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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-7186) BackUpNameNode is using 100% CPU and not accepting any requests.
Date Mon, 14 Mar 2011 13:13:29 GMT
 BackUpNameNode is using 100% CPU and not accepting any requests.

                 Key: HADOOP-7186
                 URL: https://issues.apache.org/jira/browse/HADOOP-7186
             Project: Hadoop Common
          Issue Type: Bug
          Components: io, ipc
            Reporter: Uma Maheswara Rao G

In our environment, after 3 days long run Backup NameNode is using 100% CPU and not accepting
any calls. 
*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 we are running into similar issue like this Jetty one. http://jira.codehaus.org/browse/JETTY-937

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