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Date: Tue, 23 Feb 2010 12:04:27 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1510) RAID should regenerate parity
 files if they get deleted
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837212#action_12837212 ] 

Hadoop QA commented on MAPREDUCE-1510:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12436685/MAPREDUCE-1510.1.patch
  against trunk revision 915223.

    +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 failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/476/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/476/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/476/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/476/console

This message is automatically generated.

> RAID should regenerate parity files if they get deleted
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-1510
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1510
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/raid
>            Reporter: Rodrigo Schmidt
>            Assignee: Rodrigo Schmidt
>         Attachments: MAPREDUCE-1510.1.patch, MAPREDUCE-1510.patch
>
>
> Currently, if a source file has a replication factor lower or equal to that expected by RAID, the file is skipped and no parity file is generated. I don't think this is a good behavior since parity files can get wrongly deleted, leaving the source file with a low replication factor. In that case, raid should be able to recreate the parity file.

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