[jira] [Resolved] (FLINK-3623) Adjust MurmurHash algorithm

["Stephan Ewen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3623?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen resolved FLINK-3623.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 1.1.0

Fixed via 641a0d436c9b7a34ff33ceb370cf29962cac4dee


> Adjust MurmurHash algorithm
> ---------------------------
>
>                 Key: FLINK-3623
>                 URL: https://issues.apache.org/jira/browse/FLINK-3623
>             Project: Flink
>          Issue Type: Improvement
>          Components: Distributed Runtime
>    Affects Versions: 1.1.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>            Priority: Trivial
>             Fix For: 1.1.0
>
>
> Flink's MurmurHash implementation differs from the published algorithm.
> From Flink's MathUtils.java:
> {code}
> code *= 0xe6546b64;
> {code}
> The Murmur3_32 algorithm as described by [Wikipedia|https://en.wikipedia.org/wiki/MurmurHash]:
> {code}
> m ← 5
> n ← 0xe6546b64
> hash ← hash × m + n
> {code}
> and in Guava's Murmur3_32HashFunction.java:
> {code}
> h1 = h1 * 5 + 0xe6546b64;
> {code}



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