org.apache.mahout.df.mapreduce.partial
Class Step0Job.Step0Mapper

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,Step0Job.Step0Output>
      extended by org.apache.mahout.df.mapreduce.partial.Step0Job.Step0Mapper
Enclosing class:
Step0Job

protected static class Step0Job.Step0Mapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,Step0Job.Step0Output>

Outputs the first key and the size of the partition


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper
org.apache.hadoop.mapreduce.Mapper.Context
 
Constructor Summary
protected Step0Job.Step0Mapper()
           
 
Method Summary
protected  void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
           
protected  void configure(int p)
          Useful when testing
protected  void map(org.apache.hadoop.io.LongWritable key, org.apache.hadoop.io.Text value, org.apache.hadoop.mapreduce.Mapper.Context context)
           
protected  void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Mapper
run
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Step0Job.Step0Mapper

protected Step0Job.Step0Mapper()
Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
              throws java.io.IOException,
                     java.lang.InterruptedException
Overrides:
setup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,Step0Job.Step0Output>
Throws:
java.io.IOException
java.lang.InterruptedException

configure

protected void configure(int p)
Useful when testing

Parameters:
p -

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,org.apache.hadoop.io.IntWritable,Step0Job.Step0Output>
Throws:
java.io.IOException
java.lang.InterruptedException

cleanup

protected void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
                throws java.io.IOException,
                       java.lang.InterruptedException
Overrides:
cleanup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,Step0Job.Step0Output>
Throws:
java.io.IOException
java.lang.InterruptedException


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