cascading.tuple

Interface Hasher<V>

public interface Hasher<V>

The Hasher allows a Comparator implementation to also be delegated to during hashCode generation during grouping partitioning.

If a Comparator is used to compare two types during grouping, its likely the hashCode value between the two objects will not be consistent. This allows to objects being equal to hash to the same bucket (reducer) during partitioning.

As of Cascading 3.0 null values will be passed to implementations of the Hasher interface.

Method Summary

Modifier and Type	Method and Description
int	hashCode(V value) Return the hashCode of the given value.

Method Detail

hashCode

int hashCode(V value)

Return the hashCode of the given value.

Parameters:

value - may be null

Returns:

int hashCode of given value