[jira] [Created] (KAFKA-10284) Group membership update due to static member rejoin should be persisted

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

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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