org.apache.giraph.io.internal

Class WrappedMappingInputFormat<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable,B extends org.apache.hadoop.io.Writable>

java.lang.Object

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

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

org.apache.giraph.io.MappingInputFormat<I,V,E,B>

org.apache.giraph.io.internal.WrappedMappingInputFormat<I,V,E,B>

Type Parameters:

I - vertexId type

V - vertexValue type

E - edgeValue type

B - mappingTarget type

All Implemented Interfaces:

GiraphConfigurationSettable<I,V,E>, ImmutableClassesGiraphConfigurable<I,V,E>

public class WrappedMappingInputFormat<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable,B extends org.apache.hadoop.io.Writable>
extends MappingInputFormat<I,V,E,B>

For internal use only. Wraps user set VertexInputFormat to make sure proper configuration parameters are passed around, that user can set parameters in configuration and they will be available in other methods related to this format.

Constructor Summary

Constructors

Constructor and Description
WrappedMappingInputFormat(MappingInputFormat<I,V,E,B> mappingInputFormat) Constructor

Method Summary

Modifier and Type	Method and Description
void	checkInputSpecs(org.apache.hadoop.conf.Configuration conf) Check that input is valid.
MappingReader<I,V,E,B>	createMappingReader(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.
org.apache.hadoop.mapreduce.InputSplit	readInputSplit(DataInput dataInput) Read input split info from DataInput.
void	writeInputSplit(org.apache.hadoop.mapreduce.InputSplit inputSplit, DataOutput dataOutput) Write input split info to DataOutput.

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

WrappedMappingInputFormat

public WrappedMappingInputFormat(MappingInputFormat<I,V,E,B> mappingInputFormat)

Constructor

Parameters:

mappingInputFormat - original mappingInputFormat

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<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Parameters:

conf - Configuration

getSplits

public 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<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Parameters:

context - The job context

minSplitCountHint - Minimum number of splits to create (hint)

Returns:

The list of input splits

Throws:

IOException

InterruptedException

createMappingReader

public MappingReader<I,V,E,B> createMappingReader(org.apache.hadoop.mapreduce.InputSplit split,
                                                  org.apache.hadoop.mapreduce.TaskAttemptContext context)
                                           throws IOException

Description copied from class: MappingInputFormat

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, org.apache.hadoop.mapreduce.TaskAttemptContext) before the split is used.

Specified by:

createMappingReader in class MappingInputFormat<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable,B extends org.apache.hadoop.io.Writable>

Parameters:

split - the split to be read

context - the information about the task

Returns:

a new record reader

Throws:

IOException

writeInputSplit

public void writeInputSplit(org.apache.hadoop.mapreduce.InputSplit inputSplit,
                            DataOutput dataOutput)
                     throws IOException

Description copied from class: GiraphInputFormat

Write input split info to DataOutput.

Overrides:

writeInputSplit in class GiraphInputFormat<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Parameters:

inputSplit - InputSplit

dataOutput - DataOutput

Throws:

IOException

readInputSplit

public org.apache.hadoop.mapreduce.InputSplit readInputSplit(DataInput dataInput)
                                                      throws IOException,
                                                             ClassNotFoundException

Description copied from class: GiraphInputFormat

Read input split info from DataInput.

Overrides:

readInputSplit in class GiraphInputFormat<I extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,E extends org.apache.hadoop.io.Writable>

Parameters:

dataInput - DataInput

Returns:

InputSplit

Throws:

IOException

ClassNotFoundException