[jira] Updated: (HADOOP-1573) Support for 0 reducers in PIPES

["Owen O'Malley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Owen O'Malley updated HADOOP-1573:
----------------------------------

    Attachment: pipe-no-reduce.patch

This patch fixes the problem and adds a unit test to ensure that it works.

> 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
>             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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