| Class | Description | 
|---|---|
| ChainMapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | The ChainMapper class allows to use multiple Mapper classes within a single
 Map task. | 
| ChainReducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT> | The ChainReducer class allows to chain multiple Mapper classes after a
 Reducer within the Reducer task. | 
Copyright © 2019 Apache Software Foundation. All rights reserved.