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https://issues.apache.org/jira/browse/KAFKA-1642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260508#comment-14260508
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Neha Narkhede commented on KAFKA-1642:
--------------------------------------

Thanks for following through on this, [~ewencp]! [~junrao], since you probably 
have most context on this, would you mind reviewing the follow up patch 
(https://reviews.apache.org/r/28582/diff/) so we can close this out?

> [Java New Producer Kafka Trunk] CPU Usage Spike to 100% when network 
> connection is lost
> ---------------------------------------------------------------------------------------
>
>                 Key: KAFKA-1642
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1642
>             Project: Kafka
>          Issue Type: Bug
>          Components: producer 
>    Affects Versions: 0.8.2
>            Reporter: Bhavesh Mistry
>            Assignee: Ewen Cheslack-Postava
>            Priority: Blocker
>             Fix For: 0.8.2
>
>         Attachments: 
> 0001-Initial-CPU-Hish-Usage-by-Kafka-FIX-and-Also-fix-CLO.patch, 
> KAFKA-1642.patch, KAFKA-1642.patch, KAFKA-1642_2014-10-20_17:33:57.patch, 
> KAFKA-1642_2014-10-23_16:19:41.patch
>
>
> I see my CPU spike to 100% when network connection is lost for while.  It 
> seems network  IO thread are very busy logging following error message.  Is 
> this expected behavior ?
> 2014-09-17 14:06:16.830 [kafka-producer-network-thread] ERROR 
> org.apache.kafka.clients.producer.internals.Sender - Uncaught error in kafka 
> producer I/O thread: 
> java.lang.IllegalStateException: No entry found for node -2
> at 
> org.apache.kafka.clients.ClusterConnectionStates.nodeState(ClusterConnectionStates.java:110)
> at 
> org.apache.kafka.clients.ClusterConnectionStates.disconnected(ClusterConnectionStates.java:99)
> at 
> org.apache.kafka.clients.NetworkClient.initiateConnect(NetworkClient.java:394)
> at 
> org.apache.kafka.clients.NetworkClient.maybeUpdateMetadata(NetworkClient.java:380)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:174)
> at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:175)
> at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:115)
> at java.lang.Thread.run(Thread.java:744)
> Thanks,
> Bhavesh



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