Class ReduceByKeyStreamlet<R,K,T>
- java.lang.Object
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- org.apache.heron.streamlet.impl.StreamletBaseImpl<R>
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- org.apache.heron.streamlet.impl.StreamletImpl<KeyValue<K,T>>
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- org.apache.heron.streamlet.impl.streamlets.ReduceByKeyStreamlet<R,K,T>
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- All Implemented Interfaces:
Streamlet<KeyValue<K,T>>
,StreamletBase<KeyValue<K,T>>
public class ReduceByKeyStreamlet<R,K,T> extends StreamletImpl<KeyValue<K,T>>
ReduceByKeyStreamlet represents a KVStreamlet that is the result of applying user supplied reduceFn on all elements. ReduceByKeyAndWindowStreamlet's elements are of KeyValue type where the key is KeyWindowInfo<K> type and the value is of type T.
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.heron.streamlet.impl.StreamletBaseImpl
StreamletBaseImpl.StreamletNamePrefix
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Field Summary
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Fields inherited from class org.apache.heron.streamlet.impl.StreamletBaseImpl
name, nPartitions
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Constructor Summary
Constructors Constructor Description ReduceByKeyStreamlet(StreamletImpl<R> parent, SerializableFunction<R,K> keyExtractor, SerializableFunction<R,T> valueExtractor, SerializableBinaryOperator<T> reduceFn)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
doBuild(TopologyBuilder bldr, Set<String> stageNames)
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Methods inherited from class org.apache.heron.streamlet.impl.StreamletImpl
applyOperator, applyOperator, clone, consume, countByKey, countByKeyAndWindow, filter, flatMap, getAvailableStreamIds, getStreamId, join, join, keyBy, keyBy, log, map, reduceByKey, reduceByKey, reduceByKeyAndWindow, reduceByKeyAndWindow, repartition, repartition, setName, setNumPartitions, split, toSink, transform, union, withStream
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Methods inherited from class org.apache.heron.streamlet.impl.StreamletBaseImpl
addChild, build, getChildren, getName, getNumPartitions, isBuilt, isFullyBuilt, setDefaultNameIfNone
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.apache.heron.streamlet.Streamlet
getName, getNumPartitions
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Constructor Detail
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ReduceByKeyStreamlet
public ReduceByKeyStreamlet(StreamletImpl<R> parent, SerializableFunction<R,K> keyExtractor, SerializableFunction<R,T> valueExtractor, SerializableBinaryOperator<T> reduceFn)
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Method Detail
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doBuild
public boolean doBuild(TopologyBuilder bldr, Set<String> stageNames)
- Specified by:
doBuild
in classStreamletBaseImpl<KeyValue<K,T>>
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