com.thinkaurelius.titan.hadoop.formats.cassandra

Class TitanCassandraRecordReader

java.lang.Object

org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

com.thinkaurelius.titan.hadoop.formats.cassandra.TitanCassandraRecordReader

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

TitanCassandraWideRecordReader

public class TitanCassandraRecordReader
extends org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

Author:

Marko A. Rodriguez (http://markorodriguez.com)

Field Summary

Fields

Modifier and Type	Field and Description
protected Configuration	configuration
protected TitanCassandraHadoopGraph	graph
protected TitanCassandraInputFormat	inputFormat
protected org.apache.cassandra.hadoop.ColumnFamilyRecordReader	reader
protected FaunusVertex	vertex
protected FaunusVertexQueryFilter	vertexQuery

Constructor Summary

Constructors

Constructor and Description
TitanCassandraRecordReader(TitanCassandraInputFormat inputFormat, FaunusVertexQueryFilter vertexQuery, org.apache.cassandra.hadoop.ColumnFamilyRecordReader reader)

Method Summary

Modifier and Type	Method and Description
void	close()
org.apache.hadoop.io.NullWritable	getCurrentKey()
FaunusVertex	getCurrentValue()
float	getProgress()
void	initialize(org.apache.hadoop.mapreduce.InputSplit inputSplit, org.apache.hadoop.mapreduce.TaskAttemptContext taskAttemptContext)
boolean	nextKeyValue()

Methods inherited from class java.lang.Object

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

Field Detail

reader

protected org.apache.cassandra.hadoop.ColumnFamilyRecordReader reader

inputFormat

protected TitanCassandraInputFormat inputFormat

graph

protected TitanCassandraHadoopGraph graph

vertexQuery

protected FaunusVertexQueryFilter vertexQuery

configuration

protected Configuration configuration

vertex

protected FaunusVertex vertex

Constructor Detail

TitanCassandraRecordReader

public TitanCassandraRecordReader(TitanCassandraInputFormat inputFormat,
                                  FaunusVertexQueryFilter vertexQuery,
                                  org.apache.cassandra.hadoop.ColumnFamilyRecordReader reader)

Method Detail

initialize

public void initialize(org.apache.hadoop.mapreduce.InputSplit inputSplit,
                       org.apache.hadoop.mapreduce.TaskAttemptContext taskAttemptContext)
                throws IOException,
                       InterruptedException

Specified by:

initialize in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

Throws:

IOException

InterruptedException

nextKeyValue

public boolean nextKeyValue()
                     throws IOException,
                            InterruptedException

Specified by:

nextKeyValue in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

Throws:

IOException

InterruptedException

getCurrentKey

public org.apache.hadoop.io.NullWritable getCurrentKey()
                                                throws IOException,
                                                       InterruptedException

Specified by:

getCurrentKey in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

Throws:

IOException

InterruptedException

getCurrentValue

public FaunusVertex getCurrentValue()
                             throws IOException,
                                    InterruptedException

Specified by:

getCurrentValue in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

Throws:

IOException

InterruptedException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>

Throws:

IOException

getProgress

public float getProgress()

Specified by:

getProgress in class org.apache.hadoop.mapreduce.RecordReader<org.apache.hadoop.io.NullWritable,FaunusVertex>