13: devtools_goma.RequesterInfo
+	(*RequesterEnv)(nil),               // 14: devtools_goma.RequesterEnv
+	(*ExecReq)(nil),                    // 15: devtools_goma.ExecReq
+	(*ExecutionStats)(nil),             // 16: devtools_goma.ExecutionStats
+	(*ExecResp)(nil),                   // 17: devtools_goma.ExecResp
+	(*StoreFileReq)(nil),               // 18: devtools_goma.StoreFileReq
+	(*StoreFileResp)(nil),              // 19: devtools_goma.StoreFileResp
+	(*LookupFileReq)(nil),              // 20: devtools_goma.LookupFileReq
+	(*LookupFileResp)(nil),             // 21: devtools_goma.LookupFileResp
+	(*EmptyMessage)(nil),               // 22: devtools_goma.EmptyMessage
+	(*HttpPortResponse)(nil),           // 23: devtools_goma.HttpPortResponse
+	(*ExecResult_Output)(nil),          // 24: devtools_goma.ExecResult.Output
+	(*ExecReq_Input)(nil),              // 25: devtools_goma.ExecReq.Input
+	(*timestamppb.Timestamp)(nil),      // 26: google.protobuf.Timestamp
 }
 var file_api_goma_data_proto_depIdxs = []int32{
 	0,  // 0: devtools_goma.FileBlob.blob_type:type_name -> devtools_goma.FileBlob.BlobType
 	8,  // 1: devtools_goma.ExecResult.command_spec:type_name -> devtools_goma.CommandSpec
 	9,  // 2: devtools_goma.ExecResult.subprogram:type_name -> devtools_goma.SubprogramSpec
-	23, // 3: devtools_goma.ExecResult.output:type_name -> devtools_goma.ExecResult.Output
+	24, // 3: devtools_goma.ExecResult.output:type_name -> devtools_goma.ExecResult.Output
 	2,  // 4: devtools_goma.RequesterInfo.path_style:type_name -> devtools_goma.RequesterInfo.PathStyle
-	8,  // 5: devtools_goma.ExecReq.command_spec:type_name -> devtools_goma.CommandSpec
-	24, // 6: devtools_goma.ExecReq.input:type_name -> devtools_goma.ExecReq.Input
-	9,  // 7: devtools_goma.ExecReq.subprogram:type_name -> devtools_goma.SubprogramSpec
-	12, // 8: devtools_goma.ExecReq.requester_info:type_name -> devtools_goma.RequesterInfo
-	3,  // 9: devtools_goma.ExecReq.cache_policy:type_name -> devtools_goma.ExecReq.CachePolicy
-	13, // 10: devtools_goma.ExecReq.requester_env:type_name -> devtools_goma.RequesterEnv
-	10, // 11: devtools_goma.ExecReq.toolchain_specs:type_name -> devtools_goma.ToolchainSpec
-	25, // 12: devtools_goma.ExecutionStats.execution_start_timestamp:type_name -> google.protobuf.Timestamp
-	25, // 13: devtools_goma.ExecutionStats.execution_completed_timestamp:type_name -> google.protobuf.Timestamp
-	11, // 14: devtools_goma.ExecResp.result:type_name -> devtools_goma.ExecResult
-	4,  // 15: devtools_goma.ExecResp.error:type_name -> devtools_goma.ExecResp.ExecError
-	5,  // 16: devtools_goma.ExecResp.bad_request_reason_code:type_name -> devtools_goma.ExecResp.BadRequestReasonCode
-	6,  // 17: devtools_goma.ExecResp.cache_hit:type_name -> devtools_goma.ExecResp.CacheSource
-	15, // 18: devtools_goma.ExecResp.execution_stats:type_name -> devtools_goma.ExecutionStats
-	7,  // 19: devtools_goma.StoreFileReq.blob:type_name -> devtools_goma.FileBlob
-	12, // 20: devtools_goma.StoreFileReq.requester_info:type_name -> devtools_goma.RequesterInfo
-	12, // 21: devtools_goma.LookupFileReq.requester_info:type_name -> devtools_goma.RequesterInfo
-	7,  // 22: devtools_goma.LookupFileResp.blob:type_name -> devtools_goma.FileBlob
-	7,  // 23: devtools_goma.ExecResult.Output.blob:type_name -> devtools_goma.FileBlob
-	7,  // 24: devtools_goma.ExecReq.Input.content:type_name -> devtools_goma.FileBlob
-	25, // [25:25] is the sub-list for method output_type
-	25, // [25:25] is the sub-list for method input_type
-	25, // [25:25] is the sub-list for extension type_name
-	25, // [25:25] is the sub-list for extension extendee
-	0,  // [0:25] is the sub-list for field type_name
+	12, // 5: devtools_goma.RequesterInfo.platform_properties:type_name -> devtools_goma.PlatformProperty
+	8,  // 6: devtools_goma.ExecReq.command_spec:type_name -> devtools_goma.CommandSpec
+	25, // 7: devtools_goma.ExecReq.input:type_name -> devtools_goma.ExecReq.Input
+	9,  // 8: devtools_goma.ExecReq.subprogram:type_name -> devtools_goma.SubprogramSpec
+	13, // 9: devtools_goma.ExecReq.requester_info:type_name -> devtools_goma.RequesterInfo
+	3,  // 10: devtools_goma.ExecReq.cache_policy:type_name -> devtools_goma.ExecReq.CachePolicy
+	14, // 11: devtools_goma.ExecReq.requester_env:type_name -> devtools_goma.RequesterEnv
+	10, // 12: devtools_goma.ExecReq.toolchain_specs:type_name -> devtools_goma.ToolchainSpec
+	26, // 13: devtools_goma.ExecutionStats.execution_start_timestamp:type_name -> google.protobuf.Timestamp
+	26, // 14: devtools_goma.ExecutionStats.execution_completed_timestamp:type_name -> google.protobuf.Timestamp
+	11, // 15: devtools_goma.ExecResp.result:type_name -> devtools_goma.ExecResult
+	4,  // 16: devtools_goma.ExecResp.error:type_name -> devtools_goma.ExecResp.ExecError
+	5,  // 17: devtools_goma.ExecResp.bad_request_reason_code:type_name -> devtools_goma.ExecResp.BadRequestReasonCode
+	6,  // 18: devtools_goma.ExecResp.cache_hit:type_name -> devtools_goma.ExecResp.CacheSource
+	16, // 19: devtools_goma.ExecResp.execution_stats:type_name -> devtools_goma.ExecutionStats
+	7,  // 20: devtools_goma.StoreFileReq.blob:type_name -> devtools_goma.FileBlob
+	13, // 21: devtools_goma.StoreFileReq.requester_info:type_name -> devtools_goma.RequesterInfo
+	13, // 22: devtools_goma.LookupFileReq.requester_info:type_name -> devtools_goma.RequesterInfo
+	7,  // 23: devtools_goma.LookupFileResp.blob:type_name -> devtools_goma.FileBlob
+	7,  // 24: devtools_goma.ExecResult.Output.blob:type_name -> devtools_goma.FileBlob
+	7,  // 25: devtools_goma.ExecReq.Input.content:type_name -> devtools_goma.FileBlob
+	26, // [26:26] is the sub-list for method output_type
+	26, // [26:26] is the sub-list for method input_type
+	26, // [26:26] is the sub-list for extension type_name
+	26, // [26:26] is the sub-list for extension extendee
+	0,  // [0:26] is the sub-list for field type_name
 }
 
 func init() { file_api_goma_data_proto_init() }
@@ -2780,7 +2868,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RequesterInfo); i {
+			switch v := v.(*PlatformProperty); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2792,7 +2880,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RequesterEnv); i {
+			switch v := v.(*RequesterInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2804,7 +2892,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ExecReq); i {
+			switch v := v.(*RequesterEnv); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2816,7 +2904,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ExecutionStats); i {
+			switch v := v.(*ExecReq); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2828,7 +2916,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ExecResp); i {
+			switch v := v.(*ExecutionStats); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2840,7 +2928,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StoreFileReq); i {
+			switch v := v.(*ExecResp); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2852,7 +2940,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StoreFileResp); i {
+			switch v := v.(*StoreFileReq); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2864,7 +2952,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LookupFileReq); i {
+			switch v := v.(*StoreFileResp); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2876,7 +2964,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*LookupFileResp); i {
+			switch v := v.(*LookupFileReq); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2888,7 +2976,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*EmptyMessage); i {
+			switch v := v.(*LookupFileResp); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2900,7 +2988,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*HttpPortResponse); i {
+			switch v := v.(*EmptyMessage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2912,7 +3000,7 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ExecResult_Output); i {
+			switch v := v.(*HttpPortResponse); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2924,6 +3012,18 @@
 			}
 		}
 		file_api_goma_data_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ExecResult_Output); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_api_goma_data_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*ExecReq_Input); i {
 			case 0:
 				return &v.state
@@ -2942,7 +3042,7 @@
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_api_goma_data_proto_rawDesc,
 			NumEnums:      7,
-			NumMessages:   18,
+			NumMessages:   19,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/proto/api/goma_data.proto b/proto/api/goma_data.proto
index 594fd68..d80dd00 100644
--- a/proto/api/goma_data.proto
+++ b/proto/api/goma_data.proto
@@ -144,7 +144,12 @@
 
 // Common RPC message
 
-// NEXT ID TO USE: 12
+message PlatformProperty {
+  optional string name = 1;
+  optional string value = 2;
+}
+
+// NEXT ID TO USE: 14
 message RequesterInfo {
   optional string addr = 1;  // requester's ip addr.
   optional string username = 2;  // requester's user name
@@ -205,6 +210,14 @@
   }
   // Requester's path style.
   optional PathStyle path_style = 11;
+
+  // re-client compat flags
+  // The exec root of the command.
+  optional string exec_root = 12;
+  // This is used to identify remote platform settings like the docker image
+  // to use to run the command.
+  repeated PlatformProperty platform_properties = 13;
+
 }
 
 message RequesterEnv {
diff --git a/proto/api/goma_log.pb.go b/proto/api/goma_log.pb.go
index 9263527..8a4e5cd 100644
--- a/proto/api/goma_log.pb.go
+++ b/proto/api/goma_log.pb.go
@@ -8,7 +8,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: api/goma_log.proto
 
 package api
diff --git a/proto/auth/acl.pb.go b/proto/auth/acl.pb.go
index 73480aa..1d1f0e1 100644
--- a/proto/auth/acl.pb.go
+++ b/proto/auth/acl.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: auth/acl.proto
 
 package auth
diff --git a/proto/auth/auth.pb.go b/proto/auth/auth.pb.go
index 75f81c7..6e8804b 100644
--- a/proto/auth/auth.pb.go
+++ b/proto/auth/auth.pb.go
@@ -5,16 +5,16 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: auth/auth.proto
 
 package auth
 
 import (
 	proto "github.com/golang/protobuf/proto"
-	timestamp "github.com/golang/protobuf/ptypes/timestamp"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -137,8 +137,8 @@
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Email     string               `protobuf:"bytes,1,opt,name=email,proto3" json:"email,omitempty"`
-	ExpiresAt *timestamp.Timestamp `protobuf:"bytes,3,opt,name=expires_at,json=expiresAt,proto3" json:"expires_at,omitempty"`
+	Email     string                 `protobuf:"bytes,1,opt,name=email,proto3" json:"email,omitempty"`
+	ExpiresAt *timestamppb.Timestamp `protobuf:"bytes,3,opt,name=expires_at,json=expiresAt,proto3" json:"expires_at,omitempty"`
 	// number of requests allowed until expire.
 	// -1 means unlimited. 0 means disallow.
 	Quota int32 `protobuf:"varint,4,opt,name=quota,proto3" json:"quota,omitempty"` // TODO: group quota?
@@ -188,7 +188,7 @@
 	return ""
 }
 
-func (x *AuthResp) GetExpiresAt() *timestamp.Timestamp {
+func (x *AuthResp) GetExpiresAt() *timestamppb.Timestamp {
 	if x != nil {
 		return x.ExpiresAt
 	}
@@ -271,10 +271,10 @@
 
 var file_auth_auth_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
 var file_auth_auth_proto_goTypes = []interface{}{
-	(*AuthReq)(nil),             // 0: auth.AuthReq
-	(*Token)(nil),               // 1: auth.Token
-	(*AuthResp)(nil),            // 2: auth.AuthResp
-	(*timestamp.Timestamp)(nil), // 3: google.protobuf.Timestamp
+	(*AuthReq)(nil),               // 0: auth.AuthReq
+	(*Token)(nil),                 // 1: auth.Token
+	(*AuthResp)(nil),              // 2: auth.AuthResp
+	(*timestamppb.Timestamp)(nil), // 3: google.protobuf.Timestamp
 }
 var file_auth_auth_proto_depIdxs = []int32{
 	3, // 0: auth.AuthResp.expires_at:type_name -> google.protobuf.Timestamp
diff --git a/proto/auth/auth_service.pb.go b/proto/auth/auth_service.pb.go
index ee7fa5d..cb5dd05 100644
--- a/proto/auth/auth_service.pb.go
+++ b/proto/auth/auth_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: auth/auth_service.proto
 
 package auth
diff --git a/proto/auth/authdb.pb.go b/proto/auth/authdb.pb.go
index 4b369ea..dde45e8 100644
--- a/proto/auth/authdb.pb.go
+++ b/proto/auth/authdb.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: auth/authdb.proto
 
 package auth
diff --git a/proto/auth/authdb_service.pb.go b/proto/auth/authdb_service.pb.go
index a7b344c..48ac168 100644
--- a/proto/auth/authdb_service.pb.go
+++ b/proto/auth/authdb_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: auth/authdb_service.proto
 
 package auth
diff --git a/proto/backend/backend.pb.go b/proto/backend/backend.pb.go
index b97c089..25d6f4a 100644
--- a/proto/backend/backend.pb.go
+++ b/proto/backend/backend.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: backend/backend.proto
 
 package backend
diff --git a/proto/cache/cache.pb.go b/proto/cache/cache.pb.go
index ac23b16..8f48176 100644
--- a/proto/cache/cache.pb.go
+++ b/proto/cache/cache.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: cache/cache.proto
 
 package cache
diff --git a/proto/cache/cache_service.pb.go b/proto/cache/cache_service.pb.go
index 675ae8e..dc188dc 100644
--- a/proto/cache/cache_service.pb.go
+++ b/proto/cache/cache_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: cache/cache_service.proto
 
 package cache
diff --git a/proto/command/command.pb.go b/proto/command/command.pb.go
index 1254847..dd7555d 100644
--- a/proto/command/command.pb.go
+++ b/proto/command/command.pb.go
@@ -5,17 +5,17 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: command/command.proto
 
 package command
 
 import (
 	proto "github.com/golang/protobuf/proto"
-	timestamp "github.com/golang/protobuf/ptypes/timestamp"
 	api "go.chromium.org/goma/server/proto/api"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -330,7 +330,7 @@
 	// current working directory of toolchain build.
 	Directory string `protobuf:"bytes,4,opt,name=directory,proto3" json:"directory,omitempty"`
 	// when this toolchain was built.
-	Timestamp *timestamp.Timestamp `protobuf:"bytes,5,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	Timestamp *timestamppb.Timestamp `protobuf:"bytes,5,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
 	// full image name of cmd_server container.
 	CmdServer string `protobuf:"bytes,7,opt,name=cmd_server,json=cmdServer,proto3" json:"cmd_server,omitempty"`
 	// full qualified toolchain name (separated by space)
@@ -390,7 +390,7 @@
 	return ""
 }
 
