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Posted to issues@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2018/05/02 18:07:00 UTC

[jira] [Updated] (HIVE-18910) Migrate to Murmur hash for shuffle and bucketing

     [ 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:     (was: 3.0.0)
                   3.1.0

> 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
>    Affects Versions: 3.0.0, 3.1.0
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>            Priority: Major
>             Fix For: 3.1.0
>
>         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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