com.cloudera.crunch
Class CombineFn.AggregatorCombineFn<K,V>

java.lang.Object
  com.cloudera.crunch.DoFn<Pair<S,Iterable<T>>,Pair<S,T>>
      com.cloudera.crunch.CombineFn<K,V>
          com.cloudera.crunch.CombineFn.AggregatorCombineFn<K,V>

All Implemented Interfaces:

Serializable

Enclosing class:

CombineFn<S,T>

public static class CombineFn.AggregatorCombineFn<K,V>
extends CombineFn<K,V>

A CombineFn that delegates all of the actual work to an Aggregator instance.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.cloudera.crunch.CombineFn

CombineFn.Aggregator<T>, CombineFn.AggregatorCombineFn<K,V>, CombineFn.AggregatorFactory<T>, CombineFn.FirstNAggregator<V>, CombineFn.LastNAggregator<V>, CombineFn.MaxBigInts, CombineFn.MaxDoubles, CombineFn.MaxFloats, CombineFn.MaxInts, CombineFn.MaxLongs, CombineFn.MaxNAggregator<V extends Comparable<V>>, CombineFn.MinBigInts, CombineFn.MinDoubles, CombineFn.MinFloats, CombineFn.MinInts, CombineFn.MinLongs, CombineFn.MinNAggregator<V extends Comparable<V>>, CombineFn.PairAggregator<V1,V2>, CombineFn.QuadAggregator<A,B,C,D>, CombineFn.SumBigInts, CombineFn.SumDoubles, CombineFn.SumFloats, CombineFn.SumInts, CombineFn.SumLongs, CombineFn.TripAggregator<A,B,C>, CombineFn.TupleNAggregator

Field Summary

Fields inherited from class com.cloudera.crunch.CombineFn

MAX_BIGINTS, MAX_DOUBLES, MAX_FLOATS, MAX_INTS, MAX_LONGS, MIN_BIGINTS, MIN_DOUBLES, MIN_FLOATS, MIN_INTS, MIN_LONGS, SUM_BIGINTS, SUM_DOUBLES, SUM_FLOATS, SUM_INTS, SUM_LONGS

Constructor Summary

CombineFn.AggregatorCombineFn(CombineFn.Aggregator<V> aggregator)

Method Summary

void	process(Pair<K,Iterable<V>> input, Emitter<Pair<K,V>> emitter) Processes the records from a PCollection.

Methods inherited from class com.cloudera.crunch.CombineFn

aggregator, aggregatorFactory, FIRST_N, LAST_N, MAX_BIGINTS, MAX_BIGINTS, MAX_DOUBLES, MAX_DOUBLES, MAX_FLOATS, MAX_FLOATS, MAX_INTS, MAX_INTS, MAX_LONGS, MAX_LONGS, MIN_BIGINTS, MIN_BIGINTS, MIN_DOUBLES, MIN_DOUBLES, MIN_FLOATS, MIN_FLOATS, MIN_INTS, MIN_INTS, MIN_LONGS, MIN_LONGS, pairAggregator, quadAggregator, SUM_BIGINTS, SUM_DOUBLES, SUM_FLOATS, SUM_INTS, SUM_LONGS, tripAggregator, tupleAggregator

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

CombineFn.AggregatorCombineFn

public CombineFn.AggregatorCombineFn(CombineFn.Aggregator<V> aggregator)

Method Detail

process

public void process(Pair<K,Iterable<V>> input,
                    Emitter<Pair<K,V>> emitter)

Description copied from class: DoFn

Processes the records from a PCollection.

Specified by:

process in class DoFn<Pair<K,Iterable<V>>,Pair<K,V>>

Parameters:

input - The input record

emitter - The emitter to send the output to