mirror of
https://gitee.com/milvus-io/milvus.git
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126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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 datanode
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import (
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"sync"
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"time"
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"go.uber.org/atomic"
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)
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type sendTimeTick func(Timestamp) error
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// mergedTimeTickerSender reduces time ticker sending rate when datanode is doing `fast-forwarding`
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// it makes sure time ticker send at most 10 times a second (1tick/100millisecond)
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// and the last time tick is always sent
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type mergedTimeTickerSender struct {
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ts atomic.Uint64 // current ts value
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cond *sync.Cond // condition to send timeticker
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send sendTimeTick // actual sender logic
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lastSent time.Time
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lastMut sync.RWMutex
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wg sync.WaitGroup
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closeCh chan struct{}
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closeOnce sync.Once
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}
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func newMergedTimeTickerSender(send sendTimeTick) *mergedTimeTickerSender {
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mt := &mergedTimeTickerSender{
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cond: sync.NewCond(&sync.Mutex{}),
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send: send,
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closeCh: make(chan struct{}),
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}
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mt.ts.Store(0) // 0 for not tt send
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mt.wg.Add(2)
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go mt.tick()
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go mt.work()
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return mt
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}
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func (mt *mergedTimeTickerSender) bufferTs(ts Timestamp) {
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mt.ts.Store(ts)
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mt.lastMut.RLock()
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defer mt.lastMut.RUnlock()
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if !mt.lastSent.IsZero() && time.Since(mt.lastSent) > time.Millisecond*100 {
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mt.cond.L.Lock()
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defer mt.cond.L.Unlock()
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mt.cond.Signal()
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}
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}
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func (mt *mergedTimeTickerSender) tick() {
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defer mt.wg.Done()
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// this duration might be configuable in the future
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t := time.Tick(time.Millisecond * 100) // 100 millisecond, 1/2 of rootcoord timetick duration
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for {
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select {
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case <-t:
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mt.cond.L.Lock()
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mt.cond.Signal() // allow worker to check every 0.1s
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mt.cond.L.Unlock()
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case <-mt.closeCh:
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return
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}
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}
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}
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func (mt *mergedTimeTickerSender) isClosed() bool {
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select {
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case <-mt.closeCh:
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return true
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default:
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return false
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}
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}
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func (mt *mergedTimeTickerSender) work() {
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defer mt.wg.Done()
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ts, lastTs := uint64(0), uint64(0)
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for {
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mt.cond.L.Lock()
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if mt.isClosed() {
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mt.cond.L.Unlock()
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return
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}
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mt.cond.Wait()
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ts = mt.ts.Load()
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mt.cond.L.Unlock()
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if ts != lastTs {
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mt.send(ts)
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lastTs = ts
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mt.lastMut.Lock()
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mt.lastSent = time.Now()
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mt.lastMut.Unlock()
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}
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}
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}
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func (mt *mergedTimeTickerSender) close() {
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mt.closeOnce.Do(func() {
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mt.cond.L.Lock()
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close(mt.closeCh)
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mt.cond.Broadcast()
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mt.cond.L.Unlock()
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mt.wg.Wait()
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})
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}
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