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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18910) Migrate to Murmur hash for shuffle and bucketing
Date Fri, 13 Apr 2018 22:17:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16438006#comment-16438006
] 

Hive QA commented on HIVE-18910:
--------------------------------

| (x) *{color:red}-1 overall{color}* |
\\
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m 23s{color} | {color:red}
/data/hiveptest/logs/PreCommit-HIVE-Build-10191/patches/PreCommit-HIVE-Build-10191.patch does
not apply to master. Rebase required? Wrong Branch? See http://cwiki.apache.org/confluence/display/Hive/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| Console output | http://104.198.109.242/logs//PreCommit-HIVE-Build-10191/yetus.txt |
| Powered by | Apache Yetus    http://yetus.apache.org |


This message was automatically generated.



> Migrate to Murmur hash for shuffle and bucketing
> ------------------------------------------------
>
>                 Key: HIVE-18910
>                 URL: https://issues.apache.org/jira/browse/HIVE-18910
>             Project: Hive
>          Issue Type: Task
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>         Attachments: HIVE-18910.1.patch, HIVE-18910.10.patch, HIVE-18910.11.patch, HIVE-18910.12.patch,
HIVE-18910.13.patch, HIVE-18910.14.patch, HIVE-18910.15.patch, HIVE-18910.16.patch, HIVE-18910.17.patch,
HIVE-18910.18.patch, HIVE-18910.19.patch, HIVE-18910.2.patch, HIVE-18910.20.patch, HIVE-18910.21.patch,
HIVE-18910.22.patch, HIVE-18910.23.patch, HIVE-18910.24.patch, HIVE-18910.25.patch, HIVE-18910.26.patch,
HIVE-18910.27.patch, HIVE-18910.28.patch, HIVE-18910.29.patch, HIVE-18910.3.patch, HIVE-18910.30.patch,
HIVE-18910.4.patch, HIVE-18910.5.patch, HIVE-18910.6.patch, HIVE-18910.7.patch, HIVE-18910.8.patch,
HIVE-18910.9.patch
>
>
> Hive uses JAVA hash which is not as good as murmur for better distribution and efficiency
in bucketing a table.
> Migrate to murmur hash but still keep backward compatibility for existing users so that
they dont have to reload the existing tables.



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