oracle.spatial.hadoop.vector.mapred.job

Class Partitioning

java.lang.Object

org.apache.hadoop.conf.Configured

oracle.spatial.hadoop.vector.mapred.job.BaseJob<java.lang.Object,java.lang.Object>

oracle.spatial.hadoop.vector.mapred.job.MultipleInputsJob

oracle.spatial.hadoop.vector.mapred.job.Partitioning

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

Direct Known Subclasses:

Partitioning

public class Partitioning
extends MultipleInputsJob

This class can be used to run or configure a job for spatially partitioning one or more data sets.
Partitioning can be performed using only a fraction of the input data size by setting the setSamplingRatio(double) property (by default it is set to 0.1).
The job's output is a partitioning file, a GeoJSON file containing the generated partitions with information such as the partition geometry and number of elements in the partition.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	PARTITION_RESULT_FILE
protected double	samplingRatio

Fields inherited from class oracle.spatial.hadoop.vector.mapred.job.MultipleInputsJob

inputDataSets, miConf

Fields inherited from class oracle.spatial.hadoop.vector.mapred.job.BaseJob

argsp, jarClass

Constructor Summary

Constructors

Constructor and Description
Partitioning()

Method Summary

Modifier and Type	Method and Description
void	configure(org.apache.hadoop.mapred.JobConf job) Validates and adds the current parameters to the job configuration
protected void	defineGlobaBounds() Defines the dimension boundaries for the partitioning space based on the SpatialOperationConfig and the SpatialConfig defined for each input data set.
java.lang.String	getCmdOptions() Gets a description of the arguments expected from command line.
protected long	getPathsLength(org.apache.hadoop.fs.Path[] paths, org.apache.hadoop.conf.Configuration conf)
protected org.apache.hadoop.fs.Path	getSamplePath(org.apache.hadoop.fs.Path sampleDir, org.apache.hadoop.conf.Configuration conf)
double	getSamplingRatio() Gets the ratio of the sample size to the input data size
static void	main(java.lang.String[] args)
void	processArgs(java.lang.String[] args, org.apache.hadoop.conf.Configuration conf) Extracts and validates arguments from the command line
int	run(java.lang.String[] args)
boolean	runFullPartitioningProcess(org.apache.hadoop.mapred.JobConf job) Runs the full partitioning process.
void	setSamplingRatio(double samplingRatio) Sets the ratio of the sample size to the input data size so only a fraction of the whole input data is used for partitioning.

Methods inherited from class oracle.spatial.hadoop.vector.mapred.job.MultipleInputsJob

addInputDataSet, configure, configureInputs, configureInputs, getInputListCmdOptions, getInputs, getMultipleInputDataSetsParams, removeInputDataSet, setInputDataSets

Methods inherited from class oracle.spatial.hadoop.vector.mapred.job.BaseJob

createJob, createJob, createJob, createJob, createJobConf, createJobConf, createJobConf, getInput, getInputFormatClass, getJarClass, getOutput, getRecordInfoProviderClass, getSpatialConfig, setInput, setInputFormatClass, setJarClass, setOutput, setRecordInfoProviderClass, setSpatialConfig

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Field Detail

PARTITION_RESULT_FILE

public static final java.lang.String PARTITION_RESULT_FILE

See Also:

Constant Field Values

samplingRatio

protected double samplingRatio

Constructor Detail

Partitioning

public Partitioning()

Method Detail

setSamplingRatio

public void setSamplingRatio(double samplingRatio)

Sets the ratio of the sample size to the input data size so only a fraction of the whole input data is used for partitioning.

Parameters:

samplingRatio -

getSamplingRatio

public double getSamplingRatio()

Gets the ratio of the sample size to the input data size

Returns:

processArgs

public void processArgs(java.lang.String[] args,
                        org.apache.hadoop.conf.Configuration conf)
                 throws java.lang.Exception

Description copied from class: BaseJob

Extracts and validates arguments from the command line

Overrides:

processArgs in class MultipleInputsJob

Parameters:

args - arguments from the command line

conf - the job configuration

Throws:

java.lang.Exception

getCmdOptions

public java.lang.String getCmdOptions()

Description copied from class: BaseJob

Gets a description of the arguments expected from command line.

Overrides:

getCmdOptions in class MultipleInputsJob

Returns:

a text description

configure

public void configure(org.apache.hadoop.mapred.JobConf job)
               throws java.lang.Exception

Description copied from class: BaseJob

Validates and adds the current parameters to the job configuration

Overrides:

configure in class MultipleInputsJob

Parameters:

job - the job configuration

Throws:

java.lang.Exception

runFullPartitioningProcess

public boolean runFullPartitioningProcess(org.apache.hadoop.mapred.JobConf job)
                                   throws java.lang.Exception

Runs the full partitioning process. It is not needed to call configure() when calling this method

Parameters:

job -

Returns:

true if the job finished successfully

Throws:

java.lang.Exception

defineGlobaBounds

protected void defineGlobaBounds()

Defines the dimension boundaries for the partitioning space based on the SpatialOperationConfig and the SpatialConfig defined for each input data set.

run

public int run(java.lang.String[] args)
        throws java.lang.Exception

Throws:

java.lang.Exception

getPathsLength

protected long getPathsLength(org.apache.hadoop.fs.Path[] paths,
                              org.apache.hadoop.conf.Configuration conf)
                       throws java.io.IOException

Throws:

java.io.IOException

getSamplePath

protected org.apache.hadoop.fs.Path getSamplePath(org.apache.hadoop.fs.Path sampleDir,
                                                  org.apache.hadoop.conf.Configuration conf)
                                           throws java.io.IOException

Throws:

java.io.IOException

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception

Throws:

java.lang.Exception