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https://issues.apache.org/jira/browse/MAPREDUCE-332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Allen Wittenauer resolved MAPREDUCE-332.
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Resolution: Incomplete
Closing as stale.
> When assigning tasks to trackers, the job tracker should try to balance the
> number of tasks among the available trackers
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-332
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-332
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Runping Qi
>
> I encounter a number of situations like this:
> A job tracker has 200 task trackers, each with 2 mapper slots and reducer
> slots.
> When a job with 200 or fewer reducers was submitted to the job tracker,
> one normally each task tracker will run one reducer.
> Unfortunately, it seems that only about 1/3 of trackers have one reducer,
> and 1/3 trackers don't have reducer, and 1/3 have 2 reducers!
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