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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