de.hpi.fgis.voidgen.hadoop.util
Class TextCountReducer
java.lang.Object
org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>
de.hpi.fgis.voidgen.hadoop.util.TextCountReducer
public class TextCountReducer
- extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>
Aggregates pairs of Text and IntWritable by
the Text key and sums up the values.
Input
- Key: a textual representation
- Value: integer value
Output
- Key: textual representation
- Value: sum of all integer values with the same key
- Author:
- Johannes Gosda, Hasso Plattner Institute at University of Potsdam, Germany
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer |
org.apache.hadoop.mapreduce.Reducer.Context |
Method Summary |
void |
reduce(org.apache.hadoop.io.Text key,
java.lang.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 |
TextCountReducer
public TextCountReducer()
reduce
public void reduce(org.apache.hadoop.io.Text key,
java.lang.Iterable<org.apache.hadoop.io.IntWritable> values,
org.apache.hadoop.mapreduce.Reducer.Context context)
throws java.io.IOException,
java.lang.InterruptedException
- Overrides:
reduce
in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable>
- Throws:
java.io.IOException
java.lang.InterruptedException