milvus/internal/querycoordv2/observers/leader_cache_observer.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 observers
import (
"context"
"sync"
"time"
"go.uber.org/zap"
"github.com/milvus-io/milvus/internal/proto/proxypb"
"github.com/milvus-io/milvus/internal/proto/querypb"
"github.com/milvus-io/milvus/internal/util/proxyutil"
"github.com/milvus-io/milvus/pkg/log"
"github.com/milvus-io/milvus/pkg/util/paramtable"
)
type CollectionShardLeaderCache = map[string]*querypb.ShardLeadersList
// LeaderCacheObserver is to invalidate shard leader cache when leader location changes
type LeaderCacheObserver struct {
wg sync.WaitGroup
proxyManager proxyutil.ProxyClientManagerInterface
stopOnce sync.Once
closeCh chan struct{}
// collections which need to update event
eventCh chan int64
}
func (o *LeaderCacheObserver) Start(ctx context.Context) {
o.wg.Add(1)
go o.schedule(ctx)
}
func (o *LeaderCacheObserver) Stop() {
o.stopOnce.Do(func() {
close(o.closeCh)
o.wg.Wait()
})
}
func (o *LeaderCacheObserver) RegisterEvent(events ...int64) {
for _, event := range events {
o.eventCh <- event
}
}
func (o *LeaderCacheObserver) schedule(ctx context.Context) {
defer o.wg.Done()
for {
select {
case <-ctx.Done():
log.Info("stop leader cache observer due to context done")
return
case <-o.closeCh:
log.Info("stop leader cache observer")
return
case event := <-o.eventCh:
log.Info("receive event, trigger leader cache update", zap.Int64("event", event))
ret := make([]int64, 0)
ret = append(ret, event)
// try batch submit events
eventNum := len(o.eventCh)
if eventNum > 0 {
for eventNum > 0 {
event := <-o.eventCh
ret = append(ret, event)
eventNum--
}
}
o.HandleEvent(ctx, ret...)
}
}
}
func (o *LeaderCacheObserver) HandleEvent(ctx context.Context, collectionIDs ...int64) {
ctx, cancel := context.WithTimeout(ctx, paramtable.Get().QueryCoordCfg.BrokerTimeout.GetAsDuration(time.Second))
defer cancel()
err := o.proxyManager.InvalidateShardLeaderCache(ctx, &proxypb.InvalidateShardLeaderCacheRequest{
CollectionIDs: collectionIDs,
})
if err != nil {
log.Warn("failed to invalidate proxy's shard leader cache", zap.Error(err))
return
}
}
func NewLeaderCacheObserver(
proxyManager proxyutil.ProxyClientManagerInterface,
) *LeaderCacheObserver {
return &LeaderCacheObserver{
proxyManager: proxyManager,
closeCh: make(chan struct{}),
eventCh: make(chan int64, 1024),
}
}