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Posted to issues@spark.apache.org by "Manu Zhang (Jira)" <ji...@apache.org> on 2020/06/24 07:38:00 UTC

[jira] [Created] (SPARK-32083) Unnecessary tasks are launched when input is empty with AQE

Manu Zhang created SPARK-32083:
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             Summary: Unnecessary tasks are launched when input is empty with AQE
                 Key: SPARK-32083
                 URL: https://issues.apache.org/jira/browse/SPARK-32083
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Manu Zhang


[https://github.com/apache/spark/pull/28226] meant to avoid launching unnecessary tasks for 0-size partitions when AQE is enabled. However, when all partitions are empty, the number of partitions will be `spark.sql.adaptive.coalescePartitions.initialPartitionNum` and (a lot of) unnecessary tasks are launched in this case.



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