com.hazelcast.mapreduce
Interface KeyPredicate<Key>

Type Parameters:

Key - key type

All Superinterfaces:

Serializable

@Beta
public interface KeyPredicate<Key>
extends Serializable

This interface is used to pre evaluate keys before spreading the MapReduce task to the cluster. Pre-selecting keys can speed up the job since not all partitions may be used.

Since:

3.2

Method Summary

boolean

evaluate(Key key) This methods implementation contains the evaluation code whether to select a key or not.

Method Detail

evaluate

boolean evaluate(Key key)

This methods implementation contains the evaluation code whether to select a key or not.

Parameters:

key - The key to evaluate

Returns:

true if the MapReduce task should be executed on this key otherwise false