Boyang Chen created KAFKA-10284:
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Summary: Group membership update due to static member rejoin
should be persisted
Key: KAFKA-10284
URL: https://issues.apache.org/jira/browse/KAFKA-10284
Project: Kafka
Issue Type: Bug
Components: consumer
Affects Versions: 2.5.0, 2.4.0, 2.3.0, 2.6.0
Reporter: Boyang Chen
Assignee: Boyang Chen
Fix For: 2.6.1
For known static members rejoin, we would update its corresponding member.id
without triggering a new rebalance. This serves the purpose for avoiding
unnecessary rebalance for static membership, as well as fencing purpose if some
still uses the old member.id.
The bug is that we don't actually persist the membership update, so if no
upcoming rebalance gets triggered, this new member.id information will get lost
during group coordinator immigration, thus bringing up the zombie member
identity.
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