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From "Jian He (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-6696) Add a configuration to limit the number of map tasks allowed per job.
Date Fri, 20 May 2016 02:27:12 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-6696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jian He updated MAPREDUCE-6696:
-------------------------------
          Resolution: Fixed
        Hadoop Flags: Reviewed
       Fix Version/s: 2.9.0
    Target Version/s: 2.9.0
              Status: Resolved  (was: Patch Available)

Committed to trunk, branch-2, thanks Zhihai !

> 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
>            Assignee: zhihai xu
>             Fix For: 2.9.0
>
>         Attachments: MAPREDUCE-6696.000.patch, MAPREDUCE-6696.001.patch, MAPREDUCE-6696.002.patch,
MAPREDUCE-6696.003.patch, MAPREDUCE-6696.004.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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