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out-of-date ownedPartition in Cooperative protocol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 The reason is the "ownedPartition" is out-of-date,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ownedPartition will be out-of-date.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# So, now, we have out-of-date ownedPartition sent, with unexpected results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out-of-date.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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