org.apache.mahout.math.stats.entropy
Class KeyCounterMapper
java.lang.Object
org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,Object,org.apache.hadoop.io.Writable,VarIntWritable>
org.apache.mahout.math.stats.entropy.KeyCounterMapper
public final class KeyCounterMapper
- extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,Object,org.apache.hadoop.io.Writable,VarIntWritable>
Emits the key and the count of 1 as VarIntWritable
.
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper |
org.apache.hadoop.mapreduce.Mapper.Context |
Method Summary |
protected void |
map(org.apache.hadoop.io.Writable key,
Object value,
org.apache.hadoop.mapreduce.Mapper.Context context)
|
Methods inherited from class org.apache.hadoop.mapreduce.Mapper |
cleanup, run, setup |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
KeyCounterMapper
public KeyCounterMapper()
map
protected void map(org.apache.hadoop.io.Writable key,
Object value,
org.apache.hadoop.mapreduce.Mapper.Context context)
throws IOException,
InterruptedException
- Overrides:
map
in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,Object,org.apache.hadoop.io.Writable,VarIntWritable>
- Throws:
IOException
InterruptedException
Copyright © 2008-2012 The Apache Software Foundation. All Rights Reserved.