org.apache.hadoop.hbase.util

Class MurmurHash3

java.lang.Object

org.apache.hadoop.hbase.util.Hash

org.apache.hadoop.hbase.util.MurmurHash3

@InterfaceAudience.Private
 @InterfaceStability.Stable
public class MurmurHash3
extends Hash

This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://code.google.com/p/smhasher/wiki/MurmurHash3 for details.

MurmurHash3 is the successor to MurmurHash2. It comes in 3 variants, and the 32-bit version targets low latency for hash table use.

Field Summary

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

INVALID_HASH, JENKINS_HASH, MURMUR_HASH, MURMUR_HASH3

Constructor Summary

Constructors

Constructor and Description
MurmurHash3()

Method Summary

Modifier and Type	Method and Description
static Hash	getInstance()
int	hash(byte[] bytes, int offset, int length, int initval) Returns the MurmurHash3_x86_32 hash.

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

getHashType, getInstance, getInstance, hash, hash, hash, parseHashType

Methods inherited from class java.lang.Object

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

Constructor Detail

MurmurHash3

public MurmurHash3()

Method Detail

getInstance

public static Hash getInstance()

hash

public int hash(byte[] bytes,
                int offset,
                int length,
                int initval)

Returns the MurmurHash3_x86_32 hash.

Specified by:

hash in class Hash

Parameters:

bytes - input bytes

offset - the offset into the array to start consideration

length - length of the valid bytes after offset to consider

initval - seed value

Returns:

hash value