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Posted to mapreduce-issues@hadoop.apache.org by "zhihai xu (JIRA)" <ji...@apache.org> on 2016/05/16 07:48:12 UTC

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

zhihai xu created MAPREDUCE-6696:
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             Summary: 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


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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