| // Copyright 2018 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // Package dsmapper implements a simple Datastore mapper. |
| // |
| // It provides a way to apply some function to all datastore entities of some |
| // particular kind, in parallel, but with bounded concurrency (to avoid burning |
| // through all CPU/Datastore quota at once). This may be useful when examining |
| // or mutating large amounts of datastore entities. |
| // |
| // It works by splitting the range of keys into N shards, and launching N worker |
| // tasks that each sequentially processes a shard assigned to it, slice by |
| // slice. |
| package dsmapper |
