hive-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Xuefu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-8639) Convert SMBJoin to MapJoin [Spark Branch]
Date Fri, 29 May 2015 02:29:38 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xuefu Zhang updated HIVE-8639:
------------------------------
    Fix Version/s:     (was: spark-branch)
                   1.1.0

> Convert SMBJoin to MapJoin [Spark Branch]
> -----------------------------------------
>
>                 Key: HIVE-8639
>                 URL: https://issues.apache.org/jira/browse/HIVE-8639
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>    Affects Versions: spark-branch
>            Reporter: Szehon Ho
>            Assignee: Szehon Ho
>             Fix For: 1.1.0
>
>         Attachments: HIVE-8639.1-spark.patch, HIVE-8639.2-spark.patch, HIVE-8639.3-spark.patch,
HIVE-8639.3-spark.patch, HIVE-8639.4-spark.patch
>
>
> HIVE-8202 supports auto-conversion of SMB Join.  However, if the tables are partitioned,
there could be a slow down as each mapper would need to get a very small chunk of a partition
which has a single key. Thus, in some scenarios it's beneficial to convert SMB join to map
join.
> The task is to research and support the conversion from SMB join to map join for Spark
execution engine.  See the equivalent of MapReduce in SortMergeJoinResolver.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message