MurmurHash (apache-cassandra API)
Date: 2018-02-12

org.apache.cassandra.utils

## Class MurmurHash

- java.lang.Object
- - org.apache.cassandra.utils.MurmurHash

-     public class MurmurHash
      extends java.lang.Object

  This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://murmurhash.googlepages.com/ for more details. hash32() and hash64() are MurmurHash 2.0. hash3_x64_128() is *almost* MurmurHash 3.0. It was supposed to match, but we didn't catch a sign bug with the result that it doesn't. Unfortunately, we can't change it now without breaking Murmur3Partitioner. *

  The C version of MurmurHash 2.0 found at that site was ported to Java by Andrzej Bialecki (ab at getopt org).

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `MurmurHash()`

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected static long` | `fmix(long k)`
    `protected static long` | `getblock(java.nio.ByteBuffer key, int offset, int index)`
    `static long` | `hash2_64(java.nio.ByteBuffer key, int offset, int length, long seed)`
    `static void` | `hash3_x64_128(java.nio.ByteBuffer key, int offset, int length, long seed, long[] result)`
    `static int` | `hash32(java.nio.ByteBuffer data, int offset, int length, int seed)`
    `protected static long` | `rotl64(long v, int n)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### MurmurHash

          public MurmurHash()

  - ### Method Detail

    - #### hash32

          public static int hash32(java.nio.ByteBuffer data,
                                   int offset,
                                   int length,
                                   int seed)

    - #### hash2_64

          public static long hash2_64(java.nio.ByteBuffer key,
                                      int offset,
                                      int length,
                                      long seed)

    - #### getblock

          protected static long getblock(java.nio.ByteBuffer key,
                                         int offset,
                                         int index)

    - #### rotl64

          protected static long rotl64(long v,
                                       int n)

    - #### fmix

          protected static long fmix(long k)

    - #### hash3_x64_128

          public static void hash3_x64_128(java.nio.ByteBuffer key,
                                           int offset,
                                           int length,
                                           long seed,
                                           long[] result)

Copyright © 2018 The Apache Software Foundation