-func (x *BuildInfo) GetTimestamp() *timestamp.Timestamp {
+func (x *BuildInfo) GetTimestamp() *timestamppb.Timestamp {
 	if x != nil {
 		return x.Timestamp
 	}
@@ -565,6 +565,7 @@
 	// If this config is configured for arbitrary toolchain support,
 	// set dimensions of the config. Otherwise, this should be nil.
 	Dimensions []string `protobuf:"bytes,6,rep,name=dimensions,proto3" json:"dimensions,omitempty"`
+	Acl        *ACL     `protobuf:"bytes,7,opt,name=acl,proto3" json:"acl,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -634,6 +635,77 @@
 	return nil
 }
 
+func (x *Config) GetAcl() *ACL {
+	if x != nil {
+		return x.Acl
+	}
+	return nil
+}
+
+// ACL is access control list for requester.
+type ACL struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Groups that is allowed to use.
+	// If allowed_groups specified, only groups in allowed_groups are
+	// allowed, and other groups are disallowed.
+	// If no allowed_groups specified, any groups are allowed
+	// if it is not disallowed by disallowed_groups.
+	AllowedGroups []string `protobuf:"bytes,1,rep,name=allowed_groups,json=allowedGroups,proto3" json:"allowed_groups,omitempty"`
+	// Groups that is not allowed to use.
+	// If no disallowed_groups specified, only allowed_groups is allowed to use.
+	// If both are not specified, any groups are alllowed.
+	DisallowedGroups []string `protobuf:"bytes,2,rep,name=disallowed_groups,json=disallowedGroups,proto3" json:"disallowed_groups,omitempty"`
+}
+
+func (x *ACL) Reset() {
+	*x = ACL{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_command_command_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ACL) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ACL) ProtoMessage() {}
+
+func (x *ACL) ProtoReflect() protoreflect.Message {
+	mi := &file_command_command_proto_msgTypes[7]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ACL.ProtoReflect.Descriptor instead.
+func (*ACL) Descriptor() ([]byte, []int) {
+	return file_command_command_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *ACL) GetAllowedGroups() []string {
+	if x != nil {
+		return x.AllowedGroups
+	}
+	return nil
+}
+
+func (x *ACL) GetDisallowedGroups() []string {
+	if x != nil {
+		return x.DisallowedGroups
+	}
+	return nil
+}
+
 // Platform is a set of requirements, such as haredware, operting system
 // for RBE backend.
 // matched with build.bazel.remote.execution.v2.Platform.
@@ -648,7 +720,7 @@
 func (x *Platform) Reset() {
 	*x = Platform{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[7]
+		mi := &file_command_command_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -661,7 +733,7 @@
 func (*Platform) ProtoMessage() {}
 
 func (x *Platform) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[7]
+	mi := &file_command_command_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -674,7 +746,7 @@
 
 // Deprecated: Use Platform.ProtoReflect.Descriptor instead.
 func (*Platform) Descriptor() ([]byte, []int) {
-	return file_command_command_proto_rawDescGZIP(), []int{7}
+	return file_command_command_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *Platform) GetProperties() []*Platform_Property {
@@ -685,7 +757,7 @@
 }
 
 // RuntimeConfig is config for runtime.
-// NEXT ID TO USE: 9
+// NEXT ID TO USE: 10
 type RuntimeConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -723,12 +795,13 @@
 	// selector field that is not specified in disallowed_commands will
 	// match any selector.
 	DisallowedCommands []*Selector `protobuf:"bytes,5,rep,name=disallowed_commands,json=disallowedCommands,proto3" json:"disallowed_commands,omitempty"`
+	Acl                *ACL        `protobuf:"bytes,9,opt,name=acl,proto3" json:"acl,omitempty"`
 }
 
 func (x *RuntimeConfig) Reset() {
 	*x = RuntimeConfig{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[8]
+		mi := &file_command_command_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -741,7 +814,7 @@
 func (*RuntimeConfig) ProtoMessage() {}
 
 func (x *RuntimeConfig) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[8]
+	mi := &file_command_command_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -754,7 +827,7 @@
 
 // Deprecated: Use RuntimeConfig.ProtoReflect.Descriptor instead.
 func (*RuntimeConfig) Descriptor() ([]byte, []int) {
-	return file_command_command_proto_rawDescGZIP(), []int{8}
+	return file_command_command_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *RuntimeConfig) GetName() string {
@@ -806,6 +879,13 @@
 	return nil
 }
 
+func (x *RuntimeConfig) GetAcl() *ACL {
+	if x != nil {
+		return x.Acl
+	}
+	return nil
+}
+
 // PlatformRuntimeConfig is a config to use the runtime.
 // NEXT ID TO USE: 3
 type PlatformRuntimeConfig struct {
@@ -821,7 +901,7 @@
 func (x *PlatformRuntimeConfig) Reset() {
 	*x = PlatformRuntimeConfig{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[9]
+		mi := &file_command_command_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -834,7 +914,7 @@
 func (*PlatformRuntimeConfig) ProtoMessage() {}
 
 func (x *PlatformRuntimeConfig) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[9]
+	mi := &file_command_command_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -847,7 +927,7 @@
 
 // Deprecated: Use PlatformRuntimeConfig.ProtoReflect.Descriptor instead.
 func (*PlatformRuntimeConfig) Descriptor() ([]byte, []int) {
-	return file_command_command_proto_rawDescGZIP(), []int{9}
+	return file_command_command_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *PlatformRuntimeConfig) GetDimensions() []string {
@@ -878,7 +958,7 @@
 func (x *ConfigMap) Reset() {
 	*x = ConfigMap{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[10]
+		mi := &file_command_command_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -891,7 +971,7 @@
 func (*ConfigMap) ProtoMessage() {}
 
 func (x *ConfigMap) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[10]
+	mi := &file_command_command_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -904,7 +984,7 @@
 
 // Deprecated: Use ConfigMap.ProtoReflect.Descriptor instead.
 func (*ConfigMap) Descriptor() ([]byte, []int) {
-	return file_command_command_proto_rawDescGZIP(), []int{10}
+	return file_command_command_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *ConfigMap) GetRuntimes() []*RuntimeConfig {
@@ -927,7 +1007,7 @@
 func (x *ConfigResp) Reset() {
 	*x = ConfigResp{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[11]
+		mi := &file_command_command_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -940,7 +1020,7 @@
 func (*ConfigResp) ProtoMessage() {}
 
 func (x *ConfigResp) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[11]
+	mi := &file_command_command_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -953,7 +1033,7 @@
 
 // Deprecated: Use ConfigResp.ProtoReflect.Descriptor instead.
 func (*ConfigResp) Descriptor() ([]byte, []int) {
-	return file_command_command_proto_rawDescGZIP(), []int{11}
+	return file_command_command_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *ConfigResp) GetVersionId() string {
@@ -1000,7 +1080,7 @@
 func (x *CmdDescriptor_Setup) Reset() {
 	*x = CmdDescriptor_Setup{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[12]
+		mi := &file_command_command_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1013,7 +1093,7 @@
 func (*CmdDescriptor_Setup) ProtoMessage() {}
 
 func (x *CmdDescriptor_Setup) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[12]
+	mi := &file_command_command_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1072,7 +1152,7 @@
 func (x *CmdDescriptor_Cross) Reset() {
 	*x = CmdDescriptor_Cross{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[13]
+		mi := &file_command_command_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1085,7 +1165,7 @@
 func (*CmdDescriptor_Cross) ProtoMessage() {}
 
 func (x *CmdDescriptor_Cross) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[13]
+	mi := &file_command_command_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1124,7 +1204,7 @@
 func (x *CmdDescriptor_EmulationOpts) Reset() {
 	*x = CmdDescriptor_EmulationOpts{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[14]
+		mi := &file_command_command_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1137,7 +1217,7 @@
 func (*CmdDescriptor_EmulationOpts) ProtoMessage() {}
 
 func (x *CmdDescriptor_EmulationOpts) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[14]
+	mi := &file_command_command_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1174,7 +1254,7 @@
 func (x *RemoteexecPlatform_Property) Reset() {
 	*x = RemoteexecPlatform_Property{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[15]
+		mi := &file_command_command_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1187,7 +1267,7 @@
 func (*RemoteexecPlatform_Property) ProtoMessage() {}
 
 func (x *RemoteexecPlatform_Property) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[15]
+	mi := &file_command_command_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1229,7 +1309,7 @@
 func (x *Platform_Property) Reset() {
 	*x = Platform_Property{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_command_command_proto_msgTypes[16]
+		mi := &file_command_command_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1242,7 +1322,7 @@
 func (*Platform_Property) ProtoMessage() {}
 
 func (x *Platform_Property) ProtoReflect() protoreflect.Message {
-	mi := &file_command_command_proto_msgTypes[16]
+	mi := &file_command_command_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1255,7 +1335,7 @@
 
 // Deprecated: Use Platform_Property.ProtoReflect.Descriptor instead.
 func (*Platform_Property) Descriptor() ([]byte, []int) {
-	return file_command_command_proto_rawDescGZIP(), []int{7, 0}
+	return file_command_command_proto_rawDescGZIP(), []int{8, 0}
 }
 
 func (x *Platform_Property) GetName() string {
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+	0x03, 0x28, 0x09, 0x52, 0x10, 0x61, 0x6c, 0x6c, 0x6f, 0x77, 0x65, 0x64, 0x50, 0x72, 0x65, 0x62,
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+	0x77, 0x65, 0x64, 0x5f, 0x70, 0x72, 0x65, 0x62, 0x75, 0x69, 0x6c, 0x74, 0x73, 0x18, 0x04, 0x20,
+	0x03, 0x28, 0x09, 0x52, 0x13, 0x64, 0x69, 0x73, 0x61, 0x6c, 0x6c, 0x6f, 0x77, 0x65, 0x64, 0x50,
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+	0x05, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x11, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x2e,
+	0x53, 0x65, 0x6c, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x52, 0x12, 0x64, 0x69, 0x73, 0x61, 0x6c, 0x6c,
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+	0x61, 0x63, 0x6c, 0x18, 0x09, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0c, 0x2e, 0x63, 0x6f, 0x6d, 0x6d,
+	0x61, 0x6e, 0x64, 0x2e, 0x41, 0x43, 0x4c, 0x52, 0x03, 0x61, 0x63, 0x6c, 0x4a, 0x04, 0x08, 0x07,
+	0x10, 0x08, 0x52, 0x15, 0x72, 0x62, 0x65, 0x5f, 0x69, 0x6e, 0x73, 0x74, 0x61, 0x6e, 0x63, 0x65,
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+	0x74, 0x66, 0x6f, 0x72, 0x6d, 0x52, 0x75, 0x6e, 0x74, 0x69, 0x6d, 0x65, 0x43, 0x6f, 0x6e, 0x66,
+	0x69, 0x67, 0x12, 0x1e, 0x0a, 0x0a, 0x64, 0x69, 0x6d, 0x65, 0x6e, 0x73, 0x69, 0x6f, 0x6e, 0x73,
+	0x18, 0x01, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0a, 0x64, 0x69, 0x6d, 0x65, 0x6e, 0x73, 0x69, 0x6f,
+	0x6e, 0x73, 0x12, 0x1d, 0x0a, 0x0a, 0x68, 0x61, 0x73, 0x5f, 0x6e, 0x73, 0x6a, 0x61, 0x69, 0x6c,
+	0x18, 0x02, 0x20, 0x01, 0x28, 0x08, 0x52, 0x09, 0x68, 0x61, 0x73, 0x4e, 0x73, 0x6a, 0x61, 0x69,
+	0x6c, 0x22, 0x3f, 0x0a, 0x09, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x4d, 0x61, 0x70, 0x12, 0x32,
+	0x0a, 0x08, 0x72, 0x75, 0x6e, 0x74, 0x69, 0x6d, 0x65, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b,
+	0x32, 0x16, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x2e, 0x52, 0x75, 0x6e, 0x74, 0x69,
+	0x6d, 0x65, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x08, 0x72, 0x75, 0x6e, 0x74, 0x69, 0x6d,
+	0x65, 0x73, 0x22, 0x56, 0x0a, 0x0a, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x65, 0x73, 0x70,
+	0x12, 0x1d, 0x0a, 0x0a, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x5f, 0x69, 0x64, 0x18, 0x02,
+	0x20, 0x01, 0x28, 0x09, 0x52, 0x09, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x49, 0x64, 0x12,
+	0x29, 0x0a, 0x07, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b,
+	0x32, 0x0f, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x69,
+	0x67, 0x52, 0x07, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x73, 0x42, 0x2b, 0x5a, 0x29, 0x67, 0x6f,
+	0x2e, 0x63, 0x68, 0x72, 0x6f, 0x6d, 0x69, 0x75, 0x6d, 0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x67, 0x6f,
+	0x6d, 0x61, 0x2f, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f,
+	0x63, 0x6f, 0x6d, 0x6d, 0x61, 0x6e, 0x64, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1459,7 +1548,7 @@
 }
 
