/
channels_time_ticker.go
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/
channels_time_ticker.go
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// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 proxy
import (
"context"
"sync"
"time"
"go.uber.org/zap"
"github.com/milvus-io/milvus/pkg/log"
"github.com/milvus-io/milvus/pkg/util/typeutil"
)
// ticker can update ts only when the minTs are greater than the ts of ticker, we can use maxTs to update current later
type getPChanStatisticsFuncType func() (map[pChan]*pChanStatistics, error)
// channelsTimeTicker manages the timestamp statistics
type channelsTimeTicker interface {
// start starts the channels time ticker.
start() error
// close closes the channels time ticker.
close() error
// getLastTick returns the last write timestamp of specific pchan.
getLastTick(pchan pChan) (Timestamp, error)
// getMinTsStatistics returns the last write timestamp of all pchans.
getMinTsStatistics() (map[pChan]Timestamp, Timestamp, error)
// getMinTick returns the minimum last write timestamp between all pchans.
getMinTick() Timestamp
}
// make sure channelsTimeTickerImpl implements channelsTimeTicker.
var _ channelsTimeTicker = (*channelsTimeTickerImpl)(nil)
// channelsTimeTickerImpl implements channelsTimeTicker.
type channelsTimeTickerImpl struct {
interval time.Duration // interval to synchronize
minTsStatistics map[pChan]Timestamp // pchan -> min Timestamp
statisticsMtx sync.RWMutex
getStatisticsFunc getPChanStatisticsFuncType
tso tsoAllocator
currents map[pChan]Timestamp
wg sync.WaitGroup
ctx context.Context
cancel context.CancelFunc
defaultTimestamp Timestamp
minTimestamp Timestamp
}
func (ticker *channelsTimeTickerImpl) getMinTsStatistics() (map[pChan]Timestamp, Timestamp, error) {
ticker.statisticsMtx.RLock()
defer ticker.statisticsMtx.RUnlock()
ret := make(map[pChan]Timestamp)
for k, v := range ticker.minTsStatistics {
if v > 0 {
ret[k] = v
}
}
return ret, ticker.defaultTimestamp, nil
}
func (ticker *channelsTimeTickerImpl) initStatistics() {
ticker.statisticsMtx.Lock()
defer ticker.statisticsMtx.Unlock()
for pchan := range ticker.minTsStatistics {
ticker.minTsStatistics[pchan] = 0
}
}
func (ticker *channelsTimeTickerImpl) initCurrents(current Timestamp) {
for pchan := range ticker.currents {
ticker.currents[pchan] = current
}
}
func (ticker *channelsTimeTickerImpl) tick() error {
now, err := ticker.tso.AllocOne(ticker.ctx)
if err != nil {
log.Warn("Proxy channelsTimeTickerImpl failed to get ts from tso", zap.Error(err))
return err
}
stats, err2 := ticker.getStatisticsFunc()
if err2 != nil {
log.Warn("failed to get tt statistics", zap.Error(err))
return nil
}
ticker.statisticsMtx.Lock()
defer ticker.statisticsMtx.Unlock()
ticker.defaultTimestamp = now
minTs := now
for pchan := range ticker.currents {
current := ticker.currents[pchan]
stat, ok := stats[pchan]
if !ok {
delete(ticker.minTsStatistics, pchan)
delete(ticker.currents, pchan)
} else {
if stat.minTs > current {
ticker.minTsStatistics[pchan] = stat.minTs - 1
next := now + Timestamp(Params.ProxyCfg.TimeTickInterval.GetAsDuration(time.Millisecond))
if next > stat.maxTs {
next = stat.maxTs
}
ticker.currents[pchan] = next
}
lastMin := ticker.minTsStatistics[pchan]
if minTs > lastMin {
minTs = lastMin
}
}
}
for pchan, value := range stats {
if value.minTs == typeutil.ZeroTimestamp {
log.Warn("channelsTimeTickerImpl.tick, stats contains physical channel which min ts is zero ",
zap.String("pchan", pchan))
continue
}
_, ok := ticker.currents[pchan]
if !ok {
ticker.minTsStatistics[pchan] = value.minTs - 1
ticker.currents[pchan] = now
}
if minTs > value.minTs-1 {
minTs = value.minTs - 1
}
}
ticker.minTimestamp = minTs
return nil
}
func (ticker *channelsTimeTickerImpl) tickLoop() {
defer ticker.wg.Done()
timer := time.NewTicker(ticker.interval)
defer timer.Stop()
for {
select {
case <-ticker.ctx.Done():
return
case <-timer.C:
err := ticker.tick()
if err != nil {
log.Warn("channelsTimeTickerImpl.tickLoop", zap.Error(err))
}
}
}
}
func (ticker *channelsTimeTickerImpl) start() error {
ticker.initStatistics()
current, err := ticker.tso.AllocOne(ticker.ctx)
if err != nil {
return err
}
ticker.initCurrents(current)
ticker.wg.Add(1)
go ticker.tickLoop()
return nil
}
func (ticker *channelsTimeTickerImpl) close() error {
ticker.cancel()
ticker.wg.Wait()
return nil
}
func (ticker *channelsTimeTickerImpl) getLastTick(pchan pChan) (Timestamp, error) {
ticker.statisticsMtx.RLock()
defer ticker.statisticsMtx.RUnlock()
ts, ok := ticker.minTsStatistics[pchan]
if !ok {
return ticker.defaultTimestamp, nil
}
return ts, nil
}
func (ticker *channelsTimeTickerImpl) getMinTick() Timestamp {
ticker.statisticsMtx.RLock()
defer ticker.statisticsMtx.RUnlock()
// may be zero
return ticker.minTimestamp
}
// newChannelsTimeTicker returns a channels time ticker.
func newChannelsTimeTicker(
ctx context.Context,
interval time.Duration,
pchans []pChan,
getStatisticsFunc getPChanStatisticsFuncType,
tso tsoAllocator,
) *channelsTimeTickerImpl {
ctx1, cancel := context.WithCancel(ctx)
ticker := &channelsTimeTickerImpl{
interval: interval,
minTsStatistics: make(map[pChan]Timestamp),
getStatisticsFunc: getStatisticsFunc,
tso: tso,
currents: make(map[pChan]Timestamp),
ctx: ctx1,
cancel: cancel,
}
for _, pchan := range pchans {
ticker.minTsStatistics[pchan] = 0
ticker.currents[pchan] = 0
}
return ticker
}