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Posted to mapreduce-issues@hadoop.apache.org by "Scott Chen (JIRA)" <ji...@apache.org> on 2011/02/04 00:08:31 UTC
[jira] Commented: (MAPREDUCE-2239) BlockPlacementPolicyRaid should
call getBlockLocations only when necessary
[ https://issues.apache.org/jira/browse/MAPREDUCE-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990363#comment-12990363 ]
Scott Chen commented on MAPREDUCE-2239:
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[exec] +1 @author. The patch does not contain any @author tags.
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[exec] +1 tests included. The patch appears to include 3 new or modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning messages.
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[exec] +1 javac. The applied patch does not increase the total number of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs (version 1.3.9) warnings.
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[exec] +1 release audit. The applied patch does not increase the total number of release audit warnings.
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[exec] +1 system test framework. The patch passed system test framework compile.
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{code}
> BlockPlacementPolicyRaid should call getBlockLocations only when necessary
> --------------------------------------------------------------------------
>
> Key: MAPREDUCE-2239
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2239
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/raid
> Affects Versions: 0.23.0
> Reporter: Scott Chen
> Assignee: Scott Chen
> Fix For: 0.23.0
>
> Attachments: MAPREDUCE-2239-1.txt, MAPREDUCE-2239-2.txt, MAPREDUCE-2239.txt
>
>
> Currently BlockPlacementPolicyRaid calls getBlockLocations for every chooseTarget().
> This puts pressure on NameNode. We should avoid calling if this file is not raided or a parity file.
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