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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1752) Implement getFileBlockLocations in HarFilesystem
Date Wed, 05 May 2010 04:58:03 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864148#action_12864148
] 

dhruba borthakur commented on MAPREDUCE-1752:
---------------------------------------------

Sounds like a good idea. +1

The idea is to make the contents of a Har file work well with FileInputFormat or CombineFileInputFormat,
isn't it? In that case, you can see TestCombineFileInputFormat and see if u can extend it
to test the case when the input file(s) are har files.

> Implement getFileBlockLocations in HarFilesystem
> ------------------------------------------------
>
>                 Key: MAPREDUCE-1752
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1752
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Dmytro Molkov
>
> 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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