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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3827) Jobs with empty map-outputs and intermediate compression fail
Date Fri, 25 Jul 2008 12:57:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616880#action_12616880
] 

Hadoop QA commented on HADOOP-3827:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12386848/HADOOP-3827_0_20080724.patch
  against trunk revision 679743.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    -1 core tests.  The patch failed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2950/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2950/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2950/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2950/console

This message is automatically generated.

> Jobs with empty map-outputs and intermediate compression fail
> -------------------------------------------------------------
>
>                 Key: HADOOP-3827
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3827
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.18.0
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 0.18.0
>
>         Attachments: HADOOP-3827_0_20080724.patch
>
>
> The corner case where there are zero map-outputs doesn't pass the codec to the IFile.Writer
leading to un-compressed data and subsequently failure on the reduce when it tries to decompress
that data.
> The straight-forward fix is to pass the codec:
> {noformat}
>            Writer<K, V> writer = new Writer<K, V>(job, finalOut, 
> -                                                 keyClass, valClass, null);
> +                                                 keyClass, valClass, codec);
> {noformat}

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