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Posted to mapreduce-issues@hadoop.apache.org by "Scott Chen (JIRA)" <ji...@apache.org> on 2011/01/14 01:24:45 UTC

[jira] Updated: (MAPREDUCE-2239) BlockPlacementPolicyRaid should call getBlockLocations only when necessary

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

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

    Attachment: MAPREDUCE-2239.txt

> 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.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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