 var file_command_command_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_command_command_proto_msgTypes = make([]protoimpl.MessageInfo, 17)
+var file_command_command_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
 var file_command_command_proto_goTypes = []interface{}{
 	(CmdDescriptor_PathType)(0),         // 0: command.CmdDescriptor.PathType
 	(*Selector)(nil),                    // 1: command.Selector
@@ -1469,45 +1558,48 @@
 	(*CmdDescriptor)(nil),               // 5: command.CmdDescriptor
 	(*RemoteexecPlatform)(nil),          // 6: command.RemoteexecPlatform
 	(*Config)(nil),                      // 7: command.Config
-	(*Platform)(nil),                    // 8: command.Platform
-	(*RuntimeConfig)(nil),               // 9: command.RuntimeConfig
-	(*PlatformRuntimeConfig)(nil),       // 10: command.PlatformRuntimeConfig
-	(*ConfigMap)(nil),                   // 11: command.ConfigMap
-	(*ConfigResp)(nil),                  // 12: command.ConfigResp
-	(*CmdDescriptor_Setup)(nil),         // 13: command.CmdDescriptor.Setup
-	(*CmdDescriptor_Cross)(nil),         // 14: command.CmdDescriptor.Cross
-	(*CmdDescriptor_EmulationOpts)(nil), // 15: command.CmdDescriptor.EmulationOpts
-	(*RemoteexecPlatform_Property)(nil), // 16: command.RemoteexecPlatform.Property
-	(*Platform_Property)(nil),           // 17: command.Platform.Property
-	(*api.FileBlob)(nil),                // 18: devtools_goma.FileBlob
-	(*timestamp.Timestamp)(nil),         // 19: google.protobuf.Timestamp
+	(*ACL)(nil),                         // 8: command.ACL
+	(*Platform)(nil),                    // 9: command.Platform
+	(*RuntimeConfig)(nil),               // 10: command.RuntimeConfig
+	(*PlatformRuntimeConfig)(nil),       // 11: command.PlatformRuntimeConfig
+	(*ConfigMap)(nil),                   // 12: command.ConfigMap
+	(*ConfigResp)(nil),                  // 13: command.ConfigResp
+	(*CmdDescriptor_Setup)(nil),         // 14: command.CmdDescriptor.Setup
+	(*CmdDescriptor_Cross)(nil),         // 15: command.CmdDescriptor.Cross
+	(*CmdDescriptor_EmulationOpts)(nil), // 16: command.CmdDescriptor.EmulationOpts
+	(*RemoteexecPlatform_Property)(nil), // 17: command.RemoteexecPlatform.Property
+	(*Platform_Property)(nil),           // 18: command.Platform.Property
+	(*api.FileBlob)(nil),                // 19: devtools_goma.FileBlob
+	(*timestamppb.Timestamp)(nil),       // 20: google.protobuf.Timestamp
 }
 var file_command_command_proto_depIdxs = []int32{
-	18, // 0: command.FileSpec.blob:type_name -> devtools_goma.FileBlob
-	19, // 1: command.BuildInfo.timestamp:type_name -> google.protobuf.Timestamp
+	19, // 0: command.FileSpec.blob:type_name -> devtools_goma.FileBlob
+	20, // 1: command.BuildInfo.timestamp:type_name -> google.protobuf.Timestamp
 	1,  // 2: command.CmdDescriptor.selector:type_name -> command.Selector
-	13, // 3: command.CmdDescriptor.setup:type_name -> command.CmdDescriptor.Setup
-	14, // 4: command.CmdDescriptor.cross:type_name -> command.CmdDescriptor.Cross
-	15, // 5: command.CmdDescriptor.emulation_opts:type_name -> command.CmdDescriptor.EmulationOpts
-	16, // 6: command.RemoteexecPlatform.properties:type_name -> command.RemoteexecPlatform.Property
+	14, // 3: command.CmdDescriptor.setup:type_name -> command.CmdDescriptor.Setup
+	15, // 4: command.CmdDescriptor.cross:type_name -> command.CmdDescriptor.Cross
+	16, // 5: command.CmdDescriptor.emulation_opts:type_name -> command.CmdDescriptor.EmulationOpts
+	17, // 6: command.RemoteexecPlatform.properties:type_name -> command.RemoteexecPlatform.Property
 	3,  // 7: command.Config.target:type_name -> command.Target
 	4,  // 8: command.Config.build_info:type_name -> command.BuildInfo
 	5,  // 9: command.Config.cmd_descriptor:type_name -> command.CmdDescriptor
 	6,  // 10: command.Config.remoteexec_platform:type_name -> command.RemoteexecPlatform
-	17, // 11: command.Platform.properties:type_name -> command.Platform.Property
-	10, // 12: command.RuntimeConfig.platform_runtime_config:type_name -> command.PlatformRuntimeConfig
-	8,  // 13: command.RuntimeConfig.platform:type_name -> command.Platform
-	1,  // 14: command.RuntimeConfig.disallowed_commands:type_name -> command.Selector
-	9,  // 15: command.ConfigMap.runtimes:type_name -> command.RuntimeConfig
-	7,  // 16: command.ConfigResp.configs:type_name -> command.Config
-	2,  // 17: command.CmdDescriptor.Setup.cmd_file:type_name -> command.FileSpec
-	2,  // 18: command.CmdDescriptor.Setup.files:type_name -> command.FileSpec
-	0,  // 19: command.CmdDescriptor.Setup.path_type:type_name -> command.CmdDescriptor.PathType
-	20, // [20:20] is the sub-list for method output_type
-	20, // [20:20] is the sub-list for method input_type
-	20, // [20:20] is the sub-list for extension type_name
-	20, // [20:20] is the sub-list for extension extendee
-	0,  // [0:20] is the sub-list for field type_name
+	8,  // 11: command.Config.acl:type_name -> command.ACL
+	18, // 12: command.Platform.properties:type_name -> command.Platform.Property
+	11, // 13: command.RuntimeConfig.platform_runtime_config:type_name -> command.PlatformRuntimeConfig
+	9,  // 14: command.RuntimeConfig.platform:type_name -> command.Platform
+	1,  // 15: command.RuntimeConfig.disallowed_commands:type_name -> command.Selector
+	8,  // 16: command.RuntimeConfig.acl:type_name -> command.ACL
+	10, // 17: command.ConfigMap.runtimes:type_name -> command.RuntimeConfig
+	7,  // 18: command.ConfigResp.configs:type_name -> command.Config
+	2,  // 19: command.CmdDescriptor.Setup.cmd_file:type_name -> command.FileSpec
+	2,  // 20: command.CmdDescriptor.Setup.files:type_name -> command.FileSpec
+	0,  // 21: command.CmdDescriptor.Setup.path_type:type_name -> command.CmdDescriptor.PathType
+	22, // [22:22] is the sub-list for method output_type
+	22, // [22:22] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_command_command_proto_init() }
@@ -1601,7 +1693,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Platform); i {
+			switch v := v.(*ACL); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1613,7 +1705,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RuntimeConfig); i {
+			switch v := v.(*Platform); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1625,7 +1717,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*PlatformRuntimeConfig); i {
+			switch v := v.(*RuntimeConfig); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1637,7 +1729,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ConfigMap); i {
+			switch v := v.(*PlatformRuntimeConfig); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1649,7 +1741,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ConfigResp); i {
+			switch v := v.(*ConfigMap); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1661,7 +1753,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CmdDescriptor_Setup); i {
+			switch v := v.(*ConfigResp); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1673,7 +1765,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CmdDescriptor_Cross); i {
+			switch v := v.(*CmdDescriptor_Setup); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1685,7 +1777,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CmdDescriptor_EmulationOpts); i {
+			switch v := v.(*CmdDescriptor_Cross); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1697,7 +1789,7 @@
 			}
 		}
 		file_command_command_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RemoteexecPlatform_Property); i {
+			switch v := v.(*CmdDescriptor_EmulationOpts); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1709,6 +1801,18 @@
 			}
 		}
 		file_command_command_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RemoteexecPlatform_Property); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_command_command_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Platform_Property); i {
 			case 0:
 				return &v.state
@@ -1727,7 +1831,7 @@
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_command_command_proto_rawDesc,
 			NumEnums:      1,
-			NumMessages:   17,
+			NumMessages:   18,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/proto/command/command.proto b/proto/command/command.proto
index f343b28..20caf55 100644
--- a/proto/command/command.proto
+++ b/proto/command/command.proto
@@ -185,6 +185,23 @@
   // If this config is configured for arbitrary toolchain support,
   // set dimensions of the config. Otherwise, this should be nil.
   repeated string dimensions = 6;
+
+  ACL acl = 7;
+}
+
+// ACL is access control list for requester.
+message ACL {
+  // Groups that is allowed to use.
+  // If allowed_groups specified, only groups in allowed_groups are
+  // allowed, and other groups are disallowed.
+  // If no allowed_groups specified, any groups are allowed
+  // if it is not disallowed by disallowed_groups.
+  repeated string allowed_groups = 1;
+
+  // Groups that is not allowed to use.
+  // If no disallowed_groups specified, only allowed_groups is allowed to use.
+  // If both are not specified, any groups are alllowed.
+  repeated string disallowed_groups = 2;
 }
 
 // Platform is a set of requirements, such as haredware, operting system
@@ -199,7 +216,7 @@
 }
 
 // RuntimeConfig is config for runtime.
-// NEXT ID TO USE: 9
+// NEXT ID TO USE: 10
 message RuntimeConfig {
   // name of runtime.
   //
@@ -246,6 +263,8 @@
   // selector field that is not specified in disallowed_commands will
   // match any selector.
   repeated Selector disallowed_commands = 5;
+
+  ACL acl = 9;
 }
 
 // PlatformRuntimeConfig is a config to use the runtime.
diff --git a/proto/command/command_service.pb.go b/proto/command/command_service.pb.go
index 06ea894..57d6967 100644
--- a/proto/command/command_service.pb.go
+++ b/proto/command/command_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: command/command_service.proto
 
 package command
diff --git a/proto/command/package_opts.pb.go b/proto/command/package_opts.pb.go
index 21a89aa..0e851e7 100644
--- a/proto/command/package_opts.pb.go
+++ b/proto/command/package_opts.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: command/package_opts.proto
 
 package command
diff --git a/proto/command/setup.pb.go b/proto/command/setup.pb.go
index 4f1384d..107ba2c 100644
--- a/proto/command/setup.pb.go
+++ b/proto/command/setup.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: command/setup.proto
 
 package command
diff --git a/proto/exec/exec_service.pb.go b/proto/exec/exec_service.pb.go
index 33ebeee..4655cb4 100644
--- a/proto/exec/exec_service.pb.go
+++ b/proto/exec/exec_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: exec/exec_service.proto
 
 package exec
diff --git a/proto/execlog/log_service.pb.go b/proto/execlog/log_service.pb.go
index c487a58..1edd51c 100644
--- a/proto/execlog/log_service.pb.go
+++ b/proto/execlog/log_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: execlog/log_service.proto
 
 package execlog
diff --git a/proto/file/file_service.pb.go b/proto/file/file_service.pb.go
index fd650cb..ebaab39 100644
--- a/proto/file/file_service.pb.go
+++ b/proto/file/file_service.pb.go
@@ -8,7 +8,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: file/file_service.proto
 
 package file
diff --git a/proto/google/protobuf/timestamp.proto b/proto/google/protobuf/timestamp.proto
index cd35786..3b2df6d 100644
--- a/proto/google/protobuf/timestamp.proto
+++ b/proto/google/protobuf/timestamp.proto
@@ -34,7 +34,7 @@
 
 option csharp_namespace = "Google.Protobuf.WellKnownTypes";
 option cc_enable_arenas = true;
-option go_package = "github.com/golang/protobuf/ptypes/timestamp";
+option go_package = "google.golang.org/protobuf/types/known/timestamppb";
 option java_package = "com.google.protobuf";
 option java_outer_classname = "TimestampProto";
 option java_multiple_files = true;
@@ -91,7 +91,16 @@
 //         .setNanos((int) ((millis % 1000) * 1000000)).build();
 //
 //
-// Example 5: Compute Timestamp from current time in Python.
+// Example 5: Compute Timestamp from Java `Instant.now()`.
+//
+//     Instant now = Instant.now();
+//
+//     Timestamp timestamp =
+//         Timestamp.newBuilder().setSeconds(now.getEpochSecond())
+//             .setNanos(now.getNano()).build();
+//
+//
+// Example 6: Compute Timestamp from current time in Python.
 //
 //     timestamp = Timestamp()
 //     timestamp.GetCurrentTime()
diff --git a/proto/nsjail/config.pb.go b/proto/nsjail/config.pb.go
index bf856be..c64e860 100644
--- a/proto/nsjail/config.pb.go
+++ b/proto/nsjail/config.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: nsjail/config.proto
 
 package nsjail
diff --git a/proto/settings/settings.pb.go b/proto/settings/settings.pb.go
index bba47f7..40ec4f5 100644
--- a/proto/settings/settings.pb.go
+++ b/proto/settings/settings.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: settings/settings.proto
 
 package settings
diff --git a/proto/settings/settings_service.pb.go b/proto/settings/settings_service.pb.go
index ff50426..e6c727e 100644
--- a/proto/settings/settings_service.pb.go
+++ b/proto/settings/settings_service.pb.go
@@ -5,7 +5,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.15.3
 // source: settings/settings_service.proto
 
 package settings
diff --git a/remoteexec/adapter.go b/remoteexec/adapter.go
index 4323cc9..c75d62e 100644
--- a/remoteexec/adapter.go
+++ b/remoteexec/adapter.go
@@ -41,6 +41,31 @@
 	Get(context.Context, string, digest.Source) (digest.Data, error)
 }
 
+// SpanTimeout specifies Timeout for exec span.
+// 0 is no time out.
+type SpanTimeout struct {
+	Inventory    time.Duration
+	InputTree    time.Duration
+	Setup        time.Duration
+	CheckCache   time.Duration
+	CheckMissing time.Duration
+	UploadBlobs  time.Duration
+	Execute      time.Duration
+	Response     time.Duration
+}
+
+// DefaultSpanTimeout is default timeout.
+var DefaultSpanTimeout = SpanTimeout{
+	Inventory:    1 * time.Second,
+	InputTree:    60 * time.Second,
+	Setup:        1 * time.Second,
+	CheckCache:   3 * time.Second,
+	CheckMissing: 10 * time.Second,
+	UploadBlobs:  60 * time.Second,
+	Execute:      0,
+	Response:     30 * time.Second,
+}
+
 // Adapter is an adapter from goma API to remoteexec API.
 type Adapter struct {
 	// InstancePrefix is the prefix (dirname) of the full RBE instance name.
@@ -48,8 +73,15 @@
 	// then InstancePrefix is "projects/$PROJECT/instances"
 	InstancePrefix string
 
-	Inventory   exec.Inventory
+	// InstanceBaseName is the name (basename) of the full RBE instance name.
+	// If emtpy, use "default_instance".
+	InstanceBaseName string
+
+	Inventory exec.Inventory
+	// ExecTimeout is timeout of Action in RBE.
 	ExecTimeout time.Duration
+	// SpanTimeout is timeout of each span in a Goma Exec request.
+	SpanTimeout SpanTimeout
 
 	// Client is remoteexec API client.
 	Client         Client
@@ -81,6 +113,10 @@
 
 	// Ratio to enable hardening.
 	HardeningRatio float64
+	// Ratio to use nsjail for hardening.
+	NsjailRatio float64
+	// sha256 file hash to disable hardening.
+	DisableHardenings []string
 
 	capMu        sync.Mutex
 	capabilities *rpb.ServerCapabilities
@@ -176,8 +212,12 @@
 	return client
 }
 
-func (f *Adapter) DefaultInstance() string {
-	return path.Join(f.InstancePrefix, "default_instance")
+func (f *Adapter) Instance() string {
+	name := f.InstanceBaseName
+	if name == "" {
+		name = "default_instance"
+	}
+	return path.Join(f.InstancePrefix, name)
 }
 
 func (f *Adapter) ensureCapabilities(ctx context.Context) {
@@ -190,7 +230,7 @@
 	logger := log.FromContext(ctx)
 	var err error
 	f.capabilities, err = f.client(ctx).GetCapabilities(ctx, &rpb.GetCapabilitiesRequest{
-		InstanceName: f.DefaultInstance(),
+		InstanceName: f.Instance(),
 	})
 	if err != nil {
 		logger.Errorf("GetCapabilities: %v", err)
@@ -321,6 +361,10 @@
 			logger.Errorf("failed to record stats: %v", err)
 		}
 	}()
+	err = exec.RecordRequesterInfo(ctx, req.GetRequesterInfo())
+	if err != nil {
+		logger.Errorf("failed to record stats: %v", err)
+	}
 
 	// Use this to collect all timestamps and then print on one line,
 	// regardless of where this function returns.
@@ -335,7 +379,7 @@
 	defer r.Close()
 	espan.req = r
 
-	dur := espan.Do(ctx, "inventory", 1*time.Second, func(ctx context.Context) {
+	dur := espan.Do(ctx, "inventory", f.SpanTimeout.Inventory, func(ctx context.Context) {
 		resp = r.getInventoryData(ctx)
 	})
 	if resp != nil {
@@ -343,7 +387,7 @@
 		return resp, nil
 	}
 
-	dur = espan.Do(ctx, "input tree", 30*time.Second, func(ctx context.Context) {
+	dur = espan.Do(ctx, "input tree", f.SpanTimeout.InputTree, func(ctx context.Context) {
 		resp = r.newInputTree(ctx)
 	})
 	if resp != nil {
@@ -351,31 +395,31 @@
 		return resp, nil
 	}
 
-	espan.Do(ctx, "setup", 1*time.Second, func(ctx context.Context) {
+	espan.Do(ctx, "setup", f.SpanTimeout.Setup, func(ctx context.Context) {
 		r.setupNewAction(ctx)
 	})
 
 	eresp := &rpb.ExecuteResponse{}
 	var cached bool
-	espan.Do(ctx, "check cache", 3*time.Second, func(ctx context.Context) {
+	espan.Do(ctx, "check cache", f.SpanTimeout.CheckCache, func(ctx context.Context) {
 		eresp.Result, cached = r.checkCache(ctx)
 	})
 	if !cached {
 		var blobs []*rpb.Digest
 		var err error
-		espan.Do(ctx, "check missing", 10*time.Second, func(ctx context.Context) {
+		espan.Do(ctx, "check missing", f.SpanTimeout.CheckMissing, func(ctx context.Context) {
 			blobs, err = r.missingBlobs(ctx)
 		})
 		if err != nil {
-			logger.Errorf("error in check missing blobs: %v", err)
+			logger.Errorf("exec call: error in check missing blobs: %v", err)
 			return nil, err
 		}
 
