org.apache.hadoop.hbase.util

Class MurmurHash

java.lang.Object

org.apache.hadoop.hbase.util.Hash

org.apache.hadoop.hbase.util.MurmurHash

@InterfaceAudience.Private
 @InterfaceStability.Stable
public class MurmurHash
extends Hash

This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://murmurhash.googlepages.com/ for more details.

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

Field Summary

Fields

Modifier and Type	Field and Description
private static MurmurHash	_instance

Fields inherited from class org.apache.hadoop.hbase.util.Hash

INVALID_HASH, JENKINS_HASH, MURMUR_HASH, MURMUR_HASH3

Constructor Summary

Constructors

Constructor and Description
MurmurHash()

Method Summary

Modifier and Type	Method and Description
static Hash	getInstance()
<T> int	hash(HashKey<T> hashKey, int seed) Calculate a hash using bytes from HashKey and the provided seed value.

Methods inherited from class org.apache.hadoop.hbase.util.Hash

getHashType, getInstance, getInstance, parseHashType

Methods inherited from class java.lang.Object

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

Field Detail

_instance

private static MurmurHash _instance

Constructor Detail

MurmurHash

public MurmurHash()

Method Detail

getInstance

public static Hash getInstance()

hash

public <T> int hash(HashKey<T> hashKey,
                    int seed)

Description copied from class: Hash

Calculate a hash using bytes from HashKey and the provided seed value.

Specified by:

hash in class Hash

Parameters:

hashKey - key to extract the hash

seed - the seed value

Returns:

hash value