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https://issues.apache.org/jira/browse/HADOOP-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529840
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Hudson commented on HADOOP-1573:
--------------------------------
Integrated in Hadoop-Nightly #248 (See
[http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/248/])
> Support for 0 reducers in PIPES
> -------------------------------
>
> Key: HADOOP-1573
> URL: https://issues.apache.org/jira/browse/HADOOP-1573
> Project: Hadoop
> Issue Type: Bug
> Components: pipes
> Affects Versions: 0.14.0
> Reporter: Christian Kunz
> Assignee: Owen O'Malley
> Fix For: 0.15.0
>
> Attachments: pipe-no-reduce.patch
>
>
> Under pipes, when specifying number of reducers to zero, all map tasks fail:
> java.io.IOException: pipe child exception
> at
> org.apache.hadoop.mapred.pipes.Application.abort(Application.java:124)
> at
> org.apache.hadoop.mapred.pipes.PipesMapRunner.run(PipesMapRunner.java:82)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:189)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1763)
> Caused by: java.net.SocketException: Connection reset
> at java.net.SocketInputStream.read(SocketInputStream.java:168)
> at java.net.SocketInputStream.read(SocketInputStream.java:182)
> at java.io.DataInputStream.readByte(DataInputStream.java:248)
> at org.apache.hadoop.io.WritableUtils.readVLong(WritableUtils.java:313)
> at org.apache.hadoop.io.WritableUtils.readVInt(WritableUtils.java:335)
> at
> org.apache.hadoop.mapred.pipes.BinaryProtocol$UplinkReaderThread.run(BinaryProtocol.java:101)
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