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https://issues.apache.org/jira/browse/HADOOP-3651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12609598#action_12609598
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Runping Qi commented on HADOOP-3651:
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Not sure how the original cases were produced.
I'll get more details if I encounter the same problem in the future.
> When assigning tasks to trackers, the job tracker should try to balance the
> number of tasks among the available trackers
> ------------------------------------------------------------------------------------------------------------------------
>
> 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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