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From "Maytee Chinavanichkit (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (KAFKA-6051) ReplicaFetcherThread should close the ReplicaFetcherBlockingSend earlier on shutdown
Date Wed, 11 Oct 2017 10:45:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-6051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Maytee Chinavanichkit updated KAFKA-6051:
-----------------------------------------
    Comment: was deleted

(was: https://github.com/apache/kafka/pull/4056)

> 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
>            Reporter: Maytee Chinavanichkit
>
> 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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