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Table of Contents
mapred.reduce.tasks
  • Default Value: -1
  • Added In: ?

The default number of reduce tasks per job. Typically set to a prime close to the number of available hosts. Ignored when mapred.job.tracker is "local". Hadoop set this to 1 by default, whereas hive uses -1 as its default value. By setting this property to -1, Hive will automatically figure out what should be the number of reducers.

hive.region.properties
  • Default Value: (empty)
  • Added In: ?

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