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Posted to dev@hive.apache.org by "Jimmy Xiang (JIRA)" <ji...@apache.org> on 2014/11/15 01:33:34 UTC

[jira] [Commented] (HIVE-8844) Choose a persisent policy for RDD caching [Spark Branch]

    [ https://issues.apache.org/jira/browse/HIVE-8844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14213161#comment-14213161 ] 

Jimmy Xiang commented on HIVE-8844:
-----------------------------------

Patch is on RB: https://reviews.apache.org/r/28064/

> Choose a persisent policy for RDD caching [Spark Branch]
> --------------------------------------------------------
>
>                 Key: HIVE-8844
>                 URL: https://issues.apache.org/jira/browse/HIVE-8844
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Jimmy Xiang
>             Fix For: spark-branch
>
>         Attachments: HIVE-8844.1-spark.patch
>
>
> RDD caching is used for performance reasons in some multi-insert queries. Currently, we call RDD.cache(), which indicates a persistency policy of using memory only. We should choose a better policy. I think memory+disk will be good enough. Refer to RDD.persist() for more information.



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