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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7526) Research to use groupby transformation to replace Hive existing partitionByKey and SparkCollector combination
Date Wed, 30 Jul 2014 20:50:40 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14079952#comment-14079952
] 

Brock Noland commented on HIVE-7526:
------------------------------------

Thank you [~csun]! May I ask you to upload patch to https://reviews.apache.org and post link
here?

> Research to use groupby transformation to replace Hive existing partitionByKey and SparkCollector
combination
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-7526
>                 URL: https://issues.apache.org/jira/browse/HIVE-7526
>             Project: Hive
>          Issue Type: Task
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Chao
>         Attachments: HIVE-7526.2.patch, HIVE-7526.3.patch, HIVE-7526.patch
>
>
> Currently SparkClient shuffles data by calling paritionByKey(). This transformation outputs
<key, value> tuples. However, Hive's ExecMapper expects <key, iterator<value>>
tuples, and Spark's groupByKey() seems outputing this directly. Thus, using groupByKey, we
may be able to avoid its own key clustering mechanism (in HiveReduceFunction). This research
is to have a try.



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