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https://issues.apache.org/jira/browse/KAFKA-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210829#comment-16210829
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Maytee Chinavanichkit commented on KAFKA-6051:
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[~junrao] Thank you!
> ReplicaFetcherThread should close the ReplicaFetcherBlockingSend earlier on
> shutdown
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-6051
> URL: https://issues.apache.org/jira/browse/KAFKA-6051
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.0.0, 0.10.0.1, 0.10.1.0, 0.10.1.1, 0.10.2.0,
> 0.10.2.1, 0.11.0.0
> Reporter: Maytee Chinavanichkit
> Assignee: Maytee Chinavanichkit
> Fix For: 1.1.0
>
>
> The ReplicaFetcherBlockingSend works as designed and will blocks until it is
> able to get data. This becomes a problem when we are gracefully shutting down
> a broker. The controller will attempt to shutdown the fetchers and elect new
> leaders. When the last fetch of partition is removed, as part of the
> {{replicaManager.becomeLeaderOrFollower}} call will proceed to shut down any
> idle ReplicaFetcherThread. The shutdown process here can block up to until
> the last fetch request completes. This blocking delay is a big problem
> because the {{replicaStateChangeLock}}, and {{mapLock}} in
> {{AbstractFetcherManager}} is still locked causing latency spikes on multiple
> brokers.
> At this point in time, we do not need the last response as the fetcher is
> shutting down. We should close the leaderEndpoint early during
> {{initiateShutdown()}} instead of after {{super.shutdown()}}.
> For example we see here the shutdown blocked the broker from processing more
> replica changes for ~500 ms
> {code}
> [2017-09-01 18:11:42,879] INFO [ReplicaFetcherThread-0-2], Shutting down
> (kafka.server.ReplicaFetcherThread)
> [2017-09-01 18:11:43,314] INFO [ReplicaFetcherThread-0-2], Stopped
> (kafka.server.ReplicaFetcherThread)
> [2017-09-01 18:11:43,314] INFO [ReplicaFetcherThread-0-2], Shutdown completed
> (kafka.server.ReplicaFetcherThread)
> {code}
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