oracle.spatial.hadoop.vector.mapreduce

Class MVSHierachicalCountMapper<K,V>

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,org.apache.hadoop.mapreduce.lib.input.FileSplit,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

oracle.spatial.hadoop.vector.mapreduce.MVSHierachicalCountMapper<K,V>

Type Parameters:

K - The type of the internalInputFormat's keys

V - The type of the internalInputFormat's values

public class MVSHierachicalCountMapper<K,V>
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,org.apache.hadoop.mapreduce.lib.input.FileSplit,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

This mapper implementation catalogs records in different hierarchy levels using MVSuggest.

The output key is a combination of the hierarchy layer's name and the hierarchy level's feature id. The value is the number of records counted for the key's feature

Expected configuration:

• ConfigParams.INTERNAL_INPUT_FORMAT
• ConfigParams.RECORD_INFO_PROVIDER
• ConfigParams.HIERARCHY_INFO_CLASS
• MVSConfig.CONF_SERVCE_LOCATION

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor and Description
MVSHierachicalCountMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	map(org.apache.hadoop.io.NullWritable key, org.apache.hadoop.mapreduce.lib.input.FileSplit value, org.apache.hadoop.mapreduce.Mapper.Context context)
void	setup(org.apache.hadoop.mapreduce.Mapper.Context context)

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

MVSHierachicalCountMapper

public MVSHierachicalCountMapper()

Method Detail

setup

public 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.NullWritable,org.apache.hadoop.mapreduce.lib.input.FileSplit,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

Throws:

java.io.IOException

java.lang.InterruptedException

map

public void map(org.apache.hadoop.io.NullWritable key,
                org.apache.hadoop.mapreduce.lib.input.FileSplit 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.NullWritable,org.apache.hadoop.mapreduce.lib.input.FileSplit,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

Throws:

java.io.IOException

java.lang.InterruptedException