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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3812) Lower default allocation sizes, fix allocation configurations and document them
Date Thu, 03 May 2012 12:50:51 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Harsh J updated MAPREDUCE-3812:

    Target Version/s: 2.0.0, trunk  (was: trunk, 2.0.0)
        Release Note: 
Removed two sets of previously available config properties:

1. ( yarn.scheduler.fifo.minimum-allocation-mb and yarn.scheduler.fifo.maximum-allocation-mb
) and,
2. ( yarn.scheduler.capacity.minimum-allocation-mb and yarn.scheduler.capacity.maximum-allocation-mb

In favor of two new, generically named properties:

1. yarn.scheduler.minimum-allocation-mb - This acts as the floor value of memory resource
requests for containers.
2. yarn.scheduler.maximum-allocation-mb - This acts as the ceiling value of memory resource
requests for containers.

Both these properties need to be set at the ResourceManager (RM) to take effect, as the RM
is where the scheduler resides.

Also changes the default minimum and maximums to 128 MB and 10 GB respectively.
> Lower default allocation sizes, fix allocation configurations and document them
> -------------------------------------------------------------------------------
>                 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: Harsh J
>             Fix For: 0.23.3, 2.0.0, 3.0.0
>         Attachments: MAPREDUCE-3812-20120205.txt, MAPREDUCE-3812-20120206.1.txt, MAPREDUCE-3812-20120206.txt,
MAPREDUCE-3812.patch, MAPREDUCE-3812.patch, MAPREDUCE-3812.patch, 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.
> [P.s.]:
> - Currently min/max alloc is set at a per-scheduler config level, which makes no sense
as there's no way to run multiple schedulers anyway. Switch configs to use a generic RM-config.
> - The min/max alloc configs aren't documented and we ought to document it (i.e. MAPREDUCE-4027)
> - 1 GB is perhaps too high for a slot's minimum. While job defaults can be left at such
values, we should lower the minimum alloc to 128 MB to allow special requests of low memory
out of the box itself. Shouldn't impact MR App in any way.

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