Yuming Wang created SPARK-19693:
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Summary: SET mapreduce.job.reduces automatically converted to
spark.sql.shuffle.partitions
Key: SPARK-19693
URL: https://issues.apache.org/jira/browse/SPARK-19693
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.1.0, 2.2.0
Reporter: Yuming Wang
How to reproduce:
{code}
spark-sql> set spark.sql.shuffle.partitions;
spark.sql.shuffle.partitions 200
Time taken: 7.118 seconds, Fetched 1 row(s)
spark-sql> set mapred.reduce.tasks=10;
spark.sql.shuffle.partitions 10
Time taken: 5.968 seconds, Fetched 1 row(s)
spark-sql> set mapreduce.job.reduces=20;
set mapreduce.job.reduces 20
Time taken: 0.233 seconds, Fetched 1 row(s)
spark-sql> set spark.sql.shuffle.partitions;
spark.sql.shuffle.partitions 10
Time taken: 0.099 seconds, Fetched 1 row(s)
{code}
The {{SET mapreduce.job.reduces}} should automatically converted to
{{spark.sql.shuffle.partitions}}, it's similar to {{set mapred.reduce.tasks}}.
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