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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-332) When assigning tasks to trackers, the job tracker should try to balance the number of tasks among the available trackers
Date Fri, 18 Jul 2014 17:30:06 GMT

     [ 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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