[jira] [Commented] (SPARK-24941) Add RDDBarrier.coalesce() function

["Dongjoon Hyun (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-24941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17840933#comment-17840933 ] 

Dongjoon Hyun commented on SPARK-24941:
---------------------------------------

I removed the outdated target version from this issue.

> Add RDDBarrier.coalesce() function
> ----------------------------------
>
>                 Key: SPARK-24941
>                 URL: https://issues.apache.org/jira/browse/SPARK-24941
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 3.1.0
>            Reporter: Xingbo Jiang
>            Priority: Major
>
> https://github.com/apache/spark/pull/21758#discussion_r204917245
> The number of partitions from the input data can be unexpectedly large, eg. if you do
> {code}
> sc.textFile(...).barrier().mapPartitions()
> {code}
> The number of input partitions is based on the hdfs input splits. We shall provide a way in RDDBarrier to enable users to specify the number of tasks in a barrier stage. Maybe something like RDDBarrier.coalesce(numPartitions: Int) .



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