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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6924) MapJoinKeyBytes::hashCode() should use Murmur hash
Date Fri, 18 Apr 2014 22:44:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974588#comment-13974588
] 

Gopal V commented on HIVE-6924:
-------------------------------

old vs Apache murmur (as a static method inside MapJoinKeyBytes).

The hash does cut down on fraction of equals() calls.

> MapJoinKeyBytes::hashCode() should use Murmur hash
> --------------------------------------------------
>
>                 Key: HIVE-6924
>                 URL: https://issues.apache.org/jira/browse/HIVE-6924
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-6924.patch
>
>
> Existing hashCode is bad, causes HashMap to cluster



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