com.cloudera.crunch.fn
Class MapKeysFn<K1,K2,V>

java.lang.Object
  com.cloudera.crunch.DoFn<Pair<K1,V>,Pair<K2,V>>
      com.cloudera.crunch.fn.MapKeysFn<K1,K2,V>

All Implemented Interfaces:

Serializable

public abstract class MapKeysFn<K1,K2,V>
extends DoFn<Pair<K1,V>,Pair<K2,V>>

See Also:

Serialized Form

Constructor Summary

MapKeysFn()

Method Summary

abstract K2	map(K1 k1)
void	process(Pair<K1,V> input, Emitter<Pair<K2,V>> emitter) Processes the records from a PCollection.

Methods inherited from class com.cloudera.crunch.DoFn

cleanup, configure, getConfiguration, getCounter, getCounter, getStatus, getTaskAttemptID, initialize, progress, scaleFactor, setConfigurationForTest, setContext, setStatus

Methods inherited from class java.lang.Object

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

Constructor Detail

MapKeysFn

public MapKeysFn()

Method Detail

process

public void process(Pair<K1,V> input,
                    Emitter<Pair<K2,V>> emitter)

Description copied from class: DoFn

Processes the records from a PCollection.

Specified by:

process in class DoFn<Pair<K1,V>,Pair<K2,V>>

Parameters:

input - The input record

emitter - The emitter to send the output to

map

public abstract K2 map(K1 k1)