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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1950) Jetty Acceptor can stuck TaskTracker forever
Date Mon, 19 Jul 2010 23:09:49 GMT
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


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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