org.terrier.structures.indexing.singlepass.hadoop

Class MultiFileCollectionInputFormat

java.lang.Object

org.apache.hadoop.mapred.FileInputFormat<K,V>

org.apache.hadoop.mapred.MultiFileInputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

org.terrier.structures.indexing.singlepass.hadoop.MultiFileCollectionInputFormat

All Implemented Interfaces:

org.apache.hadoop.mapred.InputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

public class MultiFileCollectionInputFormat
extends org.apache.hadoop.mapred.MultiFileInputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

Input Format Class for Hadoop Indexing. Splits the input collection into sets of files where each Map task gets about the same number of files. Files are assumed to be un-splittable and are not split. Splits are of adjacent files - i.e. split 0 always has the first file, and the last split always has the last file. Any given split will have adjacent files.

Since:

2.2

Author:

Richard McCreadie and Craig Macdonald

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.log4j.Logger	logger logger for this class

Fields inherited from class org.apache.hadoop.mapred.FileInputFormat

LOG

Constructor Summary

Constructors

Constructor and Description
MultiFileCollectionInputFormat()

Method Summary

Methods

Modifier and Type	Method and Description
org.apache.hadoop.mapred.RecordReader<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>	getRecordReader(org.apache.hadoop.mapred.InputSplit genericSplit, org.apache.hadoop.mapred.JobConf job, org.apache.hadoop.mapred.Reporter reporter)
org.apache.hadoop.mapred.InputSplit[]	getSplits(org.apache.hadoop.mapred.JobConf job, int numSplits)

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

addInputPath, addInputPaths, computeSplitSize, getBlockIndex, getInputPathFilter, getInputPaths, getSplitHosts, isSplitable, listStatus, setInputPathFilter, setInputPaths, setInputPaths, setMinSplitSize

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.log4j.Logger logger

logger for this class

Constructor Detail

MultiFileCollectionInputFormat

public MultiFileCollectionInputFormat()

Method Detail

getRecordReader

public org.apache.hadoop.mapred.RecordReader<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>> getRecordReader(org.apache.hadoop.mapred.InputSplit genericSplit,
                                                                                                           org.apache.hadoop.mapred.JobConf job,
                                                                                                           org.apache.hadoop.mapred.Reporter reporter)
                                                                                                             throws IOException

Specified by:

getRecordReader in interface org.apache.hadoop.mapred.InputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

Specified by:

getRecordReader in class org.apache.hadoop.mapred.MultiFileInputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

Throws:

IOException

getSplits

public org.apache.hadoop.mapred.InputSplit[] getSplits(org.apache.hadoop.mapred.JobConf job,
                                              int numSplits)
                                                throws IOException

Specified by:

getSplits in interface org.apache.hadoop.mapred.InputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

Overrides:

getSplits in class org.apache.hadoop.mapred.MultiFileInputFormat<org.apache.hadoop.io.Text,SplitAwareWrapper<Document>>

Throws:

IOException