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https://issues.apache.org/jira/browse/HADOOP-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528694
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Hadoop QA commented on HADOOP-1573:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12366154/pipe-no-reduce.patch
against trunk revision r577171.
@author +1. The patch does not contain any @author tags.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new compiler warnings.
findbugs +1. The patch does not introduce any new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/789/testReport/
Findbugs warnings:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/789/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/789/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/789/console
This message is automatically generated.
> 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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