org.apache.tez.mapreduce.examples

Class GroupByOrderByMRRTest.MyGroupByReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text>

org.apache.tez.mapreduce.examples.GroupByOrderByMRRTest.MyGroupByReducer

Enclosing class:

GroupByOrderByMRRTest

public static class GroupByOrderByMRRTest.MyGroupByReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text>

Intermediate reducer aggregates the total count per department. It takes department name and count as input and emits the final count per department name.

Nested Class Summary

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

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor and Description
GroupByOrderByMRRTest.MyGroupByReducer()

Method Summary

Methods

Modifier and Type	Method and Description
void	reduce(org.apache.hadoop.io.Text key, Iterable<org.apache.hadoop.io.IntWritable> values, org.apache.hadoop.mapreduce.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

GroupByOrderByMRRTest.MyGroupByReducer

public GroupByOrderByMRRTest.MyGroupByReducer()

Method Detail

reduce

public void reduce(org.apache.hadoop.io.Text key,
          Iterable<org.apache.hadoop.io.IntWritable> values,
          org.apache.hadoop.mapreduce.Reducer.Context context)
            throws IOException,
                   InterruptedException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text>

Throws:

IOException

InterruptedException