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Date: Fri, 11 Jun 2010 07:42:15 -0400 (EDT)
From: "Vinod K V (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Updated: (MAPREDUCE-1813) NPE in PipeMapred.MRErrorThread
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     [ https://issues.apache.org/jira/browse/MAPREDUCE-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod K V updated MAPREDUCE-1813:
---------------------------------

          Status: Resolved  (was: Patch Available)
    Release Note: Fixed an NPE in streaming that occurs when there is no input to reduce and the streaming reducer sends status updates by writing "reporter:status: xxx" statements to stderr.
      Resolution: Fixed

I just committed this to trunk. Thanks Ravi!

> NPE in PipeMapred.MRErrorThread
> -------------------------------
>
>                 Key: MAPREDUCE-1813
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1813
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/streaming
>    Affects Versions: 0.20.1
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Ravi Gummadi
>             Fix For: 0.22.0
>
>         Attachments: 1813.patch, 1813.v1.2.patch, 1813.v1.3.patch, 1813.v1.4.patch, 1813.v1.patch
>
>
> Some reduce tasks fail with following NPE
> java.lang.RuntimeException: java.lang.NullPointerException
>         at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:325)
>         at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:540)
>         at org.apache.hadoop.streaming.PipeReducer.close(PipeReducer.java:137)
>         at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:474)
>         at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:412)
>         at org.apache.hadoop.mapred.Child.main(Child.java:159)
> Caused by: java.lang.NullPointerException
>        at org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.setStatus(PipeMapRed.java:517)
>         at org.apache.hadoop.streaming.PipeMapRed$MRErrorThread.run(PipeMapRed.java:449)

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