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https://issues.apache.org/jira/browse/HIVE-6924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13974440#comment-13974440
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Gopal V commented on HIVE-6924:
-------------------------------

I tracked down the version of MurmurHash checked into hadoop itself

http://hadoop.apache.org/docs/r1.1.2/api/org/apache/hadoop/util/hash/MurmurHash.html

With this inlined into the MapJoinKeyBytes, I get 

before: http://people.apache.org/~gopalv/mapjoin-flame.svg
after: http://people.apache.org/~gopalv/mapjoin-murumur-flame.svg


> 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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