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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2020/08/03 12:57:00 UTC
[jira] [Resolved] (SPARK-32083) Unnecessary tasks are launched when
input is empty with AQE
[ https://issues.apache.org/jira/browse/SPARK-32083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan resolved SPARK-32083.
---------------------------------
Fix Version/s: 3.1.0
3.0.1
Resolution: Fixed
Issue resolved by pull request 29321
[https://github.com/apache/spark/pull/29321]
> 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
> Priority: Minor
> Fix For: 3.0.1, 3.1.0
>
>
> [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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