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https://issues.apache.org/jira/browse/MAPREDUCE-3812?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258899#comment-13258899
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Harsh J commented on MAPREDUCE-3812:
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Didn't realize this patch changed the way allocs would get read, or that it was
doing more than just changing default AM memory requirements. Would save me a
lot of work I've otherwise been doing on MAPREDUCE-4026 and MAPREDUCE-4027.
I'll take over this one since it looks to have gone stale. Thanks for revamping
the whole default way of reading the allocs - much simpler way now. No idea why
there was per-scheduler configs before when you can't use more than one
scheduler anyway.
> Change default memory slot sizes to be 1.5GB
> --------------------------------------------
>
> Key: MAPREDUCE-3812
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3812
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mrv2, performance
> Affects Versions: 0.23.0
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
> Attachments: MAPREDUCE-3812-20120205.txt,
> MAPREDUCE-3812-20120206.1.txt, MAPREDUCE-3812-20120206.txt,
> MAPREDUCE-3812.patch, MAPREDUCE-3812.patch
>
>
> After a few performance improvements tracked at MAPREDUCE-3561, like
> MAPREDUCE-3511 and MAPREDUCE-3567, even a 100K maps job can also run within
> 1GB vmem. We earlier increased AM slot size from 1 slot to two slots to work
> around the issues with AM heap. Now that those are fixed, we should go back
> to 1GB.
> This is just a configuration change.
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