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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2015/10/30 21:22:27 UTC

[jira] [Updated] (SPARK-11425) Improve hybrid aggregation (sort-based after hash-based)

     [ https://issues.apache.org/jira/browse/SPARK-11425?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated SPARK-11425:
------------------------------
    Component/s: Spark Core

> Improve hybrid aggregation (sort-based after hash-based)
> --------------------------------------------------------
>
>                 Key: SPARK-11425
>                 URL: https://issues.apache.org/jira/browse/SPARK-11425
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>            Reporter: Davies Liu
>
> After aggregation, the dataset could be smaller than inputs, so it's better to do hash based aggregation for all inputs, then using sort based aggregation to merge them.



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