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https://issues.apache.org/jira/browse/MAPREDUCE-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529388#comment-13529388
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Chris Douglas commented on MAPREDUCE-4866:
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The patch is against the 1.x line; the 0.20 line is not actively developed. The
changes to make these longs were in MAPREDUCE-1182.
Pulling a >2GB segment into memory is... optimistic. It's a very specialized
job that would benefit from relaxing this constraint.
> ShuffleRamManager is limited to 2Gb of memory - we should increase that
> -----------------------------------------------------------------------
>
> Key: MAPREDUCE-4866
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4866
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv1
> Affects Versions: 0.20.2
> Environment: linux, 64bits cpu, more than 2Gb of memory for each
> reducer tasks
> Reporter: Varene Olivier
> Priority: Minor
> Labels: patch
> Attachments: M4866-0.patch, MAPREDUCE-4866-INCOMPLETE.patch
>
>
> Inside the org.apache.hadoop.mapred.ReduceTask.java, the *ShuffleRamManager*
> is limited to allocate up to 2Gb of memory during the shuffle phase.
> We should be able to allocate more, to take advantage of the full memory we
> have on servers.
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