-		espan.Do(ctx, "upload blobs", 30*time.Second, func(ctx context.Context) {
+		espan.Do(ctx, "upload blobs", f.SpanTimeout.UploadBlobs, func(ctx context.Context) {
 			resp, err = r.uploadBlobs(ctx, blobs)
 		})
 		if err != nil {
-			logger.Errorf("error in upload blobs: %v", err)
+			logger.Errorf("exec call: error in upload blobs: %v", err)
 			return nil, err
 		}
 		if resp != nil {
@@ -383,16 +427,19 @@
 			return resp, nil
 		}
 
-		espan.Do(ctx, "execute", 0, func(ctx context.Context) {
+		espan.Do(ctx, "execute", f.SpanTimeout.Execute, func(ctx context.Context) {
 			eresp, err = r.executeAction(ctx)
 		})
 		if err != nil {
-			logger.Infof("execute err=%v", err)
+			logger.Errorf("exec call: execute err=%v", err)
 			return nil, err
 		}
 	}
-	espan.Do(ctx, "response", 30*time.Second, func(ctx context.Context) {
+	espan.Do(ctx, "response", f.SpanTimeout.Response, func(ctx context.Context) {
 		resp, err = r.newResp(ctx, eresp, cached)
 	})
+	if err != nil {
+		logger.Errorf("exec call: resp err=%v", err)
+	}
 	return resp, err
 }
diff --git a/remoteexec/adapter_test.go b/remoteexec/adapter_test.go
index 8c17438..b9817c7 100644
--- a/remoteexec/adapter_test.go
+++ b/remoteexec/adapter_test.go
@@ -817,7 +817,7 @@
 	if action == nil {
 		t.Fatalf("gotAction is nil")
 	}
-	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.DefaultInstance(), ".", action.InputRootDigest)
+	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.Instance(), ".", action.InputRootDigest)
 	if err != nil {
 		t.Fatalf("err %v", err)
 	}
@@ -929,7 +929,7 @@
 	if action == nil {
 		t.Fatalf("gotAction is nil")
 	}
-	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.DefaultInstance(), ".", action.InputRootDigest)
+	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.Instance(), ".", action.InputRootDigest)
 	if err != nil {
 		t.Fatalf("err %v", err)
 	}
@@ -949,7 +949,7 @@
 		}
 	}
 
-	if got, want := files["out/Release/run.sh"].digest, digest.Bytes("relocatable-wrapper-script", []byte(relocatableWrapperScript)).Digest(); !proto.Equal(got, want) {
+	if got, want := files["out/Release/run.sh"].digest, digest.Bytes("wrapper-script", []byte(wrapperScript)).Digest(); !proto.Equal(got, want) {
 		t.Errorf("digest of out/Release/run.sh: %s != %s", got, want)
 	}
 }
@@ -1076,7 +1076,7 @@
 	if action == nil {
 		t.Fatalf("gotAction is nil")
 	}
-	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.DefaultInstance(), ".", action.InputRootDigest)
+	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.Instance(), ".", action.InputRootDigest)
 	if err != nil {
 		t.Fatalf("err %v", err)
 	}
@@ -1096,7 +1096,7 @@
 		}
 	}
 
-	if got, want := files["out/Debug/run.sh"].digest, digest.Bytes("wrapper-script", []byte(relocatableWrapperScript)).Digest(); !proto.Equal(got, want) {
+	if got, want := files["out/Debug/run.sh"].digest, digest.Bytes("wrapper-script", []byte(wrapperScript)).Digest(); !proto.Equal(got, want) {
 		t.Errorf("digest of out/Debug/run.sh: %s != %s", got, want)
 	}
 }
@@ -1186,3 +1186,118 @@
 		})
 	}
 }
+
+func TestAdapterNsjailHardening(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	cluster := &fakeCluster{
+		rbe: newFakeRBE(),
+	}
+	err := cluster.setup(ctx, cluster.rbe.instancePrefix)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer cluster.teardown()
+	clang := newFakeClang(&cluster.cmdStorage, "1234", "x86-64-linux-gnu")
+	err = cluster.pushToolchains(ctx, clang)
+	if err != nil {
+		t.Fatal(err)
+	}
+	var localFiles fakeLocalFiles
+	localFiles.Add("/b/c/w/src/hello.cc", randomSize())
+
+	req := &gomapb.ExecReq{
+		CommandSpec: clang.CommandSpec("clang", "bin/clang"),
+		Arg:         []string{"bin/clang", "-c", "../../src/hello.cc"},
+		Env:         []string{},
+		Cwd:         proto.String("/b/c/w/out/Release"),
+		Input: []*gomapb.ExecReq_Input{
+			localFiles.mustInput(ctx, t, cluster.adapter.GomaFile, "/b/c/w/src/hello.cc", "../../src/hello.cc"),
+		},
+		Subprogram:    []*gomapb.SubprogramSpec{},
+		RequesterInfo: &gomapb.RequesterInfo{},
+		HermeticMode:  proto.Bool(true),
+	}
+
+	cluster.adapter.HardeningRatio = 1.0
+	cluster.adapter.NsjailRatio = 1.0
+
+	resp, err := cluster.adapter.Exec(ctx, req)
+	if err != nil {
+		t.Fatalf("Exec(ctx, req)=%v; %v; want nil error", resp, err)
+	}
+	if resp.GetError() != gomapb.ExecResp_OK {
+		t.Errorf("Exec error=%v; want=%v", resp.GetError(), gomapb.ExecResp_OK)
+	}
+
+	command := cluster.rbe.gotCommand
+	if command == nil {
+		t.Fatalf("gotCommand is nil")
+	}
+	wantArgs := []string{
+		"out/Release/run.sh",
+		"bin/clang", "-c", "../../src/hello.cc",
+	}
+	if diff := cmp.Diff(wantArgs, command.Arguments); diff != "" {
+		t.Errorf("arguments diff want->got\n%s", diff)
+	}
+	if command.WorkingDirectory != "" {
+		t.Errorf(`command.WorkingDirectory=%q; want=""`, command.WorkingDirectory)
+	}
+	workDirExists := false
+	wantWorkDir := "out/Release"
+	for _, v := range command.EnvironmentVariables {
+		if v.Name == "WORK_DIR" {
+			workDirExists = true
+			if v.Value != wantWorkDir {
+				t.Errorf("WORK_DIR=%q; want=%q", v.Value, wantWorkDir)
+			}
+		}
+	}
+
+	if !workDirExists {
+		t.Errorf("WORK_DIR not found")
+	}
+
+	action := cluster.rbe.gotAction
+	if action == nil {
+		t.Fatal("gotAction is nil")
+	}
+	files, err := dumpDir(ctx, t, cluster.adapter.Client, cluster.adapter.Instance(), ".", action.InputRootDigest)
+	if err != nil {
+		t.Fatalf("dumpDir err:%v", err)
+	}
+	runsh, exists := files["out/Release/run.sh"]
+	if !exists {
+		t.Errorf("out/Release/run.sh doesn't exist")
+	} else if !runsh.isExecutable {
+		t.Errorf("out/Release/run.sh is not executable")
+	} else if want := digest.Bytes("run.sh", []byte(nsjailHardeningWrapperScript)).Digest(); !proto.Equal(runsh.digest, want) {
+		t.Errorf("out/Release/run.sh digest=%s; want=%s", runsh.digest, want)
+	}
+	nsjailCfg, exists := files["out/Release/nsjail.cfg"]
+	if !exists {
+		t.Errorf("out/Release/nsjail.cfg doesn't exist")
+	} else if want := digest.Bytes("nsjail.cfg", []byte(nsjailHardeningConfig)).Digest(); !proto.Equal(nsjailCfg.digest, want) {
+		t.Errorf("out/Release/nsjail.cfg digest=%s; want=%s", nsjailCfg.digest, want)
+	}
+
+	var wantProps []*rpb.Platform_Property
+	for _, p := range clang.RemoteexecPlatform.Properties {
+		wantProps = append(wantProps, &rpb.Platform_Property{
+			Name:  p.Name,
+			Value: p.Value,
+		})
+	}
+	wantProps = append(wantProps, &rpb.Platform_Property{
+		Name:  "dockerPrivileged",
+		Value: "true",
+	})
+	sort.Slice(wantProps, func(i, j int) bool {
+		return wantProps[i].Name < wantProps[j].Name
+	})
+	if diff := cmp.Diff(wantProps, command.Platform.GetProperties(), cmp.Comparer(proto.Equal)); diff != "" {
+		t.Errorf("platform.Properties diff want->got\n%s", diff)
+	}
+}
diff --git a/remoteexec/cas/cas.go b/remoteexec/cas/cas.go
index 0d0c82a..c9dcd3a 100644
--- a/remoteexec/cas/cas.go
+++ b/remoteexec/cas/cas.go
@@ -328,14 +328,18 @@
 				st := status.FromProto(res.GetStatus())
 				if st.Code() != codes.OK {
 					span.Annotatef(nil, "batch update blob %v: %v", res.Digest, res.Status)
-					return grpc.Errorf(st.Code(), "batch update blob %v: %v", res.Digest, res.Status)
+					missing.Blobs = append(missing.Blobs, MissingBlob{
+						Digest: res.Digest,
+						Err:    grpc.Errorf(st.Code(), "batch update blob: %v", res.Status),
+					})
 				}
 			}
 			uploaded = true
-			logger.Infof("upload by batch %d blobs in %s", len(batchReq.Requests), time.Since(t))
+			logger.Infof("upload by batch %d blobs (missing:%d) in %s", len(batchReq.Requests), len(missing.Blobs), time.Since(t))
 		}
 	}
 	logger.Infof("upload by streaming from %d out of %d", len(largeBlobs), len(blobs))
+	t := time.Now()
 	for _, blob := range largeBlobs {
 		data, ok := c.Store.Get(blob)
 		if !ok {
@@ -350,10 +354,6 @@
 			rd, err := data.Open(ctx)
 			if err != nil {
 				span.Annotatef(nil, "upload open %v: %v", blob, err)
-				missing.Blobs = append(missing.Blobs, MissingBlob{
-					Digest: blob,
-					Err:    err,
-				})
 				return err
 			}
 			err = UploadDigest(ctx, c.Client.ByteStream(), instance, blob, rd)
@@ -366,9 +366,14 @@
 		})
 		if err != nil {
 			logger.Errorf("upload streaming %s error: %v", blob, err)
+			missing.Blobs = append(missing.Blobs, MissingBlob{
+				Digest: blob,
+				Err:    err,
+			})
 			continue
 		}
 	}
+	logger.Infof("uploaded by streaming %d (missing:%d) in %s", len(blobs), len(missing.Blobs), time.Since(t))
 	if len(missing.Blobs) > 0 {
 		return missing
 	}
diff --git a/remoteexec/clang-cl.go b/remoteexec/clang-cl.go
index 8cd7bef..c695bb7 100644
--- a/remoteexec/clang-cl.go
+++ b/remoteexec/clang-cl.go
@@ -5,6 +5,7 @@
 package remoteexec
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
@@ -12,20 +13,24 @@
 
 // TODO: share exec/clangcl.go ?
 
+// longest first
 var clangClPathFlags = []string{
-	"--sysroot=",
-	"-B",
-	"-I",
 	"-fcrash-diagnostics-dir=",
-	"-fprofile-instr-use=",
 	"-fprofile-sample-use=",
 	"-fsanitize-blacklist=",
+	"-fprofile-instr-use=",
+	"-resource-dir=",
+	"/vctoolsdir",
+	"/winsysroot",
+	"/winsdkdir",
+	"--sysroot=",
 	"-include=",
 	"-isystem",
-	"-o",
-	"-resource-dir=",
 	"-imsvc",
 	"/FA",
+	"/FI",
+	"/FR",
+	"/FU",
 	"/Fa",
 	"/Fd",
 	"/Fe",
@@ -33,10 +38,11 @@
 	"/Fm",
 	"/Fo",
 	"/Fp",
-	"/FR",
 	"/Fr",
-	"/FU",
 	"/Fx",
+	"-B",
+	"-I",
+	"-o",
 }
 
 func isClangclWarningFlag(arg string) bool {
@@ -223,8 +229,11 @@
 		case isClangclOptimizationFlag(arg): // Flags to handle optimization
 			continue
 
+		case arg == "/FC": // Display full path of source code files passed to cl.exe in diagnostic text.
+			return errors.New("need full path of soruce code for /FC")
+
 		case strings.HasPrefix(arg, "-"), strings.HasPrefix(arg, "/"): // unknown flag?
-			return fmt.Errorf("unknown flag: %s", arg)
+			return unknownFlagError{arg: arg}
 
 		default: // input file?
 			if filepath.IsAbs(arg) {
@@ -252,18 +261,12 @@
 		}
 	}
 
-	for _, env := range envs {
-		e := strings.SplitN(env, "=", 2)
-		if len(e) != 2 {
-			return fmt.Errorf("bad environment variable: %s", env)
-		}
-		if e[0] == "PWD" {
-			continue
-		}
-		if filepath.IsAbs(e[1]) {
-			return fmt.Errorf("abs path in env %s=%s", e[0], e[1])
-		}
-	}
+	// Don't check environment variables.
+	// Typically user sets `INCLUDE=C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Tools\MSVC\14.16.27023\ATLMFC\include;...`
+	// so it makes always non-relocatble.
+	// in chromium build, cang-cl uses -imsvc instead of relying on
+	// %INCLUDE%, so it would be ok to ignore environment variables.
+	// http://b/173755650
 	return nil
 }
 
@@ -289,7 +292,7 @@
 			skipFlag = true
 			continue
 		default:
-			return fmt.Errorf("clang-cl unknown arg: %s", arg)
+			return unknownFlagError{arg: fmt.Sprintf("clang-cl: %s", arg)}
 		}
 	}
 	return nil
diff --git a/remoteexec/clang-cl_test.go b/remoteexec/clang-cl_test.go
index 890f6cf..9e409ca 100644
--- a/remoteexec/clang-cl_test.go
+++ b/remoteexec/clang-cl_test.go
@@ -12,6 +12,16 @@
 	"go.chromium.org/goma/server/command/descriptor/winpath"
 )
 
