co.cask.cdap.etl.batch.mapreduce

Class ETLMapReduce.ETLReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer

co.cask.cdap.etl.batch.mapreduce.ETLMapReduce.ETLReducer

All Implemented Interfaces:

ProgramLifecycle<MapReduceTaskContext<Object,Object>>

Enclosing class:

ETLMapReduce

public static class ETLMapReduce.ETLReducer
extends Reducer
implements ProgramLifecycle<MapReduceTaskContext<Object,Object>>

Reducer for a phase of an ETL pipeline.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

Reducer.Context

Constructor Summary

Constructors

Constructor and Description
ETLMapReduce.ETLReducer()

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy()
void	initialize(MapReduceTaskContext<Object,Object> context)
protected void	reduce(Object key, Iterable values, Reducer.Context context)

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

cleanup, run, setup

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ETLMapReduce.ETLReducer

public ETLMapReduce.ETLReducer()

Method Detail

initialize

public void initialize(MapReduceTaskContext<Object,Object> context)
                throws Exception

Specified by:

initialize in interface ProgramLifecycle<MapReduceTaskContext<Object,Object>>

Throws:

Exception

reduce

protected void reduce(Object key,
          Iterable values,
          Reducer.Context context)
               throws IOException,
                      InterruptedException

Overrides:

reduce in class Reducer

Throws:

IOException

InterruptedException

destroy

public void destroy()

Specified by:

destroy in interface ProgramLifecycle<MapReduceTaskContext<Object,Object>>