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From "Thomas Graves (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-2530) TaskTracker jetty stuck in a tight loop
Date Tue, 24 May 2011 15:22:47 GMT
 TaskTracker jetty stuck in a tight loop
----------------------------------------

                 Key: MAPREDUCE-2530
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2530
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tasktracker
    Affects Versions: 0.20.204.0
            Reporter: Thomas Graves
            Assignee: Thomas Graves


We are seeing some TaskTracker jetty servers stuck in a tight loop. This appears to be related
to Jetty bug 937 (http://jira.codehaus.org/browse/JETTY-937). 

stack trace for this thread 15993(0x3e79) showing a loop in jetty.


"21006965@qtp-11400638-0 - Acceptor0 SelectChannelConnector@0.0.0.0:50060" prio=10 tid=0x08e6d400
nid=0x3e79
runnable [0xaddfb000]
   java.lang.Thread.State: RUNNABLE
        at java.lang.Throwable.fillInStackTrace(Native Method)
        - locked <0xdf2708e8> (a java.io.IOException)
        at java.lang.Throwable.<init>(Throwable.java:196)
        at java.lang.Exception.<init>(Exception.java:41)
        at java.io.IOException.<init>(IOException.java:41)
        at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
        at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
        at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
        at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
        - locked <0xb6524f58> (a sun.nio.ch.Util$1)
        - locked <0xb6524f68> (a java.util.Collections$UnmodifiableSet)
        - locked <0xb6400930> (a sun.nio.ch.EPollSelectorImpl)
        at sun.nio.ch.SelectorImpl.selectNow(SelectorImpl.java:88)
        at org.mortbay.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:652)
        at org.mortbay.io.nio.SelectorManager.doSelect(SelectorManager.java:192)
        at org.mortbay.jetty.nio.SelectChannelConnector.accept(SelectChannelConnector.java:124)
        at org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:708)
        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

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