[jira] Assigned: (MAPREDUCE-1752) Implement getFileBlockLocations in HarFilesystem

["dhruba borthakur (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur reassigned MAPREDUCE-1752:
-------------------------------------------

    Assignee: Dmytro Molkov

> 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
>            Assignee: Dmytro Molkov
>             Fix For: 0.22.0
>
>
> 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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