com.hazelcast.mapreduce

Interface ReducerFactory<KeyIn,ValueIn,ValueOut>

Type Parameters:

KeyIn - key type of the resulting keys

ValueIn - value type of the incoming values

ValueOut - value type of the reduced values

All Superinterfaces:

Serializable

Deprecated.

MapReduce is deprecated and will be removed in 4.0. For map aggregations, you can use Aggregator on IMap. For general data processing, it is superseded by Hazelcast Jet.

@Deprecated
public interface ReducerFactory<KeyIn,ValueIn,ValueOut>
extends Serializable

A ReducerFactory implementation is used to build Reducer instances per key.
An implementation needs to be serializable by Hazelcast since it might be distributed inside the cluster to do parallel calculations for reducing.

Since:

3.2

Method Summary

Modifier and Type	Method and Description
Reducer<ValueIn,ValueOut>	newReducer(KeyIn key) Deprecated. Build a new Reducer instance specific to the supplied key.

Method Detail

newReducer

Reducer<ValueIn,ValueOut> newReducer(KeyIn key)

Deprecated.

Build a new Reducer instance specific to the supplied key.

Parameters:

key - key the Reducer is built for

Returns:

a Reducer instance specific for the given key