FAQ
[ https://issues.apache.org/jira/browse/HADOOP-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673559#action_12673559 ]

Hadoop QA commented on HADOOP-4927:
-----------------------------------

-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12400180/hadoop-4927-v5.patch
against trunk revision 744406.

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

+1 tests included. The patch appears to include 14 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 Eclipse classpath. The patch retains Eclipse classpath integrity.

+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/3859/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3859/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3859/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/3859/console

This message is automatically generated.
Part files on the output filesystem are created irrespective of whether the corresponding task has anything to write there
--------------------------------------------------------------------------------------------------------------------------

Key: HADOOP-4927
URL: https://issues.apache.org/jira/browse/HADOOP-4927
Project: Hadoop Core
Issue Type: New Feature
Components: mapred
Reporter: Devaraj Das
Assignee: Jothi Padmanabhan
Fix For: 0.21.0

Attachments: hadoop-4927-v1.patch, hadoop-4927-v2.patch, hadoop-4927-v3.patch, hadoop-4927-v4.patch, hadoop-4927-v5.patch, hadoop-4927.patch


When OutputFormat.getRecordWriter is invoked, a part file is created on the output filesystem. But the created RecordWriter is not used until the OutputCollector.collect call is made by the task (user's code). This results in empty part files even if the OutputCollector.collect is never invoked by the corresponding tasks.
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postedDec 22, '08 at 6:01a
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