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https://issues.apache.org/jira/browse/KAFKA-6029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16791910#comment-16791910
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Jun Rao commented on KAFKA-6029:
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[~hzxa21], do you still plan to work on this? Thanks.
> Controller should wait for the leader migration to finish before ack a
> ControlledShutdownRequest
> ------------------------------------------------------------------------------------------------
>
> Key: KAFKA-6029
> URL: https://issues.apache.org/jira/browse/KAFKA-6029
> Project: Kafka
> Issue Type: Sub-task
> Components: controller, core
> Affects Versions: 1.0.0
> Reporter: Jiangjie Qin
> Assignee: Zhanxiang (Patrick) Huang
> Priority: Major
>
> In the controlled shutdown process, the controller will return the
> ControlledShutdownResponse immediately after the state machine is updated.
> Because the LeaderAndIsrRequests and UpdateMetadataRequests may not have been
> successfully processed by the brokers, the leader migration and active ISR
> shrink may not have done when the shutting down broker proceeds to shut down.
> This will cause some of the leaders to take up to replica.lag.time.max.ms to
> kick the broker out of ISR. Meanwhile the produce purgatory size will grow.
> Ideally, the controller should wait until all the LeaderAndIsrRequests and
> UpdateMetadataRequests has been acked before sending back the
> ControlledShutdownResponse.
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