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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-18910) Migrate to Murmur hash for shuffle and bucketing
Date Mon, 30 Apr 2018 05:36:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-18910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HIVE-18910:
-----------------------------------------
    Fix Version/s: 3.0.0

> 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
>             Fix For: 3.0.0
>
>         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-18910.31.patch, HIVE-18910.32.patch, HIVE-18910.33.patch, HIVE-18910.34.patch, HIVE-18910.35.patch,
HIVE-18910.36.patch, HIVE-18910.36.patch, HIVE-18910.37.patch, HIVE-18910.38.patch, HIVE-18910.39.patch,
HIVE-18910.4.patch, HIVE-18910.40.patch, HIVE-18910.41.patch, HIVE-18910.42.patch, HIVE-18910.43.patch,
HIVE-18910.44.patch, HIVE-18910.45.patch, HIVE-18910.46.patch, HIVE-18910.47.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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