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From "Nigel Daley (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-974) NPE in SocketChannelOutputStream during large sort benchmark
Date Mon, 05 Feb 2007 07:44:05 GMT
NPE in SocketChannelOutputStream during large sort benchmark
------------------------------------------------------------

                 Key: HADOOP-974
                 URL: https://issues.apache.org/jira/browse/HADOOP-974
             Project: Hadoop
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.11.0
            Reporter: Nigel Daley


Running sort benchmark, I saw this NPE trace in the JobTracker log

...
2007-02-04 02:07:23,753 INFO org.apache.hadoop.mapred.JobInProgress: Already complete TIP
tip_0002_m_032689 has completed task task_0002_m_032689_2
2007-02-04 02:07:23,753 INFO org.apache.hadoop.mapred.TaskInProgress: Task 'task_0002_m_032689_2'
has completed.
2007-02-04 02:07:24,566 WARN org.apache.hadoop.ipc.Server: handler output errorjava.io.IOException:
Connection reset by peer
        at sun.nio.ch.FileDispatcher.write0(Native Method)
        at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29)
        at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:104)
        at sun.nio.ch.IOUtil.write(IOUtil.java:75)
        at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:302)
        at org.apache.hadoop.ipc.SocketChannelOutputStream.flushBuffer(SocketChannelOutputStream.java:108)
        at org.apache.hadoop.ipc.SocketChannelOutputStream.write(SocketChannelOutputStream.java:89)
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
        at java.io.DataOutputStream.flush(DataOutputStream.java:106)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:556)
2007-02-04 02:07:24,569 WARN org.apache.hadoop.ipc.Server: handler output error
java.lang.NullPointerException
        at org.apache.hadoop.ipc.SocketChannelOutputStream.flushBuffer(SocketChannelOutputStream.java:108)
        at org.apache.hadoop.ipc.SocketChannelOutputStream.write(SocketChannelOutputStream.java:89)
        at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
        at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
        at java.io.DataOutputStream.flush(DataOutputStream.java:106)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:556)
2007-02-04 02:07:32,510 INFO org.apache.hadoop.mapred.JobInProgress: Task 'task_0002_m_077715_2'
has completed tip_0002_m_077715 successfully.
...


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