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client/v3/ordering/util.go
42 строки
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shaoqin4
clientv3test: add comments for clientv3test
15 ноя 2023, 16:25
15 ноя 2023, 16:25
089165d
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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 import ( "errors" "sync/atomic" clientv3 "go.etcd.io/etcd/client/v3" ) type OrderViolationFunc func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error var ErrNoGreaterRev = errors.New("etcdclient: no cluster members have a revision higher than the previously received revision") func NewOrderViolationSwitchEndpointClosure(c *clientv3.Client) OrderViolationFunc { violationCount := int32(0) return func(_ clientv3.Op, _ clientv3.OpResponse, _ int64) error { // Each request is assigned by round-robin load-balancer's picker to a different // endpoint. If we cycled them 5 times (even with some level of concurrency), // with high probability no endpoint points on a member with fresh data. // TODO: Ideally we should track members (resp.opp.Header) that returned // stale result and explicitly temporarily disable them in 'picker'. if atomic.LoadInt32(&violationCount) > int32(5*len(c.Endpoints())) { return ErrNoGreaterRev } atomic.AddInt32(&violationCount, 1) return nil } }