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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1950) Jetty Acceptor can stuck TaskTracker forever
Date Tue, 20 Jul 2010 21:40:50 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890464#action_12890464
] 

Scott Chen commented on MAPREDUCE-1950:
---------------------------------------

This is the related JETTY jira

http://jira.codehaus.org/browse/JETTY-1251

> Jetty Acceptor can stuck TaskTracker forever
> --------------------------------------------
>
>                 Key: MAPREDUCE-1950
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1950
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.1
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>
> We have observed some TaskTrackers keep getting blacklisted because of "Too many fetch-failure"
and the logs are full of the following exception.
> There can be lots of these exceptions in one millisecond.
> {code}
> 2010-07-19 15:00:00,146 ERROR org.mortbay.log: EXCEPTION
> java.nio.channels.ClosedSelectorException
>         at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:66)
>         at sun.nio.ch.SelectorImpl.selectNow(SelectorImpl.java:88)
>         at org.mortbay.io.nio.SelectorManager$SelectSet.doSelect(SelectorManager.java:630)
>         at org.mortbay.io.nio.SelectorManager.doSelect(SelectorManager.java:191)
>         at org.mortbay.jetty.nio.SelectChannelConnector.accept(SelectChannelConnector.java:124)
>         at org.mortbay.jetty.AbstractConnector$Acceptor.run(AbstractConnector.java:708)
>         at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> {code}

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