[jira] [Created] (KAFKA-13419) sync group failed with retriable error might cause out-of-date ownedPartition in Cooperative protocol

["Luke Chen (Jira)" <ji...@apache.org>]

Luke Chen created KAFKA-13419:
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             Summary: sync group failed with retriable error might cause out-of-date ownedPartition in Cooperative protocol
                 Key: KAFKA-13419
                 URL: https://issues.apache.org/jira/browse/KAFKA-13419
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 3.0.0
            Reporter: Luke Chen
            Assignee: Luke Chen


In KAFKA-13406, we found there's user got stuck when in rebalancing with cooperative sticky assignor. The reason is the "ownedPartition" is out-of-date, and it failed the cooperative assignment validation.

Investigate deeper, I found the root cause is we didn't reset generation and state after sync group fail. In KAFKA-12983, we fixed the issue that the onJoinPrepare is not called in resetStateAndRejoin method. And it causes the ownedPartition not get cleared. But there's another case that the ownedPartition will be out-of-date. Here's the example:
 # consumer A joined and synced group successfully with generation 1
 # New rebalance started with generation 2, consumer A joined successfully, but somehow, consumer A doesn't send out sync group immediately
 # other consumer completed sync group successfully in generation 2, except consumer A.
 # After consumer A send out sync group, the new rebalance start, with generation 3. So consumer A got REBALANCE_IN_PROGRESS error with sync group response
 # When receiving REBALANCE_IN_PROGRESS, we re-join the group, with generation 3, with the assignment (ownedPartition) in generation 1.
 # So, now, we have out-of-date ownedPartition sent, with unexpected results happened

 

We might want to do resetStateAndRejoin when retriable errors happend in *sync group*. Because when we got sync group error, it means, join group passed, and other consumers (and the leader) might already completed this round of rebalance. The assignment distribution this consumer have is already out-of-date.

 

The errors should resetStateAndRejoin in sync group are:
{code:java}
if (exception instanceof UnknownMemberIdException ||
    exception instanceof IllegalGenerationException ||
    exception instanceof RebalanceInProgressException ||
    exception instanceof MemberIdRequiredException)
    continue;
else if (!future.isRetriable())
    throw exception;
{code}



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