+func TestCLangCLPathFlags(t *testing.T) {
+	lastP := clangClPathFlags[0]
+	for _, p := range clangClPathFlags[1:] {
+		if len(lastP) < len(p) {
+			t.Errorf("%q is longer than %q", p, lastP)
+		}
+		lastP = p
+	}
+}
+
 func TestIsClangclWarningFlag(t *testing.T) {
 	for _, tc := range []struct {
 		desc  string
@@ -223,6 +233,60 @@
 				"-mllvm", "-basic-aa-recphi=0"),
 			relocatable: true,
 		},
+		{
+			desc: "/FIcompat/msvcrt/snprintf.h",
+			args: append(append([]string{}, baseReleaseArgs...),
+				"/FIcompat/msvcrt/snprintf.h"),
+			relocatable: true,
+		},
+		{
+			desc: `/FIC:\winsdk\compat\msvcrt\snprintf.h`,
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/FIC:\winsdk\compat\msvcrt\snprintf.h`),
+			relocatable: false,
+		},
+		{
+			desc: "/FC",
+			args: append(append([]string{}, baseReleaseArgs...),
+				"/FC"),
+			relocatable: false,
+		},
+		{
+			desc: "/winsysroot relative",
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/winsysroot..\..\third_party\depot_tools\win_toolchain\vs_files\20d5f253f`),
+			relocatable: true,
+		},
+		{
+			desc: "/winsysroot absolute",
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/winsysrootC:\src\chromium\src\third_party\depot_tools\win_toolchain\vs_files\20d5f253f`),
+			relocatable: false,
+		},
+		{
+			desc: "/vctoolsdir relative",
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/vctoolsdir..\..\third_party\depot_tools\win_toolchain\vs_files\20d5f253f\VC\Tools`),
+			relocatable: true,
+		},
+		{
+			desc: "/vctoolsdir absolute",
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/vctoolsdirC:\src\chromium\src\third_party\depot_tools\win_toolchain\vs_files\20d5f253f\VC\Tools`),
+			relocatable: false,
+		},
+		{
+			desc: "/winsdkdir relative",
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/winsdkdir..\..\third_party\depot_tools\win_toolchain\vs_files\20d5f253f\win_sdk`),
+			relocatable: true,
+		},
+		{
+			desc: "/winsdkdir absolute",
+			args: append(append([]string{}, baseReleaseArgs...),
+				`/winsdkdirC:\src\chromium\src\third_party\depot_tools\win_toolchain\vs_files\20d5f253f\win_sdk`),
+			relocatable: false,
+		},
 	} {
 		t.Run(tc.desc, func(t *testing.T) {
 			err := clangclRelocatableReq(winpath.FilePath{}, tc.args, tc.envs)
diff --git a/remoteexec/client.go b/remoteexec/client.go
index a4ebf8d..ef91ba3 100644
--- a/remoteexec/client.go
+++ b/remoteexec/client.go
@@ -226,6 +226,7 @@
 	//   requested, such as a missing input or command or
 	//   no worker being available. The client may be able to
 	//   fix the errors and retry.
+	//   exec_server doesn't fix request, so don't retry.
 	// UNAVAILABLE:
 	//   Due to transient condition, such as all workers being
 	//   occupied (and the server does not support a queue), the
@@ -239,11 +240,11 @@
 	// Other error would be non retriable.
 	switch codes.Code(st.GetCode()) {
 	case codes.OK:
-	case codes.ResourceExhausted:
+	case codes.ResourceExhausted, codes.FailedPrecondition:
 		logger.Warnf("execute response: status=%s", st)
 		return status.FromProto(st).Err()
 
-	case codes.FailedPrecondition, codes.Internal:
+	case codes.Internal:
 		logger.Warnf("execute response: status=%s", st)
 		fallthrough
 	case codes.Unavailable:
diff --git a/remoteexec/digest/digest_cache.go b/remoteexec/digest/digest_cache.go
index 33fc156..01e90d8 100644
--- a/remoteexec/digest/digest_cache.go
+++ b/remoteexec/digest/digest_cache.go
@@ -17,6 +17,8 @@
 	"go.opencensus.io/stats"
 	"go.opencensus.io/stats/view"
 	"go.opencensus.io/tag"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 
 	"go.chromium.org/goma/server/log"
 	cachepb "go.chromium.org/goma/server/proto/cache"
@@ -153,9 +155,13 @@
 		}
 		return d, nil
 	}
-	logger.Infof("digest cache miss %s %v: %s", keystr, err, time.Since(start))
+	op := "get-error"
+	if status.Code(err) == codes.NotFound {
+		op = "miss"
+	}
+	logger.Infof("digest cache %s %s %v: %s", op, keystr, err, time.Since(start))
 	stats.RecordWithTags(ctx, []tag.Mutator{
-		tag.Upsert(opKey, "miss"),
+		tag.Upsert(opKey, op),
 		tag.Upsert(fileExtKey, fileExt),
 	}, cacheStats.M(0))
 	d, err := FromSource(ctx, src)
diff --git a/remoteexec/exec.go b/remoteexec/exec.go
index 43f790d..f8bb143 100644
--- a/remoteexec/exec.go
+++ b/remoteexec/exec.go
@@ -7,6 +7,7 @@
 import (
 	"bytes"
 	"context"
+	"errors"
 	"fmt"
 	"math/rand"
 	"path"
@@ -172,7 +173,7 @@
 func (r *request) instanceName() string {
 	basename := r.cmdConfig.GetRemoteexecPlatform().GetRbeInstanceBasename()
 	if basename == "" {
-		return r.f.DefaultInstance()
+		return r.f.Instance()
 	}
 	return path.Join(r.f.InstancePrefix, basename)
 }
@@ -210,11 +211,36 @@
 	for _, prop := range cmdConfig.GetRemoteexecPlatform().GetProperties() {
 		r.addPlatformProperty(ctx, prop.Name, prop.Value)
 	}
+	if len(r.gomaReq.GetRequesterInfo().GetPlatformProperties()) > 0 {
+		for _, pp := range r.gomaReq.GetRequesterInfo().GetPlatformProperties() {
+			if !isSafePlatformProperty(pp.GetName(), pp.GetValue()) {
+				logger.Errorf("unsafe user platform property: %v", pp)
+				r.gomaResp.Error = gomapb.ExecResp_BAD_REQUEST.Enum()
+				r.gomaResp.ErrorMessage = append(r.gomaResp.ErrorMessage, fmt.Sprintf("unsafe platform property: %v", pp))
+				continue
+			}
+			logger.Infof("override by user platform property: %v", pp)
+			r.addPlatformProperty(ctx, pp.GetName(), pp.GetValue())
+		}
+		if len(r.gomaResp.ErrorMessage) > 0 {
+			return r.gomaResp
+		}
+	}
 	r.allowChroot = cmdConfig.GetRemoteexecPlatform().GetHasNsjail()
 	logger.Infof("platform: %s, allowChroot=%t", r.platform, r.allowChroot)
 	return nil
 }
 
+func isSafePlatformProperty(name, value string) bool {
+	switch name {
+	case "container-image", "InputRootAbsolutePath", "cache-silo":
+		return true
+	case "dockerRuntime":
+		return value == "runsc"
+	}
+	return false
+}
+
 func (r *request) addPlatformProperty(ctx context.Context, name, value string) {
 	for _, p := range r.platform.Properties {
 		if p.Name == name {
@@ -354,7 +380,7 @@
 	missingInput  string
 	missingReason string
 	file          merkletree.Entry
-	uploaded      bool
+	needUpload    bool
 	err           error
 }
 
@@ -397,7 +423,7 @@
 			if input.Content == nil {
 				return
 			}
-			result.uploaded = true
+			result.needUpload = true
 		}(input, &results[i])
 	}
 	wg.Wait()
@@ -408,6 +434,7 @@
 // it returns non-nil ExecResp for:
 // - missing inputs
 // - input root detection failed
+// - non-relative and non C: drive on windows.
 func (r *request) newInputTree(ctx context.Context) *gomapb.ExecResp {
 	if r.err != nil {
 		return nil
@@ -423,7 +450,8 @@
 		r.gomaResp.ErrorMessage = append(r.gomaResp.ErrorMessage, fmt.Sprintf("bad input: %v", err))
 		return r.gomaResp
 	}
-	rootDir, needChroot, err := inputRootDir(r.filepath, inputPaths, r.allowChroot)
+	execRootDir := r.gomaReq.GetRequesterInfo().GetExecRoot()
+	rootDir, needChroot, err := inputRootDir(r.filepath, inputPaths, r.allowChroot, execRootDir)
 	if err != nil {
 		logger.Errorf("input root detection failed: %v", err)
 		logFileList(logger, "input paths", inputPaths)
@@ -434,7 +462,7 @@
 	r.tree = merkletree.New(r.filepath, rootDir, r.digestStore)
 	r.needChroot = needChroot
 
-	logger.Infof("new input tree cwd:%s root:%s %s", r.gomaReq.GetCwd(), r.tree.RootDir(), r.cmdConfig.GetCmdDescriptor().GetSetup().GetPathType())
+	logger.Infof("new input tree cwd:%s root:%s execRoot:%s %s", r.gomaReq.GetCwd(), r.tree.RootDir(), execRootDir, r.cmdConfig.GetCmdDescriptor().GetSetup().GetPathType())
 	// If toolchain_included is true, r.gomaReq.Input and cmdFiles will contain the same files.
 	// To avoid dup, if it's added in r.gomaReq.Input, we don't add it as cmdFiles.
 	// While processing r.gomaReq.Input, we handle missing input, so the main routine is in
@@ -473,7 +501,7 @@
 		if r.err == nil && result.err != nil {
 			r.err = result.err
 		}
-		if result.uploaded {
+		if result.needUpload {
 			uploads = append(uploads, input)
 		}
 	}
@@ -483,14 +511,6 @@
 	}
 	logger.Infof("inputFiles=%d uploads=%d in %s", len(r.gomaReq.Input), len(uploads), time.Since(start))
 
-	start = time.Now()
-	err = uploadInputFiles(ctx, uploads, r.input)
-	if err != nil {
-		r.err = err
-		return nil
-	}
-
-	var uploaded int
 	var files []merkletree.Entry
 	var missingInputs []string
 	var missingReason []string
@@ -500,13 +520,15 @@
 			missingReason = append(missingReason, in.missingReason)
 			continue
 		}
-		files = append(files, in.file)
-		if in.uploaded {
-			uploaded++
+		if in.file.Name == "" {
+			// ignore out of root files.
+			continue
 		}
+		files = append(files, in.file)
 	}
-	logger.Infof("upload %d inputs, missing %d inputs out of %d in %s", uploaded, len(missingInputs), len(r.gomaReq.Input), time.Since(start))
 	if len(missingInputs) > 0 {
+		logger.Infof("missing %d inputs out of %d. need to uploads=%d", len(missingInputs), len(r.gomaReq.Input), len(uploads))
+
 		r.gomaResp.MissingInput = missingInputs
 		r.gomaResp.MissingReason = missingReason
 		thinOutMissing(r.gomaResp, missingInputLimit)
@@ -518,6 +540,13 @@
 	// create wrapper scripts
 	err = r.newWrapperScript(ctx, r.cmdConfig, r.cmdFiles[0].Path)
 	if err != nil {
+		var badReqErr badRequestError
+		if errors.As(err, &badReqErr) {
+			r.gomaResp.Error = gomapb.ExecResp_BAD_REQUEST.Enum()
+			r.gomaResp.ErrorMessage = append(r.gomaResp.ErrorMessage, badReqErr.Error())
+			return r.gomaResp
+		}
+		// otherwise, internal error.
 		r.err = fmt.Errorf("wrapper script: %v", err)
 		return nil
 	}
@@ -610,6 +639,15 @@
 	logger.Infof("input root digest: %v", root)
 	r.action.InputRootDigest = root
 
+	// uploads embedded contents to file-server
+	// for the case the file was not yet uploaded to RBE CAS.
+	// even if client sends input with embedded content,
+	// the content may be already uploaded to RBE CAS,
+	// and uploaded content may not be needed,
+	// so we could ignore error of these uploads.
+	start = time.Now()
+	err = uploadInputFiles(ctx, uploads, r.input)
+	logger.Infof("upload %d inputs out of %d in %s: %v", len(uploads), len(r.gomaReq.Input), time.Since(start), err)
 	return nil
 }
 
@@ -644,7 +682,7 @@
 	// TODO: use working_directory in action.
 	// need to fix output path to be relative to working_directory.
 	// http://b/113370588
-	relocatableWrapperScript = `#!/bin/bash
+	wrapperScript = `#!/bin/bash
 set -e
 if [[ "$WORK_DIR" != "" ]]; then
   cd "${WORK_DIR}"
@@ -653,6 +691,14 @@
 `
 )
 
+type badRequestError struct {
+	err error
+}
+
+func (b badRequestError) Error() string {
+	return b.err.Error()
+}
+
 // TODO: put wrapper script in platform container?
 func (r *request) newWrapperScript(ctx context.Context, cmdConfig *cmdpb.Config, argv0 string) error {
 	logger := log.FromContext(ctx)
@@ -662,7 +708,7 @@
 	cleanRootDir := r.filepath.Clean(r.tree.RootDir())
 	wd, err := rootRel(r.filepath, cwd, cleanCWD, cleanRootDir)
 	if err != nil {
-		return fmt.Errorf("bad cwd=%s: %v", cwd, err)
+		return badRequestError{err: fmt.Errorf("bad cwd=%s: %v", cwd, err)}
 	}
 	if wd == "" {
 		wd = "."
@@ -674,16 +720,12 @@
 	// However, only the first one is called in the command line.
 	// The other scripts should be called from the first wrapper script
 	// if needed.
-	type fileDesc struct {
-		name         string
-		data         digest.Data
-		isExecutable bool
-	}
-	var files []fileDesc
+	var files []merkletree.Entry
 
 	args := buildArgs(ctx, cmdConfig, argv0, r.gomaReq)
 	// TODO: only allow specific envs.
 
+	var relocatableErr error
 	wt := wrapperRelocatable
 	pathType := cmdConfig.GetCmdDescriptor().GetSetup().GetPathType()
 	switch pathType {
@@ -691,21 +733,22 @@
 		if r.needChroot {
 			wt = wrapperNsjailChroot
 		} else {
-			err = relocatableReq(ctx, cmdConfig, r.filepath, r.gomaReq.Arg, r.gomaReq.Env)
-			if err != nil {
+			relocatableErr = relocatableReq(ctx, cmdConfig, r.filepath, r.gomaReq.Arg, r.gomaReq.Env)
+			if relocatableErr != nil {
 				wt = wrapperInputRootAbsolutePath
-				logger.Infof("non relocatable: %v", err)
+				logger.Infof("non relocatable: %v", relocatableErr)
 			}
 		}
 	case cmdpb.CmdDescriptor_WINDOWS:
-		err = relocatableReq(ctx, cmdConfig, r.filepath, r.gomaReq.Arg, r.gomaReq.Env)
-		if err != nil {
+		relocatableErr = relocatableReq(ctx, cmdConfig, r.filepath, r.gomaReq.Arg, r.gomaReq.Env)
+		if relocatableErr != nil {
 			wt = wrapperWinInputRootAbsolutePath
-			logger.Infof("non relocatable: %v", err)
+			logger.Infof("non relocatable: %v", relocatableErr)
 		} else {
 			wt = wrapperWin
 		}
 	default:
+		// internal error? maybe toolchain config is broken.
 		return fmt.Errorf("bad path type: %v", pathType)
 	}
 
