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

Class LongWatermarkCombiner

java.lang.Object

org.apache.flink.streaming.runtime.watermark.LongWatermarkCombiner

All Implemented Interfaces:

WatermarkCombiner

public class LongWatermarkCombiner
extends Object
implements WatermarkCombiner

A WatermarkCombiner for unaligned LongWatermarks.

The combination process will perform the following steps: (1) determine if it satisfies the condition of WatermarkCombinationPolicy.isCombineWaitForAllChannels(), (2) calculate the combined watermark value, (3) send the combined watermark to downstream only when the value differs from the previous sent one or if it's the first time sending.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	LongWatermarkCombiner.LongWatermarkElement	This class implements HeapPriorityQueue.HeapPriorityQueueElement to help find the maximum/minimum LongWatermark.

Constructor Summary

Constructors

Constructor	Description
LongWatermarkCombiner(org.apache.flink.api.common.watermark.WatermarkCombinationPolicy combinationPolicy, int numberOfInputChannels)

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

LongWatermarkCombiner

public LongWatermarkCombiner(org.apache.flink.api.common.watermark.WatermarkCombinationPolicy combinationPolicy,
                             int numberOfInputChannels)

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)

Specified by:

combineWatermark in interface WatermarkCombiner