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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21011) Upgrade MurmurHash 2.0 to 3.0 in vectorized map and reduce operators
Date Wed, 05 Dec 2018 16:25:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710287#comment-16710287
] 

ASF GitHub Bot commented on HIVE-21011:
---------------------------------------

GitHub user pudidic opened a pull request:

    https://github.com/apache/hive/pull/503

    HIVE-21011: Upgrade MurmurHash 2.0 to 3.0 in vectorized map and reduc…

    …e operators (Teddy Choi)

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/pudidic/hive HIVE-21011

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/hive/pull/503.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #503
    
----
commit 29e19e6ff9992dd0164507521fd2b9cda008a7de
Author: Teddy Choi <pudidic@...>
Date:   2018-12-05T16:22:15Z

    HIVE-21011: Upgrade MurmurHash 2.0 to 3.0 in vectorized map and reduce operators (Teddy
Choi)

----


> Upgrade MurmurHash 2.0 to 3.0 in vectorized map and reduce operators
> --------------------------------------------------------------------
>
>                 Key: HIVE-21011
>                 URL: https://issues.apache.org/jira/browse/HIVE-21011
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Teddy Choi
>            Assignee: Teddy Choi
>            Priority: Major
>              Labels: pull-request-available
>
> HIVE-20873 improved map join performance by using MurmurHash 3.0. However, there's more
operators that can use it. VectorMapJoinCommonOperator and VectorReduceSinkUniformHashOperator
use MurmurHash 2.0, so it can be upgraded to MurmurHash 3.0.



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