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https://issues.apache.org/jira/browse/KAFKA-2720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15332949#comment-15332949
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ASF GitHub Bot commented on KAFKA-2720:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1427
> Periodic purging groups in the coordinator
> ------------------------------------------
>
> Key: KAFKA-2720
> URL: https://issues.apache.org/jira/browse/KAFKA-2720
> Project: Kafka
> Issue Type: Sub-task
> Components: consumer
> Reporter: Guozhang Wang
> Assignee: Jason Gustafson
> Fix For: 0.10.1.0
>
>
> Currently the coordinator removes the group (i.e. both removing it from the
> cache and writing the tombstone message on its local replica without waiting
> for ack) once it becomes an empty group.
> This can lead to a few issues such as 1) group removal and creation churns
> when a group with very few members are being rebalanced, 2) if the local
> write is failed / not propagated to other followers, they can only be removed
> again when a new coordinator is migrated and detects the group has no members
> already.
> We could instead piggy-back the periodic offset expiration along with the
> group purging as well which removes any groups that had no corresponding
> offsets in the cache any more.
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