Uses of Class
org.apache.hadoop.mapreduce.Mapper

Packages that use Mapper
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.pi This package consists of a map/reduce application, distbbp, which computes exact binary digits of the mathematical constant π. 
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.mapreduce   
org.apache.hadoop.mapreduce.lib.aggregate Classes for performing various counting and aggregations. 
org.apache.hadoop.mapreduce.lib.chain   
org.apache.hadoop.mapreduce.lib.fieldsel   
org.apache.hadoop.mapreduce.lib.input   
org.apache.hadoop.mapreduce.lib.map   
org.apache.hadoop.mapreduce.lib.reduce   
 

Uses of Mapper in org.apache.hadoop.examples
 

Subclasses of Mapper in org.apache.hadoop.examples
static class BaileyBorweinPlouffe.BbpMapper
          Mapper class computing digits of Pi.
static class MultiFileWordCount.MapClass
          This Mapper is similar to the one in MultiFileWordCount.MapClass.
static class QuasiMonteCarlo.QmcMapper
          Mapper class for Pi estimation.
static class SecondarySort.MapClass
          Read two integers from each line and generate a key, value pair as ((left, right), right).
static class WordCount.TokenizerMapper
           
 

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

Subclasses of Mapper in org.apache.hadoop.examples.dancing
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.pi
 

Subclasses of Mapper in org.apache.hadoop.examples.pi
static class DistSum.MapSide.SummingMapper
          A mapper which computes sums
static class DistSum.ReduceSide.PartitionMapper
          A Mapper which partitions a summation
 

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

Subclasses of Mapper in org.apache.hadoop.examples.terasort
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.mapreduce
 

Methods in org.apache.hadoop.mapreduce that return types with arguments of type Mapper
 Class<? extends Mapper<?,?,?,?>> JobContext.getMapperClass()
          Get the Mapper class for the job.
 

Method parameters in org.apache.hadoop.mapreduce with type arguments of type Mapper
 void Job.setMapperClass(Class<? extends Mapper> cls)
          Set the Mapper for the job.
 

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

Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.aggregate
 class ValueAggregatorMapper<K1 extends WritableComparable<?>,V1 extends Writable>
          This class implements the generic mapper of Aggregate.
 

Uses of Mapper in org.apache.hadoop.mapreduce.lib.chain
 

Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.chain
 class ChainMapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
          The ChainMapper class allows to use multiple Mapper classes within a single Map task.
 

Method parameters in org.apache.hadoop.mapreduce.lib.chain with type arguments of type Mapper
static void ChainReducer.addMapper(Job job, Class<? extends Mapper> klass, Class<?> inputKeyClass, Class<?> inputValueClass, Class<?> outputKeyClass, Class<?> outputValueClass, org.apache.hadoop.conf.Configuration mapperConf)
          Adds a Mapper class to the chain reducer.
static void ChainMapper.addMapper(Job job, Class<? extends Mapper> klass, Class<?> inputKeyClass, Class<?> inputValueClass, Class<?> outputKeyClass, Class<?> outputValueClass, org.apache.hadoop.conf.Configuration mapperConf)
          Adds a Mapper class to the chain mapper.
 

Uses of Mapper in org.apache.hadoop.mapreduce.lib.fieldsel
 

Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.fieldsel
 class FieldSelectionMapper<K,V>
          This class implements a mapper class that can be used to perform field selections in a manner similar to unix cut.
 

Uses of Mapper in org.apache.hadoop.mapreduce.lib.input
 

Method parameters in org.apache.hadoop.mapreduce.lib.input with type arguments of type Mapper
static void MultipleInputs.addInputPath(Job job, 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.
 

Uses of Mapper in org.apache.hadoop.mapreduce.lib.map
 

Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.map
 class InverseMapper<K,V>
          A Mapper that swaps keys and values.
 class MultithreadedMapper<K1,V1,K2,V2>
          Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper.
 class RegexMapper<K>
          A Mapper that extracts text matching a regular expression.
 class TokenCounterMapper
          Tokenize the input values and emit each word with a count of 1.
 class WrappedMapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
          A Mapper which wraps a given one to allow custom WrappedMapper.Context implementations.
 

Methods in org.apache.hadoop.mapreduce.lib.map that return types with arguments of type Mapper
 Class<? extends Mapper<?,?,?,?>> WrappedMapper.Context.getMapperClass()
           
static
<K1,V1,K2,V2>
Class<Mapper<K1,V1,K2,V2>>
MultithreadedMapper.getMapperClass(JobContext job)
          Get the application's mapper class.
 

Method parameters in org.apache.hadoop.mapreduce.lib.map with type arguments of type Mapper
static
<K1,V1,K2,V2>
void
MultithreadedMapper.setMapperClass(Job job, Class<? extends Mapper<K1,V1,K2,V2>> cls)
          Set the application's mapper class.
 

Uses of Mapper in org.apache.hadoop.mapreduce.lib.reduce
 

Methods in org.apache.hadoop.mapreduce.lib.reduce that return types with arguments of type Mapper
 Class<? extends Mapper<?,?,?,?>> WrappedReducer.Context.getMapperClass()
           
 



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