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Posted to dev@kafka.apache.org by "Boyang Chen (JIRA)" <ji...@apache.org> on 2019/02/05 23:30:00 UTC

[jira] [Created] (KAFKA-7899) Command line tool to invalidate group metadata for clean assignment

Boyang Chen created KAFKA-7899:
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             Summary: Command line tool to invalidate group metadata for clean assignment
                 Key: KAFKA-7899
                 URL: https://issues.apache.org/jira/browse/KAFKA-7899
             Project: Kafka
          Issue Type: New Feature
          Components: consumer, streams
    Affects Versions: 1.1.0
            Reporter: Boyang Chen
            Assignee: Boyang Chen


Right now the group metadata will affect consumers under sticky assignment, since it persists previous topic partition assignment which affects the judgement of consumer leader. Specifically for KStream applications (under 1.1), if we are scaling up the cluster, it is hard to balance the traffic since most tasks would still go to "previous round active" assignments, even though we hope them to move towards other hosts.

It would be preferable to have a tool to invalidate the group metadata stored on broker, so that for sticky assignment we could have a clean start.



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