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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5184) OOM in the TaskTracker while serving map outputs
Date Fri, 06 Feb 2009 18:25:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671227#action_12671227
] 

Owen O'Malley commented on HADOOP-5184:
---------------------------------------

Did you get a heap dump? If it happens again, see if you can get one. Of course when heap
runs out, it isn't necessarily related to the task that asked for the straw that broke the
camel's back. 

> OOM in the TaskTracker while serving map outputs
> ------------------------------------------------
>
>                 Key: HADOOP-5184
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5184
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Devaraj Das
>
> Saw this exception in the TT logs:
> 2009-02-06 06:18:08,553 ERROR org.mortbay.log: EXCEPTION
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> 2009-02-06 06:18:11,247 ERROR org.mortbay.log: Error for /mapOutput
> java.lang.OutOfMemoryError: GC overhead limit exceeded
> 2009-02-06 06:18:11,247 ERROR org.mortbay.log: Error for /mapOutput
> java.lang.OutOfMemoryError: Java heap space
>         at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:39)
>         at java.nio.ByteBuffer.allocate(ByteBuffer.java:312)
>         at org.mortbay.io.nio.IndirectNIOBuffer.<init>(IndirectNIOBuffer.java:28)
>         at org.mortbay.jetty.nio.AbstractNIOConnector.newBuffer(AbstractNIOConnector.java:71)
>         at org.mortbay.jetty.AbstractBuffers.getBuffer(AbstractBuffers.java:131)
>         at org.mortbay.jetty.HttpGenerator.addContent(HttpGenerator.java:145)
>         at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:642)
>         at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:577)
>         at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:2879)

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