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

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13038622#comment-13038622
] 

Thomas Graves commented on MAPREDUCE-2530:
------------------------------------------

There doesn't seem to be a fix for this (atleast in jetty 6), perhaps we can workaround it
by adding a "ping" type servlet to TT and having the health checker script ping it and report
it if it isn't responding.

>  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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