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Comment: Update hive.exec.parallel description for HIVE-8042

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Whether to execute jobs in parallel.  Applies to MapReduce jobs that can run in parallel, for example jobs processing different source tables before a join.  As of Hive 0.14, also applies to move tasks that can run in parallel, for example moving files to insert targets during multi-insert.

hive.exec.parallel.thread.number

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