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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3258) FileOutputFormat should have a method to create custom files under the outputdir with a unique name per task to avoid name collision
Date Tue, 15 Apr 2008 09:55:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12589001#action_12589001

Hadoop QA commented on HADOOP-3258:

-1 overall.  Here are the results of testing the latest attachment 
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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