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https://issues.apache.org/jira/browse/MAPREDUCE-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990363#comment-12990363
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Scott Chen commented on MAPREDUCE-2239:
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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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