org.apache.crunch.util

Class HashUtil

java.lang.Object

org.apache.crunch.util.HashUtil

public class HashUtil
extends Object

Utility methods for working with hash codes.

Constructor Summary

Constructors

Constructor and Description
HashUtil()

Method Summary

Modifier and Type	Method and Description
static int	smearHash(int hashCode) Applies a supplemental hashing function to an integer, increasing variability in lower-order bits.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashUtil

public HashUtil()

Method Detail

smearHash

public static int smearHash(int hashCode)

Applies a supplemental hashing function to an integer, increasing variability in lower-order bits. This method is intended to avoid collisions in functions which rely on variance in the lower bits of a hash code (e.g. hash partitioning).