[jira] [Commented] (SPARK-23389) When the shuffle dependency specifies aggregation ,and `dependency.mapSideCombine=false`, we should be able to use serialized sorting.

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-23389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16360208#comment-16360208 ] 

Apache Spark commented on SPARK-23389:
--------------------------------------

User '10110346' has created a pull request for this issue:
https://github.com/apache/spark/pull/20576

> When the shuffle dependency specifies aggregation ,and `dependency.mapSideCombine=false`,  we should be able to use serialized sorting.
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-23389
>                 URL: https://issues.apache.org/jira/browse/SPARK-23389
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: liuxian
>            Priority: Major
>
> When the shuffle dependency specifies aggregation ,and `dependency.mapSideCombine=false`, in the map side,there is no need for aggregation and sorting, so we should be able to use serialized sorting.



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