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From "Harsh J (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-16) Reduce task failed at shuffling time, throwing null pointer exception
Date Sat, 31 Dec 2011 08:50:30 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-16?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Harsh J resolved MAPREDUCE-16.
------------------------------

    Resolution: Not A Problem

This has gone stale, and has not been reported again recently. Was probably fixed at some
point.

We also do not use that particular FS anymore.
                
> Reduce task failed at shuffling time, throwing null pointer exception
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-16
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-16
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Runping Qi
>
> This happened for 0.17.0 branch.
> Here is the stack trace:
> 2008-04-11 13:45:54,171 ERROR org.apache.hadoop.mapred.ReduceTask: Map output copy failure:
java.lang.NullPointerException
> 	at org.apache.hadoop.fs.InMemoryFileSystem$RawInMemoryFileSystem.getFileStatus(InMemoryFileSystem.java:302)
> 	at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:242)
> 	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.copyOutput(ReduceTask.java:853)
> 	at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$MapOutputCopier.run(ReduceTask.java:777)

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