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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2239) BlockPlacementPolicyRaid should call getBlockLocations only when necessary
Date Tue, 04 Jan 2011 01:49:45 GMT
BlockPlacementPolicyRaid should call getBlockLocations only when necessary
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                 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


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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