Package org.apache.beam.runners.flink.translation.functions

Class FlinkMergingNonShuffleReduceFunction<K,InputT,AccumT,OutputT,W extends BoundedWindow>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichGroupReduceFunction<WindowedValue<KV<K,InputT>>,WindowedValue<KV<K,OutputT>>>

org.apache.beam.runners.flink.translation.functions.FlinkMergingNonShuffleReduceFunction<K,InputT,AccumT,OutputT,W>

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.GroupReduceFunction<WindowedValue<KV<K,InputT>>,WindowedValue<KV<K,OutputT>>>, org.apache.flink.api.common.functions.RichFunction

public class FlinkMergingNonShuffleReduceFunction<K,InputT,AccumT,OutputT,W extends BoundedWindow>
extends org.apache.flink.api.common.functions.RichGroupReduceFunction<WindowedValue<KV<K,InputT>>,WindowedValue<KV<K,OutputT>>>

Special version of FlinkReduceFunction that supports merging windows.

This is different from the pair of function for the non-merging windows case in that we cannot do combining before the shuffle because elements would not yet be in their correct windows for side-input access.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
FlinkMergingNonShuffleReduceFunction(CombineFnBase.GlobalCombineFn<InputT,AccumT,OutputT> combineFn, WindowingStrategy<Object,W> windowingStrategy, Map<PCollectionView<?>,WindowingStrategy<?,?>> sideInputs, PipelineOptions pipelineOptions)

Method Summary

Modifier and Type	Method	Description
void	open(org.apache.flink.configuration.Configuration parameters)
void	reduce(Iterable<WindowedValue<KV<K,InputT>>> elements, org.apache.flink.util.Collector<WindowedValue<KV<K,OutputT>>> out)

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Details

FlinkMergingNonShuffleReduceFunction

public FlinkMergingNonShuffleReduceFunction(CombineFnBase.GlobalCombineFn<InputT,AccumT,OutputT> combineFn,
 WindowingStrategy<Object,W> windowingStrategy,
 Map<PCollectionView<?>,WindowingStrategy<?,?>> sideInputs,
 PipelineOptions pipelineOptions)

Method Details

open

public void open(org.apache.flink.configuration.Configuration parameters)

Specified by:

open in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

open in class org.apache.flink.api.common.functions.AbstractRichFunction

reduce

public void reduce(Iterable<WindowedValue<KV<K,InputT>>> elements,
 org.apache.flink.util.Collector<WindowedValue<KV<K,OutputT>>> out)
            throws Exception

Specified by:

reduce in interface org.apache.flink.api.common.functions.GroupReduceFunction<K,InputT>

Specified by:

reduce in class org.apache.flink.api.common.functions.RichGroupReduceFunction<WindowedValue<KV<K,InputT>>,WindowedValue<KV<K,OutputT>>>

Throws:

Exception