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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-9240) Hybrid aggregate operator using unsafe row
Date Wed, 05 Aug 2015 07:13:04 GMT

    [ https://issues.apache.org/jira/browse/SPARK-9240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654925#comment-14654925
] 

Apache Spark commented on SPARK-9240:
-------------------------------------

User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/7954

> Hybrid aggregate operator using unsafe row
> ------------------------------------------
>
>                 Key: SPARK-9240
>                 URL: https://issues.apache.org/jira/browse/SPARK-9240
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Yin Huai
>            Assignee: Yin Huai
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
> We need a hybrid aggregate operator, which first tries hash-based aggregations and gracefully
switch to sort-based aggregations if the hash map's memory footprint exceeds a given threshold
(how to track memory footprint and how to set the threshold?).



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