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https://issues.apache.org/jira/browse/HADOOP-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589001#action_12589001
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Hadoop QA commented on HADOOP-3258:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12380151/patch-3258.txt
against trunk revision 645773.
@author +1. The patch does not contain any @author tags.
tests included +1. The patch appears to include 3 new or modified tests.
javadoc -1. The javadoc tool appears to have generated 1 warning messages.
javac +1. The applied patch does not generate any new javac compiler
warnings.
release audit -1. The applied patch generated 203 release audit warnings
(more than the trunk's current 202 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://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2236/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2236/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2236/artifact/trunk/build/test/checkstyle-errors.html
Release audit warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2236/artifact/trunk/current/releaseAuditDiffWarnings.txt
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2236/console
This message is automatically generated.
> FileOutputFormat should have a method to create custom files under the
> outputdir with a unique name per task to avoid name collision
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-3258
> URL: https://issues.apache.org/jira/browse/HADOOP-3258
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Environment: all
> Reporter: Alejandro Abdelnur
> Assignee: Alejandro Abdelnur
> Fix For: 0.18.0
>
> Attachments: patch-3258.txt
>
>
> Currently, if a M/R code creates a file, it is the responsibility of the M/R
> code to avoid file name collisions from different tasks.
> Hadoop should provide an API that creates unique file names based on the task
> type (map or reduce) and the task ID. Similarly to how output files,
> part-#####, are created.
> The proposed patch adds 2 static methods to the {{FileOutputFormat}}
> {nofomat}
> public static String getUniqueName(JobConf conf, String name);
> public static Path getPathForCustomFile(JobConf conf, String name);
> {nofomat}
> The first one adds task type and task ID to the given name.
> The second gives a PATH to a file in the working outputdir using a file name
> namespaced by the first method.
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