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From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8017) Use HiveKey instead of BytesWritable as key type of the pair RDD [Spark Branch]
Date Mon, 08 Sep 2014 06:44:28 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14125252#comment-14125252
] 

Rui Li commented on HIVE-8017:
------------------------------

This patch change the RDD key type to HiveKey after map/reduce functions have been applied.
Original input RDD key type remains BytesWritable.

> Use HiveKey instead of BytesWritable as key type of the pair RDD [Spark Branch]
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-8017
>                 URL: https://issues.apache.org/jira/browse/HIVE-8017
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Rui Li
>            Assignee: Rui Li
>         Attachments: HIVE-8017-spark.patch
>
>
> HiveKey should be used as the key type because it holds the hash code for partitioning.
While BytesWritable serves partitioning well for simple cases, we have to use {{HiveKey.hashCode}}
for more complicated ones, e.g. join, bucketed table, etc.



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