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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-7304) BackUpNameNode is using 100% CPU and not accepting any requests.
Date Thu, 15 Sep 2011 09:16:08 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Uma Maheswara Rao G resolved HADOOP-7304.
-----------------------------------------

    Resolution: Duplicate

> BackUpNameNode is using 100% CPU and not accepting any requests. 
> -----------------------------------------------------------------
>
>                 Key: HADOOP-7304
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7304
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.23.0
>            Reporter: ramkrishna.s.vasudevan
>
> In our environment, Backup NameNode is using 100% CPU and not accepting any calls in
3days long run.
> Thread dump 
> "IPC Server Responder" daemon prio=10 tid=0x00007f86c41c6800 nid=0x3b2a runnable [0x00007f86ce579000]
> java.lang.Thread.State: RUNNABLE
> at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
> at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:215)
> at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
> at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69) 
> locked <0x00007f86d67e2a20> (a sun.nio.ch.Util$1) 
> locked <0x00007f86d67e2a08> (a java.util.Collections$UnmodifiableSet) 
> locked <0x00007f86d67e26a8> (a sun.nio.ch.EPollSelectorImpl)
> at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:501) 
> Looks like same issue occurred in jetty also. http://jira.codehaus.org/browse/JETTY-937

>  

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