[jira] [Commented] (MAPREDUCE-6696) Add a configuration to limit the number of map tasks allowed per job.

["zhihai xu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15284250#comment-15284250 ] 

zhihai xu commented on MAPREDUCE-6696:
--------------------------------------

I attached a patch MAPREDUCE-6696.000.patch, which added a configuration "mapreduce.job.max.map" to limit the number of map tasks. The default value is -1, which means no limit.

> Add a configuration to limit the number of map tasks allowed per job.
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6696
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6696
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: job submission
>    Affects Versions: 2.8.0
>            Reporter: zhihai xu
>         Attachments: MAPREDUCE-6696.000.patch
>
>
> Add a configuration "mapreduce.job.max.map" to limit the number of map tasks allowed per job. It will be useful for Hadoop admin to save Hadoop cluster resource by preventing users from submitting big mapreduce jobs. A mapredeuce job with too many mappers may fail with OOM after running for long time. It will be a big waste.



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