| Modifier and Type | Method and Description |
|---|---|
Class<? extends Mapper<?,?,?,?>> |
JobContext.getMapperClass()
Get the
Mapper class for the job. |
| Modifier and Type | Method and Description |
|---|---|
void |
Job.setMapperClass(Class<? extends Mapper> cls)
Set the
Mapper for the job. |
| Modifier and Type | Class and Description |
|---|---|
class |
ValueAggregatorMapper<K1 extends WritableComparable<?>,V1 extends Writable>
This class implements the generic mapper of Aggregate.
|
| Modifier and Type | Class and Description |
|---|---|
class |
ChainMapper<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
The ChainMapper class allows to use multiple Mapper classes within a single
Map task.
|
| Modifier and Type | Method and Description |
|---|---|
static void |
ChainMapper.addMapper(Job job,
Class<? extends Mapper> klass,
Class<?> inputKeyClass,
Class<?> inputValueClass,
Class<?> outputKeyClass,
Class<?> outputValueClass,
Configuration mapperConf)
Adds a
Mapper class to the chain mapper. |
static void |
ChainReducer.addMapper(Job job,
Class<? extends Mapper> klass,
Class<?> inputKeyClass,
Class<?> inputValueClass,
Class<?> outputKeyClass,
Class<?> outputValueClass,
Configuration mapperConf)
Adds a
Mapper class to the chain reducer. |
| Modifier and Type | Class and Description |
|---|---|
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.
|
| Modifier and Type | Method and Description |
|---|---|
static void |
MultipleInputs.addInputPath(Job job,
Path path,
Class<? extends InputFormat> inputFormatClass,
Class<? extends Mapper> mapperClass)
|
| Modifier and Type | Class and Description |
|---|---|
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
Mapper.Context implementations. |
| Modifier and Type | Method and Description |
|---|---|
static <K1,V1,K2,V2> |
MultithreadedMapper.getMapperClass(JobContext job)
Get the application's mapper class.
|
| Modifier and Type | Method and Description |
|---|---|
static <K1,V1,K2,V2> |
MultithreadedMapper.setMapperClass(Job job,
Class<? extends Mapper<K1,V1,K2,V2>> cls)
Set the application's mapper class.
|
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