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From "Harsh J (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4026) Lower minimum-allocation-mb to sensible defaults
Date Sat, 17 Mar 2012 04:17:41 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13231832#comment-13231832
] 

Harsh J commented on MAPREDUCE-4026:
------------------------------------

Arun,

It is only the min-alloc am changing, not the job defaults (mapreduce.map.memory.mb and such)
which are presently 1024 or higher, and will need a new JIRA if to be lowered as a default
(agree that 128 is too low - either 200 or 512 should be it for those).

I don't think lowering min alloc default would change default job requirements, but will at
least allow folks to pass -D options for memory needs that are lower than 1024 - for more
tasks in parallel.

Or am I missing something?
                
> Lower minimum-allocation-mb to sensible defaults
> ------------------------------------------------
>
>                 Key: MAPREDUCE-4026
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4026
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2, scheduler
>    Affects Versions: 0.23.3
>            Reporter: Harsh J
>            Assignee: Harsh J
>
> The CapacityScheduler's minimum-allocation-mb is set to 1024.
> The FIFO's minimum-allocation-mb meanwhile, is 128.
> I propose changing the formers' minimum to that amount as well. 1024 is way too much
as a default, wastes "slots" on NMs - and I also do not see why CS has to deviate that settings
from the FIFO default.

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