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Posted to mapreduce-dev@hadoop.apache.org by "Dmytro Molkov (JIRA)" <ji...@apache.org> on 2010/05/05 04:02:02 UTC

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

Implement getFileBlockLocations in HarFilesystem
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                 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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