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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9492) Enable caching in MapInput for Spark
Date Mon, 02 Feb 2015 17:16:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301472#comment-14301472
] 

Jimmy Xiang commented on HIVE-9492:
-----------------------------------

V2 is uploaded to RB: https://reviews.apache.org/r/30502/

> Enable caching in MapInput for Spark
> ------------------------------------
>
>                 Key: HIVE-9492
>                 URL: https://issues.apache.org/jira/browse/HIVE-9492
>             Project: Hive
>          Issue Type: Bug
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Jimmy Xiang
>             Fix For: spark-branch
>
>         Attachments: HIVE-9492.1-spark.patch, HIVE-9492.2-spark.patch, prototype.patch
>
>
> Because of the IOContext problem (HIVE-8920, HIVE-9084), RDD caching is currently disabled
in MapInput. Prototyping shows that the problem can solved. Thus, we should formalize the
prototype and enable the caching. A good query to test this is:
> {code}
> from (select * from dec union all select * from dec2) s
> insert overwrite table dec3 select s.name, sum(s.value) group by s.name
> insert overwrite table dec4 select s.name, s.value order by s.value;
> {code}



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