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Posted to issues@spark.apache.org by "Yuming Wang (Jira)" <ji...@apache.org> on 2022/08/20 22:42:00 UTC
[jira] [Comment Edited] (SPARK-39915) Dataset.repartition(N) may not create N partitions
[ https://issues.apache.org/jira/browse/SPARK-39915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17582402#comment-17582402 ]
Yuming Wang edited comment on SPARK-39915 at 8/20/22 10:41 PM:
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The reason is that it will return empty local relation since SPARK-35442:
https://github.com/apache/spark/blob/a077701d4cc36a9a6ce898ddd3b4e5fd506f6162/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PropagateEmptyRelation.scala#L129-L130
cc [~ulysses]
was (Author: q79969786):
The reason is that it will return empty local relation since SPARK-35455:
https://github.com/apache/spark/blob/a077701d4cc36a9a6ce898ddd3b4e5fd506f6162/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/PropagateEmptyRelation.scala#L129-L130
cc [~ulysses]
> Dataset.repartition(N) may not create N partitions
> --------------------------------------------------
>
> Key: SPARK-39915
> URL: https://issues.apache.org/jira/browse/SPARK-39915
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Shixiong Zhu
> Priority: Major
>
> Looks like there is a behavior change in Dataset.repartition in 3.3.0. For example, `spark.range(10, 0).repartition(5).rdd.getNumPartitions` returns 5 in Spark 3.2.0, but 0 in Spark 3.3.0.
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