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From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8640) Support hints of SMBJoin [Spark Branch]
Date Mon, 22 Dec 2014 19:16:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14256063#comment-14256063
] 

Xuefu Zhang commented on HIVE-8640:
-----------------------------------

Agreed. I guess it doesn't hurt to have some doc about supported join optimization in Spark
specific general sessions. I also such marked for other optimizations. Yes, no new configurations.

> Support hints of SMBJoin [Spark Branch]
> ---------------------------------------
>
>                 Key: HIVE-8640
>                 URL: https://issues.apache.org/jira/browse/HIVE-8640
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Szehon Ho
>            Assignee: Szehon Ho
>              Labels: TODOC-SPARK
>             Fix For: spark-branch
>
>         Attachments: HIVE-8640.1-spark.patch, HIVE-8640.2-spark.patch, HIVE-8640.3-spark.patch
>
>
> HIVE-8202 supports conversion of join to SMB Join automatically, which relies on the
configuration property: "hive.auto.convert.sortmerge.join.bigtable.selection.policy".  
> This task is to support conversion based on map-hints, instead of this policy.  As hints
are deprecated, this would not be the primary policy in line with MapReduce, but can be available
as a backup to achieve feature parity.



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