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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2239) BlockPlacementPolicyRaid should call getBlockLocations only when necessary
Date Fri, 14 Jan 2011 02:10:47 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen updated MAPREDUCE-2239:
----------------------------------

    Status: Open  (was: Patch Available)

> 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.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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