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https://issues.apache.org/jira/browse/KAFKA-9525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032763#comment-17032763
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Sophie Blee-Goldman commented on KAFKA-9525:
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Well, the point is we want to be able to trigger a rebalance without removing a
member. That would definitely solve the static membership problem, but we still
want the option to trigger a rebalance as lightweight as possible for KIP-441,
ie without having to revoke all partitions or actually leave the group.
> Allow explicit rebalance triggering on the Consumer
> ---------------------------------------------------
>
> Key: KAFKA-9525
> URL: https://issues.apache.org/jira/browse/KAFKA-9525
> Project: Kafka
> Issue Type: Improvement
> Components: clients
> Reporter: Sophie Blee-Goldman
> Priority: Major
> Labels: needs-kip
>
> Currently the only way to explicitly trigger a rebalance is by unsubscribing
> the consumer. This has two drawbacks: it does not work with static
> membership, and it causes the consumer to revoke all its currently owned
> partitions. Streams relies on being able to enforce a rebalance for its
> version probing upgrade protocol and the upcoming KIP-441, both of which
> should be able to work with static membership and be able to leverage the
> improvements of KIP-429 to no longer revoke all owned partitions.
> We should add an API that will allow users to explicitly trigger a rebalance
> without going through #unsubscribe
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