Uses of Interface
org.apache.hadoop.mapred.Mapper

Packages that use Mapper

org.apache.hadoop.contrib.index.example
org.apache.hadoop.contrib.index.mapred
org.apache.hadoop.contrib.utils.join
org.apache.hadoop.examples	Hadoop example code.
org.apache.hadoop.examples.dancing	This package is a distributed implementation of Knuth's dancing links algorithm that can run under Hadoop.
org.apache.hadoop.examples.terasort	This package consists of 3 map/reduce applications for Hadoop to compete in the annual terabyte sort competition.
org.apache.hadoop.mapred	A software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) parallelly on large clusters (thousands of nodes) built of commodity hardware in a reliable, fault-tolerant manner.
org.apache.hadoop.mapred.lib	Library of generally useful mappers, reducers, and partitioners.
org.apache.hadoop.mapred.lib.aggregate	Classes for performing various counting and aggregations.
org.apache.hadoop.streaming	Hadoop Streaming is a utility which allows users to create and run Map-Reduce jobs with any executables (e.g.

Uses of Mapper in org.apache.hadoop.contrib.index.example

Classes in org.apache.hadoop.contrib.index.example that implement Mapper

class	IdentityLocalAnalysis Identity local analysis maps inputs directly into outputs.
class	LineDocLocalAnalysis Convert LineDocTextAndOp to DocumentAndOp as required by ILocalAnalysis.

Uses of Mapper in org.apache.hadoop.contrib.index.mapred

Subinterfaces of Mapper in org.apache.hadoop.contrib.index.mapred

interface

ILocalAnalysis<K extends WritableComparable,V extends Writable> Application specific local analysis.

Classes in org.apache.hadoop.contrib.index.mapred that implement Mapper

class

IndexUpdateMapper<K extends WritableComparable,V extends Writable> This class applies local analysis on a key-value pair and then convert the result docid-operation pair to a shard-and-intermediate form pair.

Uses of Mapper in org.apache.hadoop.contrib.utils.join

Classes in org.apache.hadoop.contrib.utils.join that implement Mapper

class	DataJoinMapperBase This abstract class serves as the base class for the mapper class of a data join job.
class	DataJoinReducerBase This abstract class serves as the base class for the reducer class of a data join job.
class	JobBase A common base implementing some statics collecting mechanisms that are commonly used in a typical map/reduce job.

Uses of Mapper in org.apache.hadoop.examples

Classes in org.apache.hadoop.examples that implement Mapper

static class	MultiFileWordCount.MapClass This Mapper is similar to the one in MultiFileWordCount.MapClass.
static class	PiEstimator.PiMapper Mapper class for Pi estimation.
class	SleepJob Dummy class for testing MR framefork.

Uses of Mapper in org.apache.hadoop.examples.dancing

Classes in org.apache.hadoop.examples.dancing that implement Mapper

static class

DistributedPentomino.PentMap Each map takes a line, which represents a prefix move and finds all of the solutions that start with that prefix.

Uses of Mapper in org.apache.hadoop.examples.terasort

Classes in org.apache.hadoop.examples.terasort that implement Mapper

static class

TeraGen.SortGenMapper The Mapper class that given a row number, will generate the appropriate output line.

Uses of Mapper in org.apache.hadoop.mapred

Methods in org.apache.hadoop.mapred that return Mapper

protected Mapper<K1,V1,K2,V2>

MapRunner.getMapper()

Methods in org.apache.hadoop.mapred that return types with arguments of type Mapper

Class<? extends Mapper>

JobConf.getMapperClass() Get the Mapper class for the job.

Method parameters in org.apache.hadoop.mapred with type arguments of type Mapper

void	JobConf.setMapperClass(Class<? extends Mapper> theClass) Set the Mapper class for the job.

Uses of Mapper in org.apache.hadoop.mapred.lib

Classes in org.apache.hadoop.mapred.lib that implement Mapper

class	ChainMapper The ChainMapper class allows to use multiple Mapper classes within a single Map task.
class	DelegatingMapper<K1,V1,K2,V2> An Mapper that delegates behaviour of paths to multiple other mappers.
class	FieldSelectionMapReduce<K,V> This class implements a mapper/reducer class that can be used to perform field selections in a manner similar to unix cut.
class	IdentityMapper<K,V> Implements the identity function, mapping inputs directly to outputs.
class	InverseMapper<K,V> A Mapper that swaps keys and values.
class	RegexMapper<K> A Mapper that extracts text matching a regular expression.
class	TokenCountMapper<K> A Mapper that maps text values into pairs.

Method parameters in org.apache.hadoop.mapred.lib with type arguments of type Mapper

static void	MultipleInputs.addInputPath(JobConf conf, Path path, Class<? extends InputFormat> inputFormatClass, Class<? extends Mapper> mapperClass) Add a Path with a custom InputFormat and Mapper to the list of inputs for the map-reduce job.
static <K1,V1,K2,V2> void	ChainReducer.addMapper(JobConf job, Class<? extends Mapper<K1,V1,K2,V2>> klass, Class<? extends K1> inputKeyClass, Class<? extends V1> inputValueClass, Class<? extends K2> outputKeyClass, Class<? extends V2> outputValueClass, boolean byValue, JobConf mapperConf) Adds a Mapper class to the chain job's JobConf.
static <K1,V1,K2,V2> void	ChainMapper.addMapper(JobConf job, Class<? extends Mapper<K1,V1,K2,V2>> klass, Class<? extends K1> inputKeyClass, Class<? extends V1> inputValueClass, Class<? extends K2> outputKeyClass, Class<? extends V2> outputValueClass, boolean byValue, JobConf mapperConf) Adds a Mapper class to the chain job's JobConf.

Uses of Mapper in org.apache.hadoop.mapred.lib.aggregate

Classes in org.apache.hadoop.mapred.lib.aggregate that implement Mapper

class	ValueAggregatorCombiner<K1 extends WritableComparable,V1 extends Writable> This class implements the generic combiner of Aggregate.
class	ValueAggregatorJobBase<K1 extends WritableComparable,V1 extends Writable> This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
class	ValueAggregatorMapper<K1 extends WritableComparable,V1 extends Writable> This class implements the generic mapper of Aggregate.
class	ValueAggregatorReducer<K1 extends WritableComparable,V1 extends Writable> This class implements the generic reducer of Aggregate.

Uses of Mapper in org.apache.hadoop.streaming

Classes in org.apache.hadoop.streaming that implement Mapper

class

PipeMapper A generic Mapper bridge.