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https://issues.apache.org/jira/browse/MAPREDUCE-1379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800613#action_12800613
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Bochun Bai commented on MAPREDUCE-1379:
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Tang, this helps lower the number of concurrent tasks running by each task
tracker.
some of my machine is shared with other service, running 1 mapper and 1 reducer
is not good enough.
> Limit both numMapTasks and numReduceTasks
> -----------------------------------------
>
> Key: MAPREDUCE-1379
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1379
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: tasktracker
> Affects Versions: 0.22.0
> Reporter: Bochun Bai
> Priority: Trivial
> Attachments: limit-both-numMapTasks-and-numReduceTasks.patch
>
>
> In some environment, the number of concurrent running process is very
> sensitive.
> mapreduce.tasktracker.map.tasks.maximum
> and
> mapreduce.tasktracker.reduce.tasks.maximum
> limit tasks running on each tasktracker separately.
> This patch limits them together, using
> mapreduce.tasktracker.total.tasks.maximum
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