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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