Details
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Bug
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Status: Resolved
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Major
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Resolution: Won't Fix
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None
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None
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None
Description
http://hadoop.apache.org/common/docs/current/mapred_tutorial.html#Reducer
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How Many Reduces?
The right number of reduces seems to be 0.95 or 1.75 multiplied by (<no. of nodes> * mapred.tasktracker.reduce.tasks.maximum).
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Sure, if you only ever run one job on your grid. There should really be a better answer here, especially explaining what the impact is of a high/low number when chaining multiple map/reduce jobs.