org.apache.hadoop.mapred

Class SequenceFileInputFilter<K,V>

java.lang.Object

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

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

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

All Implemented Interfaces:

InputFormat<K,V>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileInputFilter<K,V>
extends SequenceFileInputFormat<K,V>

A class that allows a map/red job to work on a sample of sequence files. The sample is decided by the filter class set by the job.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	SequenceFileInputFilter.Filter filter interface
static class	SequenceFileInputFilter.FilterBase base class for Filters
static class	SequenceFileInputFilter.MD5Filter This class returns a set of records by examing the MD5 digest of its key against a filtering frequency f.
static class	SequenceFileInputFilter.PercentFilter This class returns a percentage of records The percentage is determined by a filtering frequency f using the criteria record# % f == 0.
static class	SequenceFileInputFilter.RegexFilter Records filter by matching key to regex

Nested classes/interfaces inherited from class org.apache.hadoop.mapred.FileInputFormat

FileInputFormat.Counter

Field Summary

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

INPUT_DIR_RECURSIVE, LOG, NUM_INPUT_FILES

Constructor Summary

Constructors

Constructor and Description
SequenceFileInputFilter()

Method Summary

Methods

Modifier and Type	Method and Description
RecordReader<K,V>	getRecordReader(InputSplit split, JobConf job, Reporter reporter) Create a record reader for the given split
static void	setFilterClass(org.apache.hadoop.conf.Configuration conf, Class filterClass) set the filter class

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

listStatus

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

addInputPath, addInputPathRecursively, addInputPaths, computeSplitSize, getBlockIndex, getInputPathFilter, getInputPaths, getSplitHosts, getSplits, isSplitable, makeSplit, makeSplit, setInputPathFilter, setInputPaths, setInputPaths, setMinSplitSize

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceFileInputFilter

public SequenceFileInputFilter()

Method Detail

getRecordReader

public RecordReader<K,V> getRecordReader(InputSplit split,
                                JobConf job,
                                Reporter reporter)
                                  throws IOException

Create a record reader for the given split

Specified by:

getRecordReader in interface InputFormat<K,V>

Overrides:

getRecordReader in class SequenceFileInputFormat<K,V>

Parameters:

split - file split

job - job configuration

reporter - reporter who sends report to task tracker

Returns:

RecordReader

Throws:

IOException

setFilterClass

public static void setFilterClass(org.apache.hadoop.conf.Configuration conf,
                  Class filterClass)

set the filter class

Parameters:

conf - application configuration

filterClass - filter class