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From "Jason Dere (JIRA)" <>
Subject [jira] [Commented] (HIVE-18910) Migrate to Murmur hash for shuffle and bucketing
Date Fri, 27 Apr 2018 18:19:00 GMT


Jason Dere commented on HIVE-18910:

Just add that one comment per RB review, otherwise +1 on my end pending tests.

> Migrate to Murmur hash for shuffle and bucketing
> ------------------------------------------------
>                 Key: HIVE-18910
>                 URL:
>             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-18910.31.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-18910.5.patch, HIVE-18910.6.patch, HIVE-18910.7.patch, HIVE-18910.8.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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