org.apache.crunch.fn

Class SFunction2<K,V,R>

java.lang.Object

org.apache.crunch.DoFn<S,T>

org.apache.crunch.MapFn<T,R>

org.apache.crunch.fn.SFunction2<K,V,R>

All Implemented Interfaces:

Serializable, org.apache.spark.api.java.function.Function2<K,V,R>

public abstract class SFunction2<K,V,R>
extends MapFn<T,R>
implements org.apache.spark.api.java.function.Function2<K,V,R>

A Crunch-compatible abstract base class for Spark's Function2. Subclasses of this class may be used against either Crunch PCollections or Spark RDDs.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SFunction2()

Method Summary

Modifier and Type	Method and Description
void	cleanup(Emitter<R> emitter) Called during the cleanup of the MapReduce job this DoFn is associated with.
void	initialize() Initialize this DoFn.
R	map(Pair<K,V> input) Maps the given input into an instance of the output type.

Methods inherited from class org.apache.crunch.MapFn

process, scaleFactor

Methods inherited from class org.apache.crunch.DoFn

configure, disableDeepCopy, setConfiguration, setContext

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.spark.api.java.function.Function2

call

Constructor Detail

SFunction2

public SFunction2()

Method Detail

map

public R map(Pair<K,V> input)

Description copied from class: MapFn

Maps the given input into an instance of the output type.

Specified by:

map in class MapFn<Pair<K,V>,R>

initialize

public final void initialize()

Description copied from class: DoFn

Initialize this DoFn. This initialization will happen before the actual DoFn.process(Object, Emitter) is triggered. Subclasses may override this method to do appropriate initialization.

Called during the setup of the job instance this DoFn is associated with.

Overrides:

initialize in class DoFn<T,R>

cleanup

public final void cleanup(Emitter<R> emitter)

Description copied from class: DoFn

Called during the cleanup of the MapReduce job this DoFn is associated with. Subclasses may override this method to do appropriate cleanup.

Overrides:

cleanup in class DoFn<T,R>

Parameters:

emitter - The emitter that was used for output