com.cloudera.crunch.lib
Class Aggregate.TopKCombineFn<K,V>

java.lang.Object
  com.cloudera.crunch.DoFn<Pair<S,Iterable<T>>,Pair<S,T>>
      com.cloudera.crunch.CombineFn<Boolean,Pair<K,V>>
          com.cloudera.crunch.lib.Aggregate.TopKCombineFn<K,V>

All Implemented Interfaces:

Serializable

Enclosing class:

Aggregate

public static class Aggregate.TopKCombineFn<K,V>
extends CombineFn<Boolean,Pair<K,V>>

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

Aggregate.TopKCombineFn(int limit, boolean maximize)

Method Summary

void	process(Pair<Boolean,Iterable<Pair<K,V>>> input, Emitter<Pair<Boolean,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

Aggregate.TopKCombineFn

public Aggregate.TopKCombineFn(int limit,
                               boolean maximize)

Method Detail

process

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

Description copied from class: DoFn

Processes the records from a PCollection.

Specified by:

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

Parameters:

input - The input record

emitter - The emitter to send the output to