[jira] [Commented] (KAFKA-7757) Too many open files after java.io.IOException: Connection to n was disconnected before the response was read

["点儿郎当 (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-7757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725566#comment-16725566 ] 

点儿郎当 commented on KAFKA-7757:
-----------------------------

I have the same problem.500 machines link the cluster of kafka's three nodes. Please help us to find out what the problem is.

> Too many open files after java.io.IOException: Connection to n was disconnected before the response was read
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: KAFKA-7757
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7757
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 2.1.0
>            Reporter: Pedro Gontijo
>            Priority: Major
>         Attachments: server.properties, td1.txt, td2.txt, td3.txt
>
>
> We upgraded from 0.10.2.2 to 2.1.0 (a cluster with 3 brokers)
> After a while (hours) 2 brokers start to throw:
> {code:java}
> java.io.IOException: Connection to NN was disconnected before the response was read
> at org.apache.kafka.clients.NetworkClientUtils.sendAndReceive(NetworkClientUtils.java:97)
> at kafka.server.ReplicaFetcherBlockingSend.sendRequest(ReplicaFetcherBlockingSend.scala:97)
> at kafka.server.ReplicaFetcherThread.fetchFromLeader(ReplicaFetcherThread.scala:190)
> at kafka.server.AbstractFetcherThread.kafka$server$AbstractFetcherThread$$processFetchRequest(AbstractFetcherThread.scala:241)
> at kafka.server.AbstractFetcherThread$$anonfun$maybeFetch$1.apply(AbstractFetcherThread.scala:130)
> at kafka.server.AbstractFetcherThread$$anonfun$maybeFetch$1.apply(AbstractFetcherThread.scala:129)
> at scala.Option.foreach(Option.scala:257)
> at kafka.server.AbstractFetcherThread.maybeFetch(AbstractFetcherThread.scala:129)
> at kafka.server.AbstractFetcherThread.doWork(AbstractFetcherThread.scala:111)
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:82)
> {code}
> File descriptors start to pile up and if I do not restart it throws "Too many open files" and crashes.  
> {code:java}
> ERROR Error while accepting connection (kafka.network.Acceptor)
> java.io.IOException: Too many open files in system
> at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method)
> at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:422)
> at sun.nio.ch.ServerSocketChannelImpl.accept(ServerSocketChannelImpl.java:250)
> at kafka.network.Acceptor.accept(SocketServer.scala:460)
> at kafka.network.Acceptor.run(SocketServer.scala:403)
> at java.lang.Thread.run(Thread.java:748)
> {code}
>  
>  After some hours the issue happens again... It has happened with all brokers, so it is not something specific to an instance.
>  



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