Package | Description |
---|---|
org.apache.hadoop.mapred | |
org.apache.hadoop.mapred.lib | |
org.apache.hadoop.mapred.lib.aggregate |
Modifier and Type | Method and Description |
---|---|
protected Mapper<K1,V1,K2,V2> |
MapRunner.getMapper() |
Modifier and Type | Method and Description |
---|---|
Class<? extends Mapper> |
JobConf.getMapperClass()
Get the
Mapper class for the job. |
Modifier and Type | Method and Description |
---|---|
void |
JobConf.setMapperClass(Class<? extends Mapper> theClass)
Set the
Mapper class for the job. |
Modifier and Type | Class and Description |
---|---|
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 <token,freq> pairs. |
Modifier and Type | Method and Description |
---|---|
static void |
MultipleInputs.addInputPath(JobConf conf,
Path path,
Class<? extends InputFormat> inputFormatClass,
Class<? extends Mapper> mapperClass)
|
static <K1,V1,K2,V2> |
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> |
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.
|
Modifier and Type | Class and Description |
---|---|
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.
|
Copyright © 2015 Apache Software Foundation. All rights reserved.