org.apache.crunch.lib.join

Interface ShardedJoinStrategy.ShardingStrategy<K>

All Superinterfaces:

Serializable

Enclosing class:

ShardedJoinStrategy<K,U,V>

public static interface ShardedJoinStrategy.ShardingStrategy<K>
extends Serializable

Determines over how many shards a key will be split in a sharded join.

It is essential that implementations of this class are deterministic.

Method Summary

Methods

Modifier and Type	Method and Description
int	getNumShards(K key) Retrieve the number of shards over which the given key should be split.

Method Detail

getNumShards

int getNumShards(K key)

Retrieve the number of shards over which the given key should be split.

Parameters:

key - key for which shards are to be determined

Returns:

number of shards for the given key, must be greater than 0