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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-7304) BackUpNameNode is using 100% CPU and not accepting any requests.
Date Thu, 19 May 2011 10:48:47 GMT
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: 0.21.0
            Reporter: ramkrishna.s.vasudevan
             Fix For: 0.20-append

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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