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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1573) Support for 0 reducers in PIPES
Date Mon, 24 Sep 2007 12:07:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529840
] 

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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