de.hpi.fgis.voidgen.hadoop.tasks.clustering2
Class ClosureStep1RDFInputMapper

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Mapper<KEYIN,VALUEIN,Step1Pair,ClusterId>
      extended by de.hpi.fgis.voidgen.hadoop.closure.Step1MapperBase<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>
          extended by de.hpi.fgis.voidgen.hadoop.tasks.clustering2.ClosureStep1RDFInputMapper

public class ClosureStep1RDFInputMapper
extends Step1MapperBase<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text>

The Mapper for the first step of the transitive closure generation. This Mapper uses input files that contain one RDF quadruple per input line.

Notice: if an input tuple will not be accepted by the filter, the nodes within that tuple will also not appear as clusters after transitive closure generation.

Input

Output see Step1MapperBase

Author:
Dandy Fenz, Hasso Plattner Institute at University of Potsdam, Germany, Matthias Pohl, Hasso Plattner Institute at University of Potsdam, Germany, Johannes Gosda, Hasso Plattner Institute at University of Potsdam, Germany

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper
org.apache.hadoop.mapreduce.Mapper.Context
 
Constructor Summary
ClosureStep1RDFInputMapper()
           
 
Method Summary
 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 de.hpi.fgis.voidgen.hadoop.closure.Step1MapperBase
newClusterId
 
Methods inherited from class org.apache.hadoop.mapreduce.Mapper
cleanup, run
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ClosureStep1RDFInputMapper

public ClosureStep1RDFInputMapper()
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,Step1Pair,ClusterId>
Throws:
java.io.IOException
java.lang.InterruptedException

map

public 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,Step1Pair,ClusterId>
Throws:
java.io.IOException
java.lang.InterruptedException