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Name

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Default Value

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Added In

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Description

mapred.reduce.tasks

• Default Value: -1

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• 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: ?

The default filesystem and jobtracker for a region.