org.apache.giraph.io.formats

Class PseudoRandomIntNullVertexInputFormat

java.lang.Object

org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable<I,V,E>

org.apache.giraph.io.GiraphInputFormat<I,V,E>

org.apache.giraph.io.VertexInputFormat<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>

org.apache.giraph.io.formats.PseudoRandomIntNullVertexInputFormat

All Implemented Interfaces:

GiraphConfigurationSettable<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>, ImmutableClassesGiraphConfigurable<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>

public class PseudoRandomIntNullVertexInputFormat
extends VertexInputFormat<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>

VertexInputFormat for large scale testing, like PseudoRandomVertexInputFormat, but for the unweighted graphs where vertex ids are integers.

Constructor Summary

Constructors

Constructor and Description
PseudoRandomIntNullVertexInputFormat()

Method Summary

Modifier and Type	Method and Description
void	checkInputSpecs(org.apache.hadoop.conf.Configuration conf) Check that input is valid.
VertexReader<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>	createVertexReader(org.apache.hadoop.mapreduce.InputSplit split, org.apache.hadoop.mapreduce.TaskAttemptContext context) Create a vertex reader for a given split.
List<org.apache.hadoop.mapreduce.InputSplit>	getSplits(org.apache.hadoop.mapreduce.JobContext context, int minSplitCountHint) Get the list of input splits for the format.

Methods inherited from class org.apache.giraph.io.GiraphInputFormat

readInputSplit, writeInputSplit

Methods inherited from class org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable

getConf, setConf

Methods inherited from class java.lang.Object

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

Constructor Detail

PseudoRandomIntNullVertexInputFormat

public PseudoRandomIntNullVertexInputFormat()

Method Detail

checkInputSpecs

public void checkInputSpecs(org.apache.hadoop.conf.Configuration conf)

Description copied from class: GiraphInputFormat

Check that input is valid.

Specified by:

checkInputSpecs in class GiraphInputFormat<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>

Parameters:

conf - Configuration

getSplits

public final List<org.apache.hadoop.mapreduce.InputSplit> getSplits(org.apache.hadoop.mapreduce.JobContext context,
                                                                    int minSplitCountHint)
                                                             throws IOException,
                                                                    InterruptedException

Description copied from class: GiraphInputFormat

Get the list of input splits for the format.

Specified by:

getSplits in class GiraphInputFormat<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>

Parameters:

context - The job context

minSplitCountHint - Minimum number of splits to create (hint)

Returns:

The list of input splits

Throws:

IOException

InterruptedException

createVertexReader

public VertexReader<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable> createVertexReader(org.apache.hadoop.mapreduce.InputSplit split,
                                                                                                                                              org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                                                                                                                       throws IOException

Description copied from class: VertexInputFormat

Create a vertex reader for a given split. Guaranteed to have been configured with setConf() prior to use. The framework will also call VertexReader.initialize(InputSplit, TaskAttemptContext) before the split is used.

Specified by:

createVertexReader in class VertexInputFormat<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.FloatWritable,org.apache.hadoop.io.NullWritable>

Parameters:

split - the split to be read

context - the information about the task

Returns:

a new record reader

Throws:

IOException