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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/11/17 14:48:00 UTC

[jira] [Assigned] (SPARK-37357) Add merged last partition factor for rebalance

     [ https://issues.apache.org/jira/browse/SPARK-37357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-37357:
------------------------------------

    Assignee:     (was: Apache Spark)

> Add merged last partition factor for rebalance
> ----------------------------------------------
>
>                 Key: SPARK-37357
>                 URL: https://issues.apache.org/jira/browse/SPARK-37357
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: XiDuo You
>            Priority: Major
>
> `Rebalance` provide a functionality that split the large reduce partition into smalls. However we have seen many SQL produce small files due to the last partition.
> Let's say we have one reduce partition and three map partitions and the blocks are: [10, 10, 10, 10, 10, 10]. If the target size is 50, we will get two files with 50 and 10. And it will get worse if there are thousands of reduce partitions.
> It should be helpful if we can merge the last small partition into previous.



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