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Posted to mapreduce-dev@hadoop.apache.org by "Scott Chen (JIRA)" <ji...@apache.org> on 2011/01/04 02:49:45 UTC
[jira] Created: (MAPREDUCE-2239) BlockPlacementPolicyRaid should
call getBlockLocations only when necessary
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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