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From "Ramkumar Vadali (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1819) RaidNode should be smarter in submitting Raid jobs
Date Wed, 29 Sep 2010 19:47:33 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916259#action_12916259
] 

Ramkumar Vadali commented on MAPREDUCE-1819:
--------------------------------------------

ant test-patch:

     [exec] 
     [exec] +1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 16 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec] 
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
     [exec] 
     [exec]     +1 system tests framework.  The patch passed system tests framework compile.
     [exec] 
     [exec] 
     [exec] 
     [exec] 
     [exec] ======================================================================
     [exec] ======================================================================
     [exec]     Finished build.
     [exec] ======================================================================
     [exec] ======================================================================
     [exec] 
     [exec] 


ant-test:

All succeeded except TestUlimit which is not a related failure.

> RaidNode should be smarter in submitting Raid jobs
> --------------------------------------------------
>
>                 Key: MAPREDUCE-1819
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1819
>             Project: Hadoop Map/Reduce
>          Issue Type: Task
>          Components: contrib/raid
>    Affects Versions: 0.20.1
>            Reporter: Ramkumar Vadali
>            Assignee: Ramkumar Vadali
>         Attachments: MAPREDUCE-1819.patch, MAPREDUCE-1819.patch.2, MAPREDUCE-1819.patch.3
>
>
> The RaidNode currently computes parity files as follows:
> 1. Using RaidNode.selectFiles() to figure out what files to raid for a policy
> 2. Using #1 repeatedly for each configured policy to accumulate a list of files. 
> 3. Submitting a mapreduce job with the list of files from #2 using DistRaid.doDistRaid()
> This task addresses the fact that #2 and #3 happen sequentially. The proposal is to submit
a separate mapreduce job for the list of files for each policy and use another thread to track
the progress of the submitted jobs. This will help reduce the time taken for files to be raided.

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