@@ -717,44 +760,36 @@
 		r.addPlatformProperty(ctx, "dockerPrivileged", "true")
 		// needed for chroot command and mount command.
 		r.addPlatformProperty(ctx, "dockerRunAsRoot", "true")
-		nsjailCfg := nsjailConfig(cwd, r.filepath, r.gomaReq.GetToolchainSpecs(), r.gomaReq.Env)
-		files = []fileDesc{
+		nsjailCfg := nsjailChrootConfig(cwd, r.filepath, r.gomaReq.GetToolchainSpecs(), r.gomaReq.Env)
+		files = []merkletree.Entry{
 			{
-				name:         posixWrapperName,
-				data:         digest.Bytes("nsjail-run-wrapper-script", []byte(nsjailRunWrapperScript)),
-				isExecutable: true,
+				Name:         posixWrapperName,
+				Data:         digest.Bytes("nsjail-chroot-run-wrapper-script", []byte(nsjailChrootRunWrapperScript)),
+				IsExecutable: true,
 			},
 			{
-				name: "nsjail.cfg",
-				data: digest.Bytes("nsjail-config-file", []byte(nsjailCfg)),
+				Name: "nsjail.cfg",
+				Data: digest.Bytes("nsjail-config-file", []byte(nsjailCfg)),
 			},
 		}
 	case wrapperInputRootAbsolutePath:
-		if rand.Float64() < r.f.HardeningRatio {
-			logger.Infof("run with InputRootAbsolutePath + runsc")
-			r.addPlatformProperty(ctx, "dockerRuntime", "runsc")
-		} else {
-			logger.Infof("run with InputRootAbsolutePath")
-		}
+		wrapperData := digest.Bytes("wrapper-script", []byte(wrapperScript))
+		files, wrapperData = r.maybeApplyHardening(ctx, "InputRootAbsolutePath", files, wrapperData)
 		// https://cloud.google.com/remote-build-execution/docs/remote-execution-properties#container_properties
 		r.addPlatformProperty(ctx, "InputRootAbsolutePath", r.tree.RootDir())
 		for _, e := range r.gomaReq.Env {
 			envs = append(envs, e)
 		}
-		files = []fileDesc{
+		files = append([]merkletree.Entry{
 			{
-				name:         posixWrapperName,
-				data:         digest.Bytes("relocatable-wrapper-script", []byte(relocatableWrapperScript)),
-				isExecutable: true,
+				Name:         posixWrapperName,
+				Data:         wrapperData,
+				IsExecutable: true,
 			},
-		}
+		}, files...)
 	case wrapperRelocatable:
-		if rand.Float64() < r.f.HardeningRatio {
-			logger.Infof("run with chdir + runsc: relocatable")
-			r.addPlatformProperty(ctx, "dockerRuntime", "runsc")
-		} else {
-			logger.Infof("run with chdir: relocatable")
-		}
+		wrapperData := digest.Bytes("wrapper-script", []byte(wrapperScript))
+		files, wrapperData = r.maybeApplyHardening(ctx, "chdir: relocatble", files, wrapperData)
 		for _, e := range r.gomaReq.Env {
 			if strings.HasPrefix(e, "PWD=") {
 				// PWD is usually absolute path.
@@ -764,32 +799,41 @@
 			}
 			envs = append(envs, e)
 		}
-		files = []fileDesc{
+		files = append([]merkletree.Entry{
 			{
-				name:         posixWrapperName,
-				data:         digest.Bytes("relocatable-wrapper-script", []byte(relocatableWrapperScript)),
-				isExecutable: true,
+				Name:         posixWrapperName,
+				Data:         wrapperData,
+				IsExecutable: true,
 			},
-		}
+		}, files...)
 	case wrapperWin:
 		logger.Infof("run on win")
 		wn, data, err := wrapperForWindows(ctx)
 		if err != nil {
+			// missing run.exe?
 			return err
 		}
-		files = []fileDesc{
+		// no need to set environment variables??
+		files = []merkletree.Entry{
 			{
-				name:         wn,
-				data:         data,
-				isExecutable: true,
+				Name:         wn,
+				Data:         data,
+				IsExecutable: true,
 			},
 		}
 	case wrapperWinInputRootAbsolutePath:
 		logger.Infof("run on win with InputRootAbsolutePath")
+		if relocatableErr != nil && !strings.HasPrefix(strings.ToUpper(r.tree.RootDir()), `C:\`) {
+			// TODO Docker Internal Errors
+			// see also http://b/161274896 Catch specific case where drive letter other than C: specified for input root on Windows
+			logger.Errorf("non relocatable on windows, but absolute path is not C: drive. %s", r.tree.RootDir())
+			return badRequestError{err: fmt.Errorf("non relocatable %v, but root dir is %q. make request relocatable, or use `C:`", relocatableErr, r.tree.RootDir())}
+		}
 		// https://cloud.google.com/remote-build-execution/docs/remote-execution-properties#container_properties
 		r.addPlatformProperty(ctx, "InputRootAbsolutePath", r.tree.RootDir())
 		wn, data, err := wrapperForWindows(ctx)
 		if err != nil {
+			// missing run.exe?
 			return err
 		}
 		// This is necessary for Win emscripten-releases LLVM build, which uses env vars to specify e.g. include
@@ -801,14 +845,15 @@
 				envs = append(envs, e)
 			}
 		}
-		files = []fileDesc{
+		files = []merkletree.Entry{
 			{
-				name:         wn,
-				data:         data,
-				isExecutable: true,
+				Name:         wn,
+				Data:         data,
+				IsExecutable: true,
 			},
 		}
 	default:
+		// coding error?
 		return fmt.Errorf("bad wrapper type: %v", wt)
 	}
 
@@ -816,19 +861,16 @@
 	// `wrapperPath` in `r.args` later.
 	wrapperPath := ""
 	for i, w := range files {
-		wp, err := rootRel(r.filepath, w.name, cleanCWD, cleanRootDir)
+		w.Name, err = rootRel(r.filepath, w.Name, cleanCWD, cleanRootDir)
 		if err != nil {
+			// rootRel should not fail with any user input at this point?
 			return err
 		}
 
-		logger.Infof("file (%d) %s => %v", i, wp, w.data.Digest())
-		r.tree.Set(merkletree.Entry{
-			Name:         wp,
-			Data:         w.data,
-			IsExecutable: w.isExecutable,
-		})
+		logger.Infof("file (%d) %s => %v", i, w.Name, w.Data.Digest())
+		r.tree.Set(w)
 		if wrapperPath == "" {
-			wrapperPath = wp
+			wrapperPath = w.Name
 		}
 	}
 
@@ -849,6 +891,47 @@
 	return nil
 }
 
+func (r *request) maybeApplyHardening(ctx context.Context, wt string, files []merkletree.Entry, wrapperData digest.Data) ([]merkletree.Entry, digest.Data) {
+	logger := log.FromContext(ctx)
+	if f, disable := disableHardening(r.f.DisableHardenings, r.cmdFiles); disable {
+		logger.Infof("run with %s (disable hardening for %v)", wt, f)
+	} else if rand.Float64() < r.f.HardeningRatio {
+		if rand.Float64() < r.f.NsjailRatio {
+			logger.Infof("run with %s + nsjail", wt)
+			wrapperData = digest.Bytes("nsjail-hardening-wrapper-scrpt", []byte(nsjailHardeningWrapperScript))
+			// needed for nsjail
+			r.addPlatformProperty(ctx, "dockerPrivileged", "true")
+			files = append(files, merkletree.Entry{
+				Name: "nsjail.cfg",
+				Data: digest.Bytes("nsjail.cfg", []byte(nsjailHardeningConfig)),
+			})
+		} else {
+			logger.Infof("run with %s + runsc", wt)
+			r.addPlatformProperty(ctx, "dockerRuntime", "runsc")
+		}
+	} else {
+		logger.Infof("run with %s", wt)
+	}
+	return files, wrapperData
+}
+
+func disableHardening(hashes []string, cmdFiles []*cmdpb.FileSpec) (*cmdpb.FileSpec, bool) {
+	for _, h := range hashes {
+		if h == "" {
+			continue
+		}
+		for _, f := range cmdFiles {
+			if f.GetSymlink() != "" {
+				continue
+			}
+			if f.GetHash() == h {
+				return f, true
+			}
+		}
+	}
+	return nil, false
+}
+
 // TODO: refactor with exec/clang.go, exec/clangcl.go?
 
 // buildArgs builds args in RBE from arg0 and req, respecting cmdConfig.
@@ -875,22 +958,42 @@
 	return append(args, fmt.Sprintf("--target=%s", target))
 }
 
+type unknownFlagError struct {
+	arg string
+}
+
+func (e unknownFlagError) Error() string {
+	return fmt.Sprintf("unknown flag: %s", e.arg)
+}
+
 // relocatableReq checks args, envs is relocatable, respecting cmdConfig.
 func relocatableReq(ctx context.Context, cmdConfig *cmdpb.Config, filepath clientFilePath, args, envs []string) error {
-	switch name := cmdConfig.GetCmdDescriptor().GetSelector().GetName(); name {
+	name := cmdConfig.GetCmdDescriptor().GetSelector().GetName()
+	var err error
+	switch name {
 	case "gcc", "g++", "clang", "clang++":
-		return gccRelocatableReq(filepath, args, envs)
+		err = gccRelocatableReq(filepath, args, envs)
 	case "clang-cl":
-		return clangclRelocatableReq(filepath, args, envs)
+		err = clangclRelocatableReq(filepath, args, envs)
 	case "javac":
 		// Currently, javac in Chromium is fully relocatable. Simpler just to
 		// support only the relocatable case and let it fail if the client passed
 		// in invalid absolute paths.
-		return nil
+		err = nil
 	default:
 		// "cl.exe", "clang-tidy"
-		return fmt.Errorf("no relocatable check for %s", name)
+		err = fmt.Errorf("no relocatable check for %s", name)
 	}
+	if err != nil {
+		var uerr unknownFlagError
+		if errors.As(err, &uerr) {
+			if serr := stats.RecordWithTags(ctx, []tag.Mutator{tag.Upsert(compilerNameKey, name)}, unknownFlagCount.M(1)); serr != nil {
+				logger := log.FromContext(ctx)
+				logger.Errorf("record unknown-flag %s: %v", name, serr)
+			}
+		}
+	}
+	return err
 }
 
 // outputs gets output filenames from gomaReq.
@@ -1206,7 +1309,6 @@
 func (r *request) newResp(ctx context.Context, eresp *rpb.ExecuteResponse, cached bool) (*gomapb.ExecResp, error) {
 	logger := log.FromContext(ctx)
 	if r.err != nil {
-		logger.Warnf("error during exec: %v", r.err)
 		return nil, r.Err()
 	}
 	logger.Debugf("response %v cached=%t", eresp, cached)
@@ -1251,6 +1353,7 @@
 		execTime,
 		outputTime)
 	tags := []tag.Mutator{
+		// exit_code=159 is seccomp violation.
 		tag.Upsert(rbeExitKey, fmt.Sprintf("%d", eresp.Result.GetExitCode())),
 		tag.Upsert(rbeCacheKey, r.gomaResp.GetCacheHit().String()),
 		tag.Upsert(rbePlatformOSFamilyKey, osFamily),
@@ -1272,13 +1375,20 @@
 		instance: r.instanceName(),
 		gomaFile: r.f.GomaFile,
 	}
-	// TODO: gomaOutput should return err for codes.Unauthenticated,
+	// gomaOutput should return err for codes.Unauthenticated,
 	// instead of setting ErrorMessage in r.gomaResp,
 	// so it returns to caller (i.e. frontend), and retry with new
-	// refreshed oauth2 access.
-	// token.
-	gout.stdoutData(ctx, eresp)
-	gout.stderrData(ctx, eresp)
+	// refreshed oauth2 access token.
+	for _, f := range []func(context.Context, *rpb.ExecuteResponse) error{
+		gout.stdoutData,
+		gout.stderrData,
+	} {
+		err := f(ctx, eresp)
+		if status.Code(err) == codes.Unauthenticated && r.err == nil {
+			r.err = err
+			return r.gomaResp, r.Err()
+		}
+	}
 
 	if len(r.gomaResp.Result.StdoutBuffer) > 0 {
 		// docker failure would be error of goma server, not users.
@@ -1314,7 +1424,11 @@
 			r.gomaResp.ErrorMessage = append(r.gomaResp.ErrorMessage, fmt.Sprintf("output path %s: %v", output.Path, err))
 			continue
 		}
-		gout.outputFile(ctx, fname, output)
+		err = gout.outputFile(ctx, fname, output)
+		if err != nil && r.err == nil {
+			r.err = err
+			return r.gomaResp, r.Err()
+		}
 	}
 	for _, output := range eresp.Result.OutputDirectories {
 		if r.err != nil {
@@ -1327,7 +1441,11 @@
 			r.gomaResp.ErrorMessage = append(r.gomaResp.ErrorMessage, fmt.Sprintf("output path %s: %v", output.Path, err))
 			continue
 		}
-		gout.outputDirectory(ctx, r.filepath, fname, output, r.f.OutputFileSema)
+		err = gout.outputDirectory(ctx, r.filepath, fname, output, r.f.OutputFileSema)
+		if err != nil && r.err == nil {
+			r.err = err
+			return r.gomaResp, r.Err()
+		}
 	}
 	if len(r.gomaResp.ErrorMessage) == 0 {
 		r.gomaResp.Result.ExitStatus = proto.Int32(eresp.Result.ExitCode)
@@ -1357,16 +1475,24 @@
 }
 
 func platformDockerRuntime(p *rpb.Platform) string {
+	priv := false
+	runAsRoot := false
 	for _, p := range p.Properties {
 		switch p.Name {
 		case "dockerRuntime":
 			return p.Value
 		case "dockerPrivileged":
-			if p.Value == "true" {
-				return "nsjail"
-			}
+			priv = p.Value == "true"
+		case "dockerRunAsRoot":
+			runAsRoot = p.Value == "true"
 		}
 	}
+	switch {
+	case priv && runAsRoot:
+		return "nsjail-chroot"
+	case priv:
+		return "nsjail"
+	}
 	return "default"
 }
 
diff --git a/remoteexec/exec_test.go b/remoteexec/exec_test.go
index 6fec358..8f563d2 100644
--- a/remoteexec/exec_test.go
+++ b/remoteexec/exec_test.go
@@ -350,7 +350,7 @@
 					Data:     digest.Bytes(input.GetFilename(), input.Content.GetContent()),
 				},
 			},
-			uploaded: input.Content != nil,
+			needUpload: input.Content != nil,
 		}
 	}
 
diff --git a/remoteexec/gcc.go b/remoteexec/gcc.go
index 2c89732..10e34bd 100644
--- a/remoteexec/gcc.go
+++ b/remoteexec/gcc.go
@@ -10,21 +10,23 @@
 	"strings"
 )
 
+// longest first
 var pathFlags = []string{
-	"--sysroot=",
-	"-B",
-	"-I",
 	"-fcrash-diagnostics-dir=",
-	"-fprofile-instr-use=",
 	"-fprofile-sample-use=",
 	"-fsanitize-blacklist=",
+	"-fprofile-instr-use=",
+	"-resource-dir=",
 	"--include=",
+	"--sysroot=",
 	"--include",
 	"-include=",
 	"-include",
 	"-isystem",
 	"-o",
-	"-resource-dir=",
+	"-B",
+	"-F",
+	"-I",
 }
 
 // TODO: share exec/gcc.go ?
@@ -153,6 +155,7 @@
 		case strings.HasPrefix(arg, "-m"):
 			// -m64, -march=x86-64
 		case arg == "-arch":
+		case arg == "-target":
 		case strings.HasPrefix(arg, "--target="):
 
 		case strings.HasPrefix(arg, "-no"):
@@ -172,17 +175,19 @@
 
 		case arg == "-o":
 			pathFlag = true
-		case arg == "-I" || arg == "-B" || arg == "-isystem" || arg == "-include":
+		case arg == "-I" || arg == "-B" || arg == "-F" || arg == "-isystem" || arg == "-include":
 			pathFlag = true
 		case arg == "-MF":
 			pathFlag = true
 		case arg == "-isysroot":
 			pathFlag = true
+		case arg == "--sysroot":
+			pathFlag = true
 		case arg == "-idirafter":
 			pathFlag = true
 
 		case strings.HasPrefix(arg, "-"): // unknown flag?
-			return fmt.Errorf("unknown flag: %s", arg)
+			return unknownFlagError{arg: arg}
 
 		default: // input file?
 			if filepath.IsAbs(arg) {
@@ -207,8 +212,13 @@
 				if err != nil {
 					return err
 				}
+			case "as":
+				err := asArgRelocatable(filepath, args)
+				if err != nil {
+					return err
+				}
 			default:
-				return fmt.Errorf("unsupported subcommand args %s: %s", cmd, args)
+				return unknownFlagError{arg: fmt.Sprintf("unsupported subcommand %s: %s", cmd, args)}
 			}
 		}
 	}
@@ -250,7 +260,7 @@
 			pathFlag = true
 		case strings.HasPrefix(arg, "-debug-info-kind="):
 		default:
-			return fmt.Errorf("clang unknown arg: %s", arg)
+			return unknownFlagError{arg: fmt.Sprintf("clang: %s", arg)}
 		}
 	}
 	return nil
@@ -297,7 +307,20 @@
 			// doesn't take a path related value.
 
