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https://issues.apache.org/jira/browse/KAFKA-5587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086391#comment-16086391
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Rajini Sivaram commented on KAFKA-5587:
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When a cluster is under load, delays in processing (e.g. produce requests) can
cause connections to be muted for a long time, resulting in channel expiry. If
there are staged receives corresponding to an expired channel, a completed
receive may be delivered after the channel is removed from the channel list.
> Processor got uncaught exception: NullPointerException
> ------------------------------------------------------
>
> Key: KAFKA-5587
> URL: https://issues.apache.org/jira/browse/KAFKA-5587
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.10.1.1
> Reporter: Dan
> Assignee: Rajini Sivaram
>
> [2017-07-12 21:56:39,964] ERROR Processor got uncaught exception.
> (kafka.network.Processor)
> java.lang.NullPointerException
> at
> kafka.network.Processor$$anonfun$processCompletedReceives$1.apply(SocketServer.scala:490)
> at
> kafka.network.Processor$$anonfun$processCompletedReceives$1.apply(SocketServer.scala:487)
> at scala.collection.Iterator$class.foreach(Iterator.scala:727)
> at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
> at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
> at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
> at
> kafka.network.Processor.processCompletedReceives(SocketServer.scala:487)
> at kafka.network.Processor.run(SocketServer.scala:417)
> at java.lang.Thread.run(Thread.java:745)
> Anyone knows the cause of this exception? What's the effect of it?
> When this exception occurred, the log also showed that the broker was
> frequently shrinking ISR to itself. Are these two things interrelated?
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