[PR] KAFKA-17734: Reset group state before polling in maybeLeaveGroup [kafka]

["dybyte (via GitHub)" <gi...@apache.org>]

dybyte opened a new pull request, #23512:
URL: https://github.com/apache/kafka/pull/23512

   `maybeLeaveGroup()` polls the network client right after sending LeaveGroup,
   while the member state is still `PREPARING_REBALANCE`. If a JoinGroup response
   of an in-flight rebalance is pending, that poll processes it; when this member
   is elected leader, `onLeaderElected()` waits for a metadata refresh with an
   unbounded timer. With brokers unreachable, `close()` never returns regardless of
   its timeout, and `wakeup()` cannot interrupt it since `close()` disables wakeups.
   
   Reset the state to `UNJOINED` before polling, so the JoinGroup handler discards
   the response instead of driving a rebalance for a member that is leaving.
   
   Added a test that delivers a leader-electing JoinGroup response during the
   LeaveGroup poll with brokers backed off. It hangs on trunk and passes with this
   change.
   
   Co-Authored-By: Claude


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Re: [PR] KAFKA-17734: Reset group state before polling in maybeLeaveGroup [kafka]

["github-actions[bot] (via GitHub)" <gi...@apache.org>]

github-actions[bot] commented on PR #23512:
URL: https://github.com/apache/kafka/pull/23512#issuecomment-5883006343

   A label of 'needs-attention' was automatically added to this PR in order to raise the
   attention of the committers. Once this issue has been triaged, the `triage` label
   should be removed to prevent this automation from happening again.


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