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

Packages that use Mapper

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

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	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	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.
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.

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.