SERVER-30669 mapReduce on mongos should pass UUID for sharded output collection in MapReduceFinishCommand to shards

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• Closed

SERVER-30781 for mapreduce.shardedfinish with "merge" or "reduce", create temp collection with a random UUID

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• Closed

SERVER-31716 mapReduce can create sharded output collection on shards with wrong UUID if drop/recreate called concurrently

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• Closed