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https://issues.apache.org/jira/browse/MAPREDUCE-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated MAPREDUCE-3902:
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Attachment: MAPREDUCE-3902.patch
Ok, I spent a long (isolated) flight on this - it clearly needs more work, but
it's a start. *smile*
This patch improves the classic JVM re-use on both dimensions described in the
jira.
We need to pay more attention to the user interface, some options:
# Allow user to specify actual number of map slots to be used (supported now,
in the patch)
# Allow user to specify a target block-size for maps (which is greater than
real HDFS block size) i.e. get around the small-files problem.
Thoughts?
> MR AM should reuse containers for map tasks
> -------------------------------------------
>
> Key: MAPREDUCE-3902
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3902
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: applicationmaster, mrv2
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Attachments: MAPREDUCE-3902.patch
>
>
> The MR AM is now in a great position to reuse containers across (map) tasks.
> This is something similar to JVM re-use we had in 0.20.x, but in a
> significantly better manner:
> # Consider data-locality when re-using containers
> # Consider the new shuffle - ensure that reduces fetch output of the whole
> container at once (i.e. all maps)
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