stats/opentelemetry: restore the changes from #8342 and fix the flaky test. (#8923) Fixes https://github.com/grpc/grpc-go/issues/8700 This PR re-lands the changes from #8342 , which were reverted due to a flaky test. It cherry-picks the original commits and adds a fix for the underlying race condition that caused the test `TestTraceSpan_WithRetriesAndNameResolutionDelay` to flake. **Problem** As mentioned [here](https://github.com/grpc/grpc-go/pull/8715#issuecomment-3581229693), the test was flaky because of a race condition between the load balancing policy creating a ready picker and the RPC attempting to pick a connection. If the picker became ready before the first Pick attempt, the RPC would not be delayed, the "Delayed LB pick complete" event would not be emitted, and the test would fail. **Fix** To solve the race condition, the test now uses a custom stub balancer and returns a blocking picker that guarantees the RPC will wait for a connection. As soon as the RPC attempts to Pick and is confirmed to be in a waiting state, the balancer then provides a valid, "non-blocking" picker, allowing the RPC to succeed. This sequence reliably triggers the `DelayedPickComplete` event. RELEASE NOTES: * stats/opentelemetry: Retry attempts (grpc.previous-rpc-attempts) are now recorded as span attributes for non-transparent client retries. --------- Co-authored-by: vinothkumarr227 <vinothkumarr@google.com>
The Go implementation of gRPC: A high performance, open source, general RPC framework that puts mobile and HTTP/2 first. For more information see the Go gRPC docs, or jump directly into the quick start.
Simply add the following import to your code, and then go [build|run|test] will automatically fetch the necessary dependencies:
import "google.golang.org/grpc"
Note: If you are trying to access
grpc-gofrom China, see the FAQ below.
The golang.org domain may be blocked from some countries. go get usually produces an error like the following when this happens:
$ go get -u google.golang.org/grpc package google.golang.org/grpc: unrecognized import path "google.golang.org/grpc" (https fetch: Get https://google.golang.org/grpc?go-get=1: dial tcp 216.239.37.1:443: i/o timeout)
To build Go code, there are several options:
Set up a VPN and access google.golang.org through that.
With Go module support: it is possible to use the replace feature of go mod to create aliases for golang.org packages. In your project's directory:
go mod edit -replace=google.golang.org/grpc=github.com/grpc/grpc-go@latest go mod tidy go mod vendor go build -mod=vendor
Again, this will need to be done for all transitive dependencies hosted on golang.org as well. For details, refer to golang/go issue #28652.
Please update to the latest version of gRPC-Go using go get google.golang.org/grpc.
The default logger is controlled by environment variables. Turn everything on like this:
$ export GRPC_GO_LOG_VERBOSITY_LEVEL=99 $ export GRPC_GO_LOG_SEVERITY_LEVEL=info
"code = Unavailable desc = transport is closing"This error means the connection the RPC is using was closed, and there are many possible reasons, including:
It can be tricky to debug this because the error happens on the client side but the root cause of the connection being closed is on the server side. Turn on logging on both client and server, and see if there are any transport errors.