Uses of Interface org.apache.hadoop.mapred.Mapper (Hadoop 1.2.1 API)
Date: 2013-07-22

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## 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.

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