[SPARK-19693] SET mapreduce.job.reduces automatically converted to spark.sql.shuffle.partitions

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.1.0
• Fix Version/s: 2.2.0
• Component/s: SQL
• Assignee: Yuming Wang
• Reporter: Yuming Wang
• Created: 22/Feb/17 03:18
• Updated: 08/Mar/17 11:42
• Resolved: 08/Mar/17 11:42

Description

How to reproduce:

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)

The SET mapreduce.job.reduces should automatically converted to spark.sql.shuffle.partitions, it's similar to set mapred.reduce.tasks.

Issue Links

• links to: [Github] Pull Request #17020 (wangyum)