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https://issues.apache.org/jira/browse/SPARK-19693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen reassigned SPARK-19693:
---------------------------------
Assignee: Yuming Wang
Affects Version/s: (was: 2.2.0)
Priority: Minor (was: Major)
> 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
> Reporter: Yuming Wang
> Assignee: Yuming Wang
> Priority: Minor
> Fix For: 2.2.0
>
>
> 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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