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Posted to mapreduce-dev@hadoop.apache.org by "Allen Wittenauer (JIRA)" <ji...@apache.org> on 2014/07/18 19:30:06 UTC
[jira] [Resolved] (MAPREDUCE-332) When assigning tasks to trackers,
the job tracker should try to balance the number of tasks among the
available trackers
[ https://issues.apache.org/jira/browse/MAPREDUCE-332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Allen Wittenauer resolved MAPREDUCE-332.
----------------------------------------
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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