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client/v3/ordering/doc.go
41 строка
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Benjamin Wang
Bump go 1.19: update all the dependencies and go.sum files
22 сен 2022, 03:47
22 сен 2022, 03:47
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// Copyright 2017 The etcd 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 ordering is a clientv3 wrapper that caches response header revisions // to detect ordering violations from stale responses. Users may define a // policy on how to handle the ordering violation, but typically the client // should connect to another endpoint and reissue the request. // // The most common situation where an ordering violation happens is a client // reconnects to a partitioned member and issues a serializable read. Since the // partitioned member is likely behind the last member, it may return a Get // response based on a store revision older than the store revision used to // service a prior Get on the former endpoint. // // First, create a client: // // cli, err := clientv3.New(clientv3.Config{Endpoints: []string{"localhost:2379"}}) // if err != nil { // // handle error! // } // // Next, override the client interface with the ordering wrapper: // // vf := func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error { // return fmt.Errorf("ordering: issued %+v, got %+v, expected rev=%v", op, resp, prevRev) // } // cli.KV = ordering.NewKV(cli.KV, vf) // // Now calls using 'cli' will reject order violations with an error. package ordering