 		default:
-			return fmt.Errorf("llvm unknown arg: %s", arg)
+			return unknownFlagError{arg: fmt.Sprintf("llvm: %s", arg)}
+		}
+	}
+	return nil
+}
+
+func asArgRelocatable(filepath clientFilePath, args []string) error {
+	for _, arg := range args {
+		switch {
+		case arg == "--fatal-warnings":
+			// b/173641495
+			// https://github.com/llvm/llvm-project/blob/ffc5d98d2c0df5f72ce67e5dcb724b64f03f639b/llvm/lib/MC/MCTargetOptionsCommandFlags.cpp
+		default:
+			return unknownFlagError{arg: fmt.Sprintf("as: %s", arg)}
 		}
 	}
 	return nil
diff --git a/remoteexec/gcc_test.go b/remoteexec/gcc_test.go
index f597f2a..01e51cc 100644
--- a/remoteexec/gcc_test.go
+++ b/remoteexec/gcc_test.go
@@ -12,6 +12,16 @@
 	"go.chromium.org/goma/server/command/descriptor/posixpath"
 )
 
+func TestGccPathFlags(t *testing.T) {
+	lastP := pathFlags[0]
+	for _, p := range pathFlags[1:] {
+		if len(lastP) < len(p) {
+			t.Errorf("%q is longer than %q", p, lastP)
+		}
+		lastP = p
+	}
+}
+
 func TestGccRelocatableReq(t *testing.T) {
 
 	baseReleaseArgs := []string{
@@ -190,6 +200,22 @@
 			relocatable: false,
 		},
 		{
+			desc: "sysroot separate relative",
+			args: append(modifyArgs(baseReleaseArgs,
+				"--sysroot",
+				"--sysroot"),
+				"../../build/linux/debian_sid_amd64-sysroot"),
+			relocatable: true,
+		},
+		{
+			desc: "sysroot separate absolute",
+			args: append(modifyArgs(baseReleaseArgs,
+				"--sysroot",
+				"--sysroot"),
+				"/b/c/b/linux/build/linux/debian_sid_amd64-sysroot"),
+			relocatable: false,
+		},
+		{
 			desc: "llvm -asan option",
 			// https://b/issues/141210713#comment3
 			args: append(append([]string{}, baseReleaseArgs...),
@@ -360,6 +386,24 @@
 			relocatable: true,
 		},
 		{
+			desc: "framework include search path -F.",
+			args: append(append([]string{}, baseReleaseArgs...),
+				"-F."),
+			relocatable: true,
+		},
+		{
+			desc: "framework include search path -F/App/Framework",
+			args: append(append([]string{}, baseReleaseArgs...),
+				"-F/App/Framework"),
+			relocatable: false,
+		},
+		{
+			desc: "-target",
+			args: append(append([]string{}, baseReleaseArgs...),
+				"-target", "x86_64-linux-gnu"),
+			relocatable: true,
+		},
+		{
 			desc: "-mllvm -enable-dse-memoryssa=true",
 			args: append(append([]string{}, baseReleaseArgs...),
 				"-mllvm", "-enable-dse-memoryssa=true"),
@@ -371,6 +415,12 @@
 				"-mllvm", "-enable-dse-memoryssa=false"),
 			relocatable: true,
 		},
+		{
+			desc: "-Wa,--fatal-warnings",
+			args: append(append([]string{}, baseReleaseArgs...),
+				"-Wa,--fatal-warnings"),
+			relocatable: true,
+		},
 	} {
 		t.Run(tc.desc, func(t *testing.T) {
 			err := gccRelocatableReq(posixpath.FilePath{}, tc.args, tc.envs)
diff --git a/remoteexec/gomaoutput.go b/remoteexec/gomaoutput.go
index 20eced5..dd51b8a 100644
--- a/remoteexec/gomaoutput.go
+++ b/remoteexec/gomaoutput.go
@@ -41,8 +41,16 @@
 	gomaFile fpb.FileServiceClient
 }
 
-func retryCAS(ctx context.Context, f func(ctx context.Context) error) error {
-	timeout := 3 * time.Second
+func outputTimeout(size int64) time.Duration {
+	// assume at least 4MB/s
+	t := time.Duration(int64((float64(size) / (4 * 1024 * 1024)) * 1e9))
+	if t < 3*time.Second {
+		return 3 * time.Second
+	}
+	return t
+}
+
+func retryCAS(ctx context.Context, timeout time.Duration, f func(ctx context.Context) error) error {
 	n := 0
 	return rpc.Retry{}.Do(ctx, func() error {
 		n++
@@ -54,51 +62,59 @@
 	})
 }
 
-func (g gomaOutput) stdoutData(ctx context.Context, eresp *rpb.ExecuteResponse) {
+func (g gomaOutput) stdoutData(ctx context.Context, eresp *rpb.ExecuteResponse) error {
 	if len(eresp.Result.StdoutRaw) > 0 {
 		g.gomaResp.Result.StdoutBuffer = eresp.Result.StdoutRaw
-		return
+		return nil
 	}
 	if eresp.Result.StdoutDigest == nil {
-		return
+		return nil
 	}
 	var buf bytes.Buffer
-	err := retryCAS(ctx, func(ctx context.Context) error {
+	err := retryCAS(ctx, outputTimeout(eresp.Result.StdoutDigest.SizeBytes), func(ctx context.Context) error {
 		return cas.DownloadDigest(ctx, g.bs, &buf, g.instance, eresp.Result.StdoutDigest)
 	})
 	if err != nil {
 		logger := log.FromContext(ctx)
 		logger.Errorf("failed to fetch stdout %v: %v", eresp.Result.StdoutDigest, err)
+		if status.Code(err) == codes.Unauthenticated {
+			return err
+		}
 		g.gomaResp.ErrorMessage = append(g.gomaResp.ErrorMessage, fmt.Sprintf("failed to fetch stdout %v: %s", eresp.Result.StdoutDigest, status.Code(err)))
-		return
+		return nil
 	}
 	g.gomaResp.Result.StdoutBuffer = buf.Bytes()
+	return nil
 }
 
-func (g gomaOutput) stderrData(ctx context.Context, eresp *rpb.ExecuteResponse) {
+func (g gomaOutput) stderrData(ctx context.Context, eresp *rpb.ExecuteResponse) error {
 	if len(eresp.Result.StderrRaw) > 0 {
 		g.gomaResp.Result.StderrBuffer = eresp.Result.StderrRaw
-		return
+		return nil
 	}
 	if eresp.Result.StderrDigest == nil {
-		return
+		return nil
 	}
 	var buf bytes.Buffer
-	err := retryCAS(ctx, func(ctx context.Context) error {
+	err := retryCAS(ctx, outputTimeout(eresp.Result.StderrDigest.SizeBytes), func(ctx context.Context) error {
 		return cas.DownloadDigest(ctx, g.bs, &buf, g.instance, eresp.Result.StderrDigest)
 	})
 	if err != nil {
 		logger := log.FromContext(ctx)
 		logger.Errorf("failed to fetch stderr %v: %v", eresp.Result.StdoutDigest, err)
+		if status.Code(err) == codes.Unauthenticated {
+			return err
+		}
 		g.gomaResp.ErrorMessage = append(g.gomaResp.ErrorMessage, fmt.Sprintf("failed to fetch stderr %v: %s", eresp.Result.StderrDigest, status.Code(err)))
-		return
+		return nil
 	}
 	g.gomaResp.Result.StderrBuffer = buf.Bytes()
+	return nil
 }
 
 func (g gomaOutput) outputFileHelper(ctx context.Context, fname string, output *rpb.OutputFile) (*gomapb.ExecResult_Output, error) {
 	var blob *gomapb.FileBlob
-	err := retryCAS(ctx, func(ctx context.Context) error {
+	err := retryCAS(ctx, outputTimeout(output.GetDigest().GetSizeBytes()), func(ctx context.Context) error {
 		var err error
 		blob, err = g.toFileBlob(ctx, output)
 		return err
@@ -111,7 +127,7 @@
 		default:
 			logger.Errorf("goma blob for %s: %v", output.Path, err)
 		}
-		return nil, fmt.Errorf("goma blob for %s: %v", output.Path, status.Code(err))
+		return nil, status.Errorf(status.Code(err), "goma blob for %s: %v", output.Path, status.Code(err))
 	}
 	return &gomapb.ExecResult_Output{
 		Filename:     proto.String(fname),
@@ -120,16 +136,20 @@
 	}, nil
 }
 
-func (g gomaOutput) outputFile(ctx context.Context, fname string, output *rpb.OutputFile) {
+func (g gomaOutput) outputFile(ctx context.Context, fname string, output *rpb.OutputFile) error {
 	result, err := g.outputFileHelper(ctx, fname, output)
 	if err != nil {
+		if status.Code(err) == codes.Unauthenticated {
+			return err
+		}
 		g.gomaResp.ErrorMessage = append(g.gomaResp.ErrorMessage, err.Error())
-		return
+		return nil
 	}
 	g.gomaResp.Result.Output = append(g.gomaResp.Result.Output, result)
+	return nil
 }
 
-func (g gomaOutput) outputFilesConcurrent(ctx context.Context, outputs []*rpb.OutputFile, sema chan struct{}) {
+func (g gomaOutput) outputFilesConcurrent(ctx context.Context, outputs []*rpb.OutputFile, sema chan struct{}) error {
 	var wg sync.WaitGroup
 	results := make([]*gomapb.ExecResult_Output, len(outputs))
 	errs := make([]error, len(outputs))
@@ -154,11 +174,16 @@
 			g.gomaResp.Result.Output = append(g.gomaResp.Result.Output, result)
 		}
 	}
+	var rerr error
 	for _, err := range errs {
 		if err != nil {
+			if status.Code(err) == codes.Unauthenticated {
+				rerr = err
+			}
 			g.gomaResp.ErrorMessage = append(g.gomaResp.ErrorMessage, err.Error())
 		}
 	}
+	return rerr
 }
 
 func toChunkedFileBlob(ctx context.Context, rd io.Reader, size int64, fs fpb.FileServiceClient) (*gomapb.FileBlob, error) {
@@ -197,7 +222,7 @@
 			return err
 		})
 		if err != nil {
-			return nil, fmt.Errorf("store blob failed offset=%d: %v", offset, err)
+			return nil, status.Errorf(status.Code(err), "store blob failed offset=%d: %v", offset, err)
 		}
 		for _, hashKey := range resp.HashKey {
 			if hashKey == "" {
@@ -217,7 +242,7 @@
 		return nil, fmt.Errorf("more bytes were read past end: %d", n)
 	}
 	if err != io.EOF {
-		return nil, fmt.Errorf("could not confirm EOF: %v", err)
+		return nil, status.Errorf(status.Code(err), "could not confirm EOF: %v", err)
 	}
 	return blob, nil
 }
@@ -264,7 +289,7 @@
 
 	blob, err := toChunkedFileBlob(ctx, rd, output.Digest.SizeBytes, g.gomaFile)
 	if err != nil {
-		return nil, fmt.Errorf("Failed to convert %v to chunked FileBlob: %v", output, err)
+		return nil, status.Errorf(status.Code(err), "failed to convert output:{%v} to chunked FileBlob: %v", output, err)
 	}
 	if err = <-casErrCh; err != nil {
 		return nil, err
@@ -304,27 +329,30 @@
 	return result
 }
 
-func (g gomaOutput) outputDirectory(ctx context.Context, filepath clientFilePath, dname string, output *rpb.OutputDirectory, sema chan struct{}) {
+func (g gomaOutput) outputDirectory(ctx context.Context, filepath clientFilePath, dname string, output *rpb.OutputDirectory, sema chan struct{}) error {
 	logger := log.FromContext(ctx)
 	if output.TreeDigest == nil {
 		logger.Warnf("no tree digest in %s", dname)
-		return
+		return nil
 	}
 	var buf bytes.Buffer
-	err := retryCAS(ctx, func(ctx context.Context) error {
+	err := retryCAS(ctx, outputTimeout(output.TreeDigest.SizeBytes), func(ctx context.Context) error {
 		return cas.DownloadDigest(ctx, g.bs, &buf, g.instance, output.TreeDigest)
 	})
 	if err != nil {
 		logger.Errorf("failed to download tree %s: %v", dname, err)
+		if status.Code(err) == codes.Unauthenticated {
+			return err
+		}
 		g.gomaResp.ErrorMessage = append(g.gomaResp.ErrorMessage, fmt.Sprintf("failed to download tree %s: %s", dname, status.Code(err)))
-		return
+		return nil
 	}
 	tree := &rpb.Tree{}
 	err = proto.Unmarshal(buf.Bytes(), tree)
 	if err != nil {
 		logger.Errorf("failed to unmarshal tree data %s: %v", dname, err)
 		g.gomaResp.ErrorMessage = append(g.gomaResp.ErrorMessage, fmt.Sprintf("failed to unmarshal tree data %s: %v", dname, err))
-		return
+		return nil
 	}
 
 	ds := digest.NewStore()
@@ -337,7 +365,7 @@
 		ds.Set(d)
 	}
 	outputFiles := traverseTree(ctx, filepath, dname, tree.Root, ds)
-	g.outputFilesConcurrent(ctx, outputFiles, sema)
+	return g.outputFilesConcurrent(ctx, outputFiles, sema)
 }
 
 // reduceRespSize attempts to reduce the encoded size of `g.gomaResp` to under `byteLimit`.
@@ -375,7 +403,7 @@
 			return err
 		})
 		if err != nil {
-			return nil, fmt.Errorf("store blob failed: %v", err)
+			return nil, status.Errorf(status.Code(err), "store blob failed: %v", err)
 		}
 		if len(resp.HashKey) != 1 {
 			return nil, fmt.Errorf("store blob got len(resp.HashKey)=%d, want=1", len(resp.HashKey))
diff --git a/remoteexec/inputroot.go b/remoteexec/inputroot.go
index 5237c10..e6a37a0 100644
--- a/remoteexec/inputroot.go
+++ b/remoteexec/inputroot.go
@@ -58,6 +58,59 @@
 	return true
 }
 
