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https://issues.apache.org/jira/browse/KAFKA-6304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773394#comment-16773394
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GEORGE LI commented on KAFKA-6304:
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[KIP-236|https://cwiki.apache.org/confluence/display/KAFKA/KIP-236%3A+Interruptible+Partition+Reassignment]
is addressing the cancel/rollback of pending reassignments.
WIP: KAFKA-6359
Github Pull Request#: [6296|https://github.com/apache/kafka/pull/6296]
> The controller should allow updating the partition reassignment for the
> partitions being reassigned
> ---------------------------------------------------------------------------------------------------
>
> Key: KAFKA-6304
> URL: https://issues.apache.org/jira/browse/KAFKA-6304
> Project: Kafka
> Issue Type: Improvement
> Components: controller, core
> Affects Versions: 1.0.0
> Reporter: Jiangjie Qin
> Priority: Major
>
> Currently the controller will not process the partition reassignment of a
> partition if the partition is already being reassigned.
> The issue is that if there is a broker failure during the partition
> reassignment, the partition reassignment may never finish. And the users may
> want to cancel the partition reassignment. However, the controller will
> refuse to do that unless user manually deletes the partition reassignment zk
> path, force a controller switch and then issue the revert command. This is
> pretty involved. It seems reasonable for the controller to replace the
> ongoing stuck reassignment and replace it with the updated partition
> assignment.
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