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https://issues.apache.org/jira/browse/KAFKA-21112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18126745#comment-18126745
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Matthias J. Sax commented on KAFKA-21112:
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Feel free to open an PR.
> Consider adding a assignment verification step for "streams" groups
> -------------------------------------------------------------------
>
> Key: KAFKA-21112
> URL: https://issues.apache.org/jira/browse/KAFKA-21112
> Project: Kafka
> Issue Type: Improvement
> Components: group-coordinator, streams
> Reporter: Matthias J. Sax
> Priority: Major
>
> With https://issues.apache.org/jira/browse/KAFKA-20683, "streams" groups now
> support custom assignors.
> We should consider to add a verification step, that the assignment is
> correct, ie, all tasks are assigned, no task was "invented", and no task
> placement violations.
> This is especially critical, because both the refiner (added for upcoming 4.5
> release to plan warmup tasks) and reconciler might "choke" on an invalid
> assignment.
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