tillrohrmann opened a new pull request #13725:
URL: https://github.com/apache/flink/pull/13725
## What is the purpose of the change
We have to trigger the LeaderRetrievalListener notification upon
reconnecting to ZooKeeper
because the NodeCache might not trigger the nodeChanged call if the server
state is the
same as the state cached in the NodeCache. Therefore, we would miss to tell
the listener
that the old leader (before the connection loss) is still the valid leader.
## Verifying this change
- Added
`ZooKeeperLeaderElectionConnectionHandlingTest.testSameLeaderAfterReconnectTriggersListenerNotification`
and
`ZooKeeperLeaderElectionConnectionHandlingTest.testNewLeaderAfterReconnectTriggersListenerNotification`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / no**)**
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (**yes** / no /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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