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Comment: Added information on hive.execution.engine

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Chooses execution engine. Options are: mr (Map reduce, default) or , tez (Tez execution, for Hadoop 2 only), or spark (Spark execution, for Hive 1.1.0 onward).

See Hive on Tez and Hive on Spark for more information, and see the Tez section and the Spark section below for Tez their configuration properties.

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