mirror of
https://github.com/etcd-io/etcd.git
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43 lines
1.6 KiB
Go
43 lines
1.6 KiB
Go
// Copyright 2017 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ordering
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import (
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"errors"
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"sync/atomic"
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clientv3 "go.etcd.io/etcd/client/v3"
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)
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type OrderViolationFunc func(op clientv3.Op, resp clientv3.OpResponse, prevRev int64) error
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var ErrNoGreaterRev = errors.New("etcdclient: no cluster members have a revision higher than the previously received revision")
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func NewOrderViolationSwitchEndpointClosure(c *clientv3.Client) OrderViolationFunc {
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violationCount := int32(0)
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return func(_ clientv3.Op, _ clientv3.OpResponse, _ int64) error {
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// Each request is assigned by round-robin load-balancer's picker to a different
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// endpoint. If we cycled them 5 times (even with some level of concurrency),
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// with high probability no endpoint points on a member with fresh data.
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// TODO: Ideally we should track members (resp.opp.Header) that returned
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// stale result and explicitly temporarily disable them in 'picker'.
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if atomic.LoadInt32(&violationCount) > int32(5*len(c.Endpoints())) {
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return ErrNoGreaterRev
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}
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atomic.AddInt32(&violationCount, 1)
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return nil
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}
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}
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