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

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

Packages that use Mapper
org.apache.hadoop.examples | Hadoop example code.
org.apache.hadoop.mapreduce |
org.apache.hadoop.mapreduce.lib.fieldsel |
org.apache.hadoop.mapreduce.lib.input |
org.apache.hadoop.mapreduce.lib.map |

Uses of Mapper in org.apache.hadoop.examples

Subclasses of Mapper in org.apache.hadoop.examples
`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.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.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

Subclasses of Mapper in org.apache.hadoop.mapreduce.lib.input
`class` | `DelegatingMapper<K1,V1,K2,V2>` An `Mapper` that delegates behavior of paths to multiple other mappers.

Method parameters in org.apache.hadoop.mapreduce.lib.input with type arguments of type Mapper
`static void` | `MultipleInputs.addInputPath(Job job, 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` | `TokenCounterMapper` Tokenize the input values and emit each word with a count of 1.

Methods in org.apache.hadoop.mapreduce.lib.map that return types with arguments of type Mapper
`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.

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