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storage/cacher: waitUntilWatchCacheFreshAndForceAllEvents checks if storage.RequestWatchProgress is supported

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This commit is contained in:
Lukasz Szaszkiewicz 2024-05-14 12:53:43 +02:00
parent 68baa105f0
commit 2db69ae1cd
1 changed files with 8 additions and 3 deletions
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11
staging/src/k8s.io/apiserver/pkg/storage/cacher/cacher.go
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@ -1303,9 +1303,14 @@ func (c *Cacher) getWatchCacheResourceVersion(ctx context.Context, parsedWatchRe
// can wait for events without unnecessary blocking.
func (c *Cacher) waitUntilWatchCacheFreshAndForceAllEvents(ctx context.Context, requestedWatchRV uint64, opts storage.ListOptions) error {
if opts.SendInitialEvents != nil && *opts.SendInitialEvents {
// TODO(p0lyn0mial): adapt the following logic once
// https://github.com/kubernetes/kubernetes/pull/123264 merges
if utilfeature.DefaultFeatureGate.Enabled(features.ConsistentListFromCache) && c.watchCache.notFresh(requestedWatchRV) {
// Here be dragons:
// Since the etcd feature checker needs to check all members
// to determine whether a given feature is supported,
// we may receive a positive response even if the feature is not supported.
//
// In this very rare scenario, the worst case will be that this
// request will wait for 3 seconds before it fails.
if etcdfeature.DefaultFeatureSupportChecker.Supports(storage.RequestWatchProgress) && c.watchCache.notFresh(requestedWatchRV) {
c.watchCache.waitingUntilFresh.Add()
defer c.watchCache.waitingUntilFresh.Remove()
}