Watch Request Blocked When Member Cluster Offline

[xigang]

What happened:

When the member cluster goes offline, there is a scenario where the client's Watch request gets blocked and does not receive pod events.

What you expected to happen:

Should we set a timeout: Set a reasonable timeout for cache.Watch() calls using context.WithTimeout or context.WithDeadline to control the operation time?

https://github.com/karmada-io/karmada/blob/master/pkg/search/proxy/store/multi_cluster_cache.go#L354

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Karmada version:
• kubectl-karmada or karmadactl version (the result of kubectl-karmada version or karmadactl version):
• Others: