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

Packages that use Mapper

Package	Description
org.apache.hadoop.mapred
org.apache.hadoop.mapred.lib
org.apache.hadoop.mapred.lib.aggregate

Uses of Mapper in org.apache.hadoop.mapred

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

Modifier and Type	Method and Description
protected Mapper<K1,V1,K2,V2>	MapRunner.getMapper()

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

Modifier and Type	Method and Description
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

Modifier and Type	Method and Description
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

Modifier and Type	Class and Description
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 <token,freq> pairs.

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

Modifier and Type	Method and Description
static void	MultipleInputs.addInputPath(JobConf conf, org.apache.hadoop.fs.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

Modifier and Type	Class and Description
class	ValueAggregatorCombiner<K1 extends org.apache.hadoop.io.WritableComparable,V1 extends org.apache.hadoop.io.Writable> This class implements the generic combiner of Aggregate.
class	ValueAggregatorJobBase<K1 extends org.apache.hadoop.io.WritableComparable,V1 extends org.apache.hadoop.io.Writable> This abstract class implements some common functionalities of the the generic mapper, reducer and combiner classes of Aggregate.
class	ValueAggregatorMapper<K1 extends org.apache.hadoop.io.WritableComparable,V1 extends org.apache.hadoop.io.Writable> This class implements the generic mapper of Aggregate.
class	ValueAggregatorReducer<K1 extends org.apache.hadoop.io.WritableComparable,V1 extends org.apache.hadoop.io.Writable> This class implements the generic reducer of Aggregate.