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