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https://issues.apache.org/jira/browse/MAPREDUCE-6696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu updated MAPREDUCE-6696:
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Attachment: MAPREDUCE-6696.000.patch
> 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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