Package org.apache.flink.streaming.runtime.watermark

Class AlignedWatermarkCombiner

java.lang.Object

org.apache.flink.streaming.runtime.watermark.AlignedWatermarkCombiner

All Implemented Interfaces:

WatermarkCombiner

public class AlignedWatermarkCombiner
extends Object
implements WatermarkCombiner

A WatermarkCombiner is design to align Watermarks. It will combine watermarks after receiving watermarks from all upstream input channels.

The combine process will perform the following three steps: (1) send the combined watermark (actually the last received watermark) to downstream, (2) clear the received watermarks, (3) resume input gate.

Note that the aligned Watermarks should have the same value within a batch.

Constructor Summary

Constructors

Constructor	Description
AlignedWatermarkCombiner(int numberOfInputChannels, Runnable gateResumer)

Method Summary

Modifier and Type	Method	Description
void	combineWatermark(org.apache.flink.api.common.watermark.Watermark watermark, int channelIndex, Consumer<org.apache.flink.api.common.watermark.Watermark> watermarkEmitter)

Methods inherited from class java.lang.Object

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

Constructor Detail

AlignedWatermarkCombiner

public AlignedWatermarkCombiner(int numberOfInputChannels,
                                Runnable gateResumer)

Method Detail

combineWatermark

public void combineWatermark(org.apache.flink.api.common.watermark.Watermark watermark,
                             int channelIndex,
                             Consumer<org.apache.flink.api.common.watermark.Watermark> watermarkEmitter)
                      throws Exception

Specified by:

combineWatermark in interface WatermarkCombiner

Throws:

Exception