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

["Yuming Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-19693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877382#comment-15877382 ] 

Yuming Wang commented on SPARK-19693:
-------------------------------------

I'm working on.

> 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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