Brock Noland created HIVE-8649:
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Summary: Increase level of parallelism
Key: HIVE-8649
URL: https://issues.apache.org/jira/browse/HIVE-8649
Project: Hive
Issue Type: Sub-task
Reporter: Brock Noland
We calculate the number of reducers based on the same code for MapReduce.
However, reducers are vastly cheaper in Spark and it's generally recommended we
have many more reducers than in MR.
Sandy Ryza who works on Spark has some ideas about a heuristic.
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