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Reduce critical section for watchcache.lock

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This commit is contained in:
Wojciech Tyczyński 2024-05-21 13:58:35 +02:00
parent 834658cb26
commit 202b4ffdf0
1 changed files with 16 additions and 15 deletions
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31
staging/src/k8s.io/apiserver/pkg/storage/cacher/watch_cache.go
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@ -312,25 +312,26 @@ func (w *watchCache) processEvent(event watch.Event, resourceVersion uint64, upd
RecordTime: w.clock.Now(),
}
// We can call w.store.Get() outside of a critical section,
// because the w.store itself is thread-safe and the only
// place where w.store is modified is below (via updateFunc)
// and these calls are serialized because reflector is processing
// events one-by-one.
previous, exists, err := w.store.Get(elem)
if err != nil {
return err
}
if exists {
previousElem := previous.(*storeElement)
wcEvent.PrevObject = previousElem.Object
wcEvent.PrevObjLabels = previousElem.Labels
wcEvent.PrevObjFields = previousElem.Fields
}
if err := func() error {
// TODO: We should consider moving this lock below after the watchCacheEvent
// is created. In such situation, the only problematic scenario is Replace()
// happening after getting object from store and before acquiring a lock.
// Maybe introduce another lock for this purpose.
w.Lock()
defer w.Unlock()
previous, exists, err := w.store.Get(elem)
if err != nil {
return err
}
if exists {
previousElem := previous.(*storeElement)
wcEvent.PrevObject = previousElem.Object
wcEvent.PrevObjLabels = previousElem.Labels
wcEvent.PrevObjFields = previousElem.Fields
}
w.updateCache(wcEvent)
w.resourceVersion = resourceVersion
defer w.cond.Broadcast()