+func sysrootDir(args []string) (string, bool) {
+	// https://github.com/llvm/llvm-project/blob/1d99472875100b230bac2d9ea70b5cd4b45e788b/clang/include/clang/Driver/Options.td
+	//  def isysroot : JoinedOrSeparate<["-"], "isysroot">, Group<clang_i_Group>, Flags<[CC1Option]>,
+	//     HelpText<"Set the system root directory (usually /)">, MetaVarName<"<dir>">;
+	//  def _sysroot_EQ : Joined<["--"], "sysroot=">;
+	//  def _sysroot : Separate<["--"], "sysroot">, Alias<_sysroot_EQ>;
+	var sysrootDir, isysrootDir string
+	var sysrootFlag, isysrootFlag bool
+	// https://releases.llvm.org/10.0.0/tools/clang/docs/DiagnosticsReference.html#wmissing-sysroot
+	// enabled by default
+	need := true
+	for _, arg := range args {
+		if sysrootFlag {
+			// separated, next arg of --sysroot
+			sysrootDir = arg
+			sysrootFlag = false
+			continue
+		}
+		if isysrootFlag {
+			// separated, next arg of -isysroot
+			isysrootDir = arg
+			isysrootFlag = false
+			continue
+		}
+		switch arg {
+		case "-Wall", "-Wmissing-sysroot":
+			need = true
+		case "-Wno-missing-sysroot":
+			need = false
+		case "-isysroot":
+			isysrootFlag = true
+		case "--sysroot":
+			sysrootFlag = true
+		default:
+			// handled joined.
+			switch {
+			case strings.HasPrefix(arg, "-isysroot"):
+				isysrootDir = strings.TrimPrefix(arg, "-isysroot")
+			case strings.HasPrefix(arg, "--sysroot="):
+				sysrootDir = strings.TrimPrefix(arg, "--sysroot=")
+			}
+		}
+	}
+	// https://gcc.gnu.org/onlinedocs/gcc/Directory-Options.html
+	// If you use both this option and the -isysroot option, then
+	// the --sysroot option applies to libraries, but the
+	// -isysroot option applies to header files.
+	if isysrootDir != "" {
+		return isysrootDir, need
+	}
+	return sysrootDir, need
+}
+
 func inputPaths(filepath clientFilePath, req *gomapb.ExecReq, argv0 string) ([]string, error) {
 	cwd := filepath.Clean(req.GetCwd())
 	if !filepath.IsAbs(cwd) {
@@ -77,23 +130,23 @@
 		}
 		paths = append(paths, filepath.Clean(argv0))
 	}
-	for _, dir := range req.GetCommandSpec().GetCxxSystemIncludePath() {
-		if !filepath.IsAbs(dir) {
-			dir = filepath.Join(cwd, dir)
+	sysrootDir, need := sysrootDir(req.Arg)
+	// if missing sysroot is allowed, no need to ensure it
+	if need && sysrootDir != "" {
+		// if request not allows missing sysroot, we
+		// need to create the directory even if no input files
+		// in dir are used. b/150421328
+
+		// allow relative path only.
+		// if dir is absolute, request would require
+		// InputRootAbsolutePath.
+		// TODO: cwdAgnosticReq should check input file path too.
+		// http://b/167342635
+		// http://crbug.com/1123938
+		if !filepath.IsAbs(sysrootDir) {
+			dir := filepath.Join(cwd, sysrootDir)
+			paths = append(paths, filepath.Clean(dir))
 		}
-		paths = append(paths, filepath.Clean(dir))
-	}
-	for _, dir := range req.GetCommandSpec().GetSystemIncludePath() {
-		if !filepath.IsAbs(dir) {
-			dir = filepath.Join(cwd, dir)
-		}
-		paths = append(paths, filepath.Clean(dir))
-	}
-	for _, dir := range req.GetCommandSpec().GetSystemFrameworkPath() {
-		if !filepath.IsAbs(dir) {
-			dir = filepath.Join(cwd, dir)
-		}
-		paths = append(paths, filepath.Clean(dir))
 	}
 	return paths, nil
 }
@@ -178,9 +231,13 @@
 }
 
 // inputRootDir returns common root of paths.
+// if execRootDir is not empty, use it as root of paths.
 // If second return value is true, chroot must be used.  It become true only
 // if `allowChroot` is true and common input root is "/".
-func inputRootDir(filepath clientFilePath, paths []string, allowChroot bool) (string, bool, error) {
+func inputRootDir(filepath clientFilePath, paths []string, allowChroot bool, execRootDir string) (string, bool, error) {
+	if execRootDir != "" {
+		return execRootDir, execRootDir == "/" && allowChroot, nil
+	}
 	root := commonDir(filepath, paths)
 	if needChroot(filepath, root) && allowChroot {
 		switch filepath.(type) {
diff --git a/remoteexec/inputroot_test.go b/remoteexec/inputroot_test.go
index ec4645a..ed9f9d2 100644
--- a/remoteexec/inputroot_test.go
+++ b/remoteexec/inputroot_test.go
@@ -160,6 +160,7 @@
 		req         *gomapb.ExecReq
 		argv0       string
 		allowChroot bool
+		execRoot    string
 		want        string
 		wantChroot  bool
 		wantPathErr bool
@@ -185,6 +186,29 @@
 			want:  "/b/c/b/linux/src",
 		},
 		{
+			desc: "execRoot",
+			req: &gomapb.ExecReq{
+				Cwd: proto.String("/b/c/b/linux/src/out/Release"),
+				Input: []*gomapb.ExecReq_Input{
+					{
+						Filename: proto.String("../../base/logging.h"),
+					},
+					{
+						Filename: proto.String("../../build/linux/debian_sid_amd64-sysroot/usr/include/stdio.h"),
+					},
+					{
+						Filename: proto.String("gen/chrome/common/buildflags.h"),
+					},
+					{
+						Filename: proto.String("/usr/include/stdio.h"),
+					},
+				},
+			},
+			argv0:    "../../third_party/llvm-build/Release+Asserts/bin/clang++",
+			execRoot: "/b/c/b/linux/src",
+			want:     "/b/c/b/linux/src",
+		},
+		{
 			desc: "abs input path",
 			req: &gomapb.ExecReq{
 				Cwd: proto.String("/b/c/b/linux/src/out/Release"),
@@ -332,6 +356,34 @@
 			allowChroot: true,
 			wantChroot:  true,
 		},
+		{
+			desc: "--sysroot=, but ignore system include paths",
+			req: &gomapb.ExecReq{
+				Arg: []string{
+					"../../third_party/llvm-build/Release+Asserts/bin/clang++",
+					"-Wall",
+					"-Werror",
+					"--sysroot=../../build/linux/debian_sid_amd64-sysroot",
+				},
+				Cwd: proto.String("/b/c/b/chromeos/src/out/Release"),
+				Input: []*gomapb.ExecReq_Input{
+					{
+						Filename: proto.String("../../base/logging.h"),
+					},
+					{
+						Filename: proto.String("gen/chrome/common/buildflags.h"),
+					},
+				},
+				CommandSpec: &gomapb.CommandSpec{
+					SystemIncludePath: []string{
+						"../../build/linux/debian_sid_amd64-sysroot/usr/include",
+						"/usr/include",
+					},
+				},
+			},
+			argv0: "../../third_party/llvm-build/Release+Asserts/bin/clang++",
+			want:  "/b/c/b/chromeos/src",
+		},
 	} {
 		t.Logf("test case: %s", tc.desc)
 		paths, err := inputPaths(posixpath.FilePath{}, tc.req, tc.argv0)
@@ -345,7 +397,7 @@
 		if err != nil {
 			t.Errorf("inputPaths(req, %q)=%v, %v; want nil error", tc.argv0, paths, err)
 		}
-		got, needChroot, err := inputRootDir(posixpath.FilePath{}, paths, tc.allowChroot)
+		got, needChroot, err := inputRootDir(posixpath.FilePath{}, paths, tc.allowChroot, tc.execRoot)
 		if tc.wantRootErr {
 			if err == nil {
 				t.Errorf("inputRootDir(files)=%v, %t, nil; want err", got, needChroot)
diff --git a/remoteexec/nsjail.go b/remoteexec/nsjail.go
index c86532c..537c9cd 100644
--- a/remoteexec/nsjail.go
+++ b/remoteexec/nsjail.go
@@ -15,7 +15,116 @@
 )
 
 const (
-	nsjailRunWrapperScript = `#!/bin/bash
+	nsjailHardeningConfig = `
+name: "hardening by nsjail (seccomp-bpf)"
+mode: ONCE
+# keep_env = true
+mount_proc: true
+# it runs in docker container, so ok to mount / as RO.
+mount <
+ src: "/"
+ dst: "/"
+ is_bind: true
+ rw: false
+ is_dir: true
+>
+mount <
+ dst: "/tmp"
+ fstype: "tmpfs"
+ options: "size=5000000"
+ rw: true
+ is_dir: true
+>
+# input root is per request, so ok to mount it as RW.
+# (does not affect to other requests).
+mount <
+ prefix_src_env: "INPUT_ROOT"
+ src: ""
+ prefix_dst_env: "INPUT_ROOT"
+ dst: ""
+ is_bind: true
+ rw: true
+ is_dir: true
+>
+# default may fail with "File too large"
+rlimit_fsize_type: INF
+rlimit_as_type: INF
+# syscalls used by clang.
+seccomp_string: "ALLOW {"
+seccomp_string: "  access,"
+seccomp_string: "  alarm,"
+seccomp_string: "  arch_prctl,"
+seccomp_string: "  brk,"
+seccomp_string: "  close,"
+seccomp_string: "  clone,"
+seccomp_string: "  connect,"
+seccomp_string: "  dup2,"
+seccomp_string: "  execve,"
+seccomp_string: "  exit_group,"
+seccomp_string: "  fcntl,"
+seccomp_string: "  futex,"
+seccomp_string: "  getcwd,"
+seccomp_string: "  getdents,"
+seccomp_string: "  getdents64,"
+seccomp_string: "  getegid,"
+seccomp_string: "  geteuid,"
+seccomp_string: "  getgid,"
+seccomp_string: "  getpgrp,"
+seccomp_string: "  getpid,"
+seccomp_string: "  getppid,"
+seccomp_string: "  getuid,"
+seccomp_string: "  gettid,"
+seccomp_string: "  getrlimit,"
+seccomp_string: "  ioctl,"
+seccomp_string: "  lseek,"
+seccomp_string: "  mmap,"
+seccomp_string: "  mprotect,"
+seccomp_string: "  mremap,"
+seccomp_string: "  munmap,"
+seccomp_string: "  newfstat,"
+seccomp_string: "  newlstat,"
+seccomp_string: "  newstat,"
+seccomp_string: "  newuname,"
+seccomp_string: "  open,"
+seccomp_string: "  openat,"
+seccomp_string: "  pipe,"
+seccomp_string: "  pipe2,"
+seccomp_string: "  pread64,"
+seccomp_string: "  prlimit64,"
+seccomp_string: "  read,"
+seccomp_string: "  readlink,"
+seccomp_string: "  rename,"
+seccomp_string: "  rt_sigaction,"
+seccomp_string: "  rt_sigprocmask,"
+seccomp_string: "  rt_sigreturn, "
+seccomp_string: "  set_robust_list,"
+seccomp_string: "  set_tid_address,"
+seccomp_string: "  sigaltstack,"
+seccomp_string: "  socket,"
+seccomp_string: "  sysinfo,"
+seccomp_string: "  unlink,"
+seccomp_string: "  vfork,"
+seccomp_string: "  wait4,"
+seccomp_string: "  write,"
+seccomp_string: "  writev"
+seccomp_string: "}"
+seccomp_string: "DEFAULT KILL"
+#seccomp_log: true
+iface_no_lo: true
+`
+	nsjailHardeningWrapperScript = `#!/bin/bash
+export INPUT_ROOT="$(pwd)"
+if [[ "$WORK_DIR" != "" ]]; then
+  cd "${WORK_DIR}"
+fi
+export PWD="$(pwd)"
+# exit 159 -> seccomp violation
+nsjail -q -C "./nsjail.cfg" --cwd "$PWD" \
+       --  \
+       "$@"
+`
+
+	nsjailChrootRunWrapperScript = `#!/bin/bash
 set -e
 
 if [[ "$WORK_DIR" == "" ]]; then
@@ -88,8 +197,8 @@
 
 // nsjailConfig returns nsjail configuration.
 // When you modify followings, please make sure it matches
-// nsjailRunWrapperScript above.
-func nsjailConfig(cwd string, cfp clientFilePath, ts []*gomapb.ToolchainSpec, envs []string) []byte {
+// nsjailChrootRunWrapperScript above.
+func nsjailChrootConfig(cwd string, cfp clientFilePath, ts []*gomapb.ToolchainSpec, envs []string) []byte {
 	chrootWorkdir := "/tmp/goma_chroot"
 	cfg := &nsjailpb.NsJailConfig{
 		Uidmap: []*nsjailpb.IdMap{
diff --git a/remoteexec/nsjail_test.go b/remoteexec/nsjail_test.go
index f9bc831..018d87b 100644
--- a/remoteexec/nsjail_test.go
+++ b/remoteexec/nsjail_test.go
@@ -11,6 +11,7 @@
 
 	"go.chromium.org/goma/server/command/descriptor/posixpath"
 	gomapb "go.chromium.org/goma/server/proto/api"
+	nsjailpb "go.chromium.org/goma/server/proto/nsjail"
 )
 
 func TestPathFromToolchainSpec(t *testing.T) {
@@ -131,3 +132,11 @@
 		})
 	}
 }
+
+func TestNsjailHardeningConfig(t *testing.T) {
+	cfg := &nsjailpb.NsJailConfig{}
+	err := proto.UnmarshalText(nsjailHardeningConfig, cfg)
+	if err != nil {
+		t.Errorf("unmarshal\n%s\n => %v", nsjailHardeningConfig, err)
+	}
+}
diff --git a/remoteexec/stats.go b/remoteexec/stats.go
index b9bb3d3..9703a45 100644
--- a/remoteexec/stats.go
+++ b/remoteexec/stats.go
@@ -25,6 +25,12 @@
 
 	wrapperTypeKey = tag.MustNewKey("wrapper")
 
+	unknownFlagCount = stats.Int64(
+		"go.chromium.org/goma/server/remoteexec.unknown-flags",
+		"Number of requests with unknown flags",
+		stats.UnitDimensionless)
+	compilerNameKey = tag.MustNewKey("compiler")
+
 	inputBufferAllocSize = stats.Int64(
 		"go.chromium.org/goma/server/remoteexec.input-buffer-alloc",
 		"Size to allocate buffer for input files",
@@ -116,6 +122,13 @@
 			Aggregation: view.Count(),
 		},
 		{
+			Measure: unknownFlagCount,
+			TagKeys: []tag.Key{
+				compilerNameKey,
+			},
+			Aggregation: view.Count(),
+		},
+		{
 			Description: "Size to allocate buffer for input files",
 			TagKeys: []tag.Key{
 				allocStatusKey,
diff --git a/server/dial.go b/server/dial.go
index 890978f..39d0fac 100644
--- a/server/dial.go
+++ b/server/dial.go
@@ -10,6 +10,7 @@
 
 	"go.opencensus.io/plugin/ocgrpc"
 	"google.golang.org/grpc"
+	_ "google.golang.org/grpc/encoding/gzip" // also register compressor for server side
 	"google.golang.org/grpc/keepalive"
 )
 
@@ -17,10 +18,12 @@
 func DefaultDialOption() []grpc.DialOption {
 	return []grpc.DialOption{
 		grpc.WithInsecure(),
-		grpc.WithStatsHandler(&ocgrpc.ClientHandler{}),
 		grpc.WithKeepaliveParams(keepalive.ClientParameters{
-			Time: 10 * time.Second,
+			Time:                10 * time.Second,
+			Timeout:             5 * time.Second,
+			PermitWithoutStream: false,
 		}),
+		grpc.WithStatsHandler(&ocgrpc.ClientHandler{}),
 	}
 }
 
diff --git a/server/server.go b/server/server.go
index 85022cd..2568709 100644
--- a/server/server.go
+++ b/server/server.go
@@ -14,9 +14,11 @@
 	"os/signal"
 	"sync"
 	"syscall"
+	"time"
 
 	"go.opencensus.io/plugin/ocgrpc"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/reflection"
 
 	"go.chromium.org/goma/server/log"
@@ -69,6 +71,10 @@
 		return GRPC{}, err
 	}
 	opts = append(opts,
+		grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
+			MinTime:             5 * time.Second,
+			PermitWithoutStream: false,
+		}),
 		grpc.StatsHandler(&ocgrpc.ServerHandler{}),
 		grpc.UnaryInterceptor(func() func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
 			interceptor := log.GRPCUnaryServerInterceptor()