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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1752) Implement getFileBlockLocations in HarFilesystem
Date Sat, 04 Dec 2010 16:42:17 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966835#action_12966835
] 

Hudson commented on MAPREDUCE-1752:
-----------------------------------

Integrated in Hadoop-Mapreduce-trunk-Commit #557 (See [https://hudson.apache.org/hudson/job/Hadoop-Mapreduce-trunk-Commit/557/])
    MAPREDUCE-1752. Implement getFileBlockLocations in HarFilesystem.
(Patrick Kling via dhruba)


> Implement getFileBlockLocations in HarFilesystem
> ------------------------------------------------
>
>                 Key: MAPREDUCE-1752
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1752
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: harchive
>            Reporter: Dmytro Molkov
>            Assignee: Dmytro Molkov
>             Fix For: 0.23.0
>
>         Attachments: MAPREDUCE-1752.2.patch, MAPREDUCE-1752.3.patch, MR-1752.patch
>
>
> To efficiently run map reduce on the data that has been HAR'ed it will be great to actually
implement getFileBlockLocations for a given filename.
> This way the JobTracker will have information about data locality and will schedule tasks
appropriately.
> I believe the overhead introduced by doing lookups in the index files can be smaller
than that of copying data over the wire.
> Will upload the patch shortly, but would love to get some feedback on this. And any ideas
on how to test it are very welcome.

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