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etcdserver: add watchdog to detect stalled writes
Signed-off-by: Benjamin Wang <wachao@vmware.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| // Copyright 2023 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 watchdog | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| const ( | ||
| tickMs = 100 | ||
| ) | ||
|
|
||
| var ( | ||
| wdInstance *watchdog | ||
| nextActivityId uint64 | ||
| ) | ||
|
|
||
| type activity struct { | ||
| id uint64 | ||
| name string | ||
| inactiveElapsed int | ||
| } | ||
|
|
||
| type watchdog struct { | ||
| lg *zap.Logger | ||
|
|
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| ticker *time.Ticker | ||
| inactiveTimeoutTick int | ||
|
|
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| mu sync.Mutex | ||
| activities map[uint64]*activity | ||
|
|
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| stopC <-chan struct{} | ||
| cleanup func() | ||
| } | ||
|
|
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| func (wd *watchdog) run() { | ||
| inactiveTimeout := time.Duration(wd.inactiveTimeoutTick*tickMs) * time.Millisecond | ||
| wd.lg.Info("Watchdog is running", zap.Duration("inactiveTimeout", inactiveTimeout)) | ||
| for { | ||
| select { | ||
| case <-wd.ticker.C: | ||
| wd.mu.Lock() | ||
| for _, v := range wd.activities { | ||
| v.inactiveElapsed++ | ||
| if v.inactiveElapsed > wd.inactiveTimeoutTick/2 { | ||
| elapsedTime := time.Duration(v.inactiveElapsed*tickMs) * time.Millisecond | ||
| wd.lg.Warn("Slow activity detected", zap.String("activity", v.name), zap.Duration("duration", elapsedTime)) | ||
| if v.inactiveElapsed > wd.inactiveTimeoutTick { | ||
| wd.mu.Unlock() | ||
| wd.cleanup() | ||
| wd.lg.Panic("Inactive activity detected", zap.String("activity", v.name), zap.Duration("duration", elapsedTime)) | ||
| } | ||
| } | ||
| } | ||
| wd.mu.Unlock() | ||
| case <-wd.stopC: | ||
| wd.lg.Info("Watchdog stopped") | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
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| func (wd *watchdog) register(name string) func() { | ||
| wd.mu.Lock() | ||
| defer wd.mu.Unlock() | ||
|
|
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| id := nextActivityId | ||
| wd.activities[nextActivityId] = &activity{ | ||
| id: id, | ||
| name: name, | ||
| inactiveElapsed: 0, | ||
| } | ||
| nextActivityId++ | ||
|
|
||
| return func() { | ||
| wd.reset(id) | ||
| } | ||
| } | ||
|
|
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| func (wd *watchdog) reset(id uint64) { | ||
| wd.mu.Lock() | ||
| defer wd.mu.Unlock() | ||
| delete(wd.activities, id) | ||
| } | ||
|
|
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| func Start(lg *zap.Logger, stopC <-chan struct{}, cleanup func(), inactiveTimeoutMs int64) { | ||
| if wdInstance != nil { | ||
| wdInstance.lg.Warn("Watchdog has already been started") | ||
| return | ||
| } | ||
| wdInstance = &watchdog{ | ||
| lg: lg, | ||
| stopC: stopC, | ||
| cleanup: cleanup, | ||
|
|
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| inactiveTimeoutTick: int(inactiveTimeoutMs / tickMs), | ||
| activities: make(map[uint64]*activity), | ||
| ticker: time.NewTicker(tickMs * time.Millisecond), | ||
| } | ||
| go wdInstance.run() | ||
| } | ||
|
|
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| func Register(name string) func() { | ||
| if wdInstance == nil { | ||
| // watchdog not enabled | ||
| return func() {} | ||
| } | ||
| return wdInstance.register(name) | ||
| } |