org.apache.mahout.cf.taste.hadoop.similarity.item
Class CountUsersMapper

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,CountUsersKeyWritable,VarLongWritable>
      extended by org.apache.mahout.cf.taste.hadoop.similarity.item.CountUsersMapper

public class CountUsersMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,CountUsersKeyWritable,VarLongWritable>

Maps out the userIDs in a way that we can use a secondary sort on them


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper
org.apache.hadoop.mapreduce.Mapper.Context
 
Constructor Summary
CountUsersMapper()
           
 
Method Summary
protected  void map(org.apache.hadoop.io.LongWritable key, org.apache.hadoop.io.Text 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
 

Constructor Detail

CountUsersMapper

public CountUsersMapper()
Method Detail

map

protected void map(org.apache.hadoop.io.LongWritable key,
                   org.apache.hadoop.io.Text value,
                   org.apache.hadoop.mapreduce.Mapper.Context context)
            throws java.io.IOException,
                   java.lang.InterruptedException
Overrides:
map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,CountUsersKeyWritable,VarLongWritable>
Throws:
java.io.IOException
java.lang.InterruptedException


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