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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1752) Implement getFileBlockLocations in HarFilesystem
Date Tue, 23 Nov 2010 23:00:22 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935104#action_12935104
] 

Dmytro Molkov commented on MAPREDUCE-1752:
------------------------------------------

The patch looks good to me +1.
I guess the main question is does anyone have any objections to the approach in general?

> 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: 0.22.0
>
>         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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