org.apache.tez.mapreduce.examples

Class GroupByOrderByMRRTest.MyOrderByNoOpReducer

java.lang.Object

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

org.apache.tez.mapreduce.examples.GroupByOrderByMRRTest.MyOrderByNoOpReducer

Enclosing class:

GroupByOrderByMRRTest

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

Shuffle ensures ordering based on count of employees per department hence the final reducer is a no-op and just emits the department name with the employee count per department.

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.MyOrderByNoOpReducer()

Method Summary

Methods

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

public GroupByOrderByMRRTest.MyOrderByNoOpReducer()

Method Detail

reduce

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

Overrides:

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

Throws:

IOException

InterruptedException