[SPARK-7277][SQL] Throw exception if the property mapred.reduce.tasks is set to -1#5811

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viirya wants to merge 4 commits intoapache:masterfrom

viirya:no_neg_reduce_tasks

Commits on Apr 30, 2015

Show warning message if mapred.reduce.tasks is set to -1.
viirya
committed

Commits on May 1, 2015

Throw exception instead of warning message.
viirya
committed

Commits on May 4, 2015