oracle.spatial.hadoop.vector.mapred

Class BufferMapper

java.lang.Object

org.apache.hadoop.mapred.MapReduceBase

oracle.spatial.hadoop.vector.mapred.BufferMapper

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.NullWritable,org.apache.hadoop.mapred.FileSplit,org.apache.hadoop.io.Text,RecordInfo>

public class BufferMapper
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.NullWritable,org.apache.hadoop.mapred.FileSplit,org.apache.hadoop.io.Text,RecordInfo>

A mapper implementation that generates a buffer for each record containing a geometry. The FileSplit given as input value represents the split to be read using an internalInputFormat. A configured RecordInfoProvider implementation is used then to get the id and geometry of each record.

The mapper's output is the record's id as key and the buffered geometry as value. The following parameters are expected in the configuration:

1. ConfigParams.BUFFER_WIDTH
2. ConfigParams.BUFFER_SMA - optional
3. ConfigParams.BUFFER_IFLAT - optional
4. ConfigParams.BUFFER_ARCT - optional

Field Summary

Fields

Modifier and Type	Field and Description
static double	MISSING_VALUE

Constructor Summary

Constructors

Constructor and Description
BufferMapper()

Method Summary

Methods

Modifier and Type	Method and Description
void	configure(org.apache.hadoop.mapred.JobConf conf)
void	map(org.apache.hadoop.io.NullWritable key, org.apache.hadoop.mapred.FileSplit value, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,RecordInfo> output, org.apache.hadoop.mapred.Reporter reporter)

Methods inherited from class org.apache.hadoop.mapred.MapReduceBase

close

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.io.Closeable

close

Field Detail

MISSING_VALUE

public static final double MISSING_VALUE

See Also:

Constant Field Values

Constructor Detail

BufferMapper

public BufferMapper()

Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf conf)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

Overrides:

configure in class org.apache.hadoop.mapred.MapReduceBase

map

public void map(org.apache.hadoop.io.NullWritable key,
                org.apache.hadoop.mapred.FileSplit value,
                org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,RecordInfo> output,
                org.apache.hadoop.mapred.Reporter reporter)
         throws java.io.IOException

Specified by:

map in interface org.apache.hadoop.mapred.Mapper<org.apache.hadoop.io.NullWritable,org.apache.hadoop.mapred.FileSplit,org.apache.hadoop.io.Text,RecordInfo>

Throws:

java.io.IOException