hi~ Can you send your full code ？
Ryan van Huuksloot <[email protected]> 于2022年3月31日周四 22:58写道：
> Hello!
>
> *Problem:*
> I am connecting to a Kafka Source with the Watermark Strategy below.
>
> val watermarkStrategy = WatermarkStrategy
> .forBoundedOutOfOrderness(Duration.of(2, ChronoUnit.HOURS))
> .withTimestampAssigner(new
> SerializableTimestampAssigner[StarscreamEventCounter_V1] {
> override def extractTimestamp(element: StarscreamEventCounter_V1,
> recordTimestamp: Long): Long =
> element.envelopeTimestamp
> })
>
> The Watermarks are correctly getting assigned.
> However, when a reduce function is used the window never terminates
> because the `ctx.getCurrentWatermark()` returns the default value of
> `-9223372036854775808` in perpetuity.
>
> This is the stream code:
>
> stream
> .windowAll(TumblingEventTimeWindows.of(Time.seconds(1))).reduce(_ + _)
>
> The reduce uses this overloaded operator:
>
> @JsonIgnoreProperties(ignoreUnknown = true)
> case class StarscreamEventCounter_V1(
> envelopeTimestamp: Long,
> numberOfEvents: Int = 1
> ) {
> def +(