spark-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Michael Armbrust (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-2554) CountDistinct and SumDistinct should do partial aggregation
Date Fri, 19 Dec 2014 04:21:13 GMT

     [ https://issues.apache.org/jira/browse/SPARK-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Armbrust resolved SPARK-2554.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0

Issue resolved by pull request 3348
[https://github.com/apache/spark/pull/3348]

> CountDistinct and SumDistinct should do partial aggregation
> -----------------------------------------------------------
>
>                 Key: SPARK-2554
>                 URL: https://issues.apache.org/jira/browse/SPARK-2554
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.0.1, 1.0.2
>            Reporter: Cheng Lian
>            Priority: Minor
>             Fix For: 1.3.0
>
>
> {{CountDistinct}} and {{SumDistinct}} should first do a partial aggregation and return
unique value sets in each partition as partial results. Shuffle IO can be greatly reduced
in in cases that there are only a few unique values.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org


Mime
View raw message