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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3651) When assigning tasks to trackers, the job tracker should try to balance the number of tasks among the available trackers
Date Thu, 26 Jun 2008 22:17:44 GMT
When assigning tasks to trackers, the job tracker should try to balance the number of tasks
among the available trackers
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                 Key: HADOOP-3651
                 URL: https://issues.apache.org/jira/browse/HADOOP-3651
             Project: Hadoop Core
          Issue Type: Improvement
          Components: mapred
    Affects Versions: 0.17.0
            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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