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https://issues.apache.org/jira/browse/MAPREDUCE-1752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934635#action_12934635
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Patrick Kling commented on MAPREDUCE-1752:
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Mahadev/Nicholas, could one of you please have a look at this patch?
ant test-patch results:
{code}
[exec] +1 overall.
[exec]
[exec] +1 @author. The patch does not contain any @author tags.
[exec]
[exec] +1 tests included. The patch appears to include 6 new or
modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs
(version 1.3.9) warnings.
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[exec] +1 release audit. The applied patch does not increase the
total number of release audit warnings.
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[exec] +1 system test framework. The patch passed system test
framework compile.
[exec]
{code}
> 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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