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https://issues.apache.org/jira/browse/SPARK-35168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kent Yao reassigned SPARK-35168:
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Assignee: Kent Yao
> mapred.reduce.tasks should be shuffle.partitions not
> adaptive.coalescePartitions.initialPartitionNum
> ----------------------------------------------------------------------------------------------------
>
> Key: SPARK-35168
> URL: https://issues.apache.org/jira/browse/SPARK-35168
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.2, 3.1.1, 3.2.0
> Reporter: Kent Yao
> Assignee: Kent Yao
> Priority: Minor
>
> {code:java}
> spark-sql> set spark.sql.adaptive.coalescePartitions.initialPartitionNum=1;
> spark.sql.adaptive.coalescePartitions.initialPartitionNum 1
> Time taken: 2.18 seconds, Fetched 1 row(s)
> spark-sql> set mapred.reduce.tasks;
> 21/04/21 14:27:11 WARN SetCommand: Property mapred.reduce.tasks is
> deprecated, showing spark.sql.shuffle.partitions instead.
> spark.sql.shuffle.partitions 1
> Time taken: 0.03 seconds, Fetched 1 row(s)
> spark-sql> set spark.sql.shuffle.partitions;
> spark.sql.shuffle.partitions 200
> Time taken: 0.024 seconds, Fetched 1 row(s)
> spark-sql> set mapred.reduce.tasks=2;
> 21/04/21 14:31:52 WARN SetCommand: Property mapred.reduce.tasks is
> deprecated, automatically converted to spark.sql.shuffle.partitions instead.
> spark.sql.shuffle.partitions 2
> Time taken: 0.017 seconds, Fetched 1 row(s)
> spark-sql> set mapred.reduce.tasks;
> 21/04/21 14:31:55 WARN SetCommand: Property mapred.reduce.tasks is
> deprecated, showing spark.sql.shuffle.partitions instead.
> spark.sql.shuffle.partitions 1
> Time taken: 0.017 seconds, Fetched 1 row(s)
> spark-sql>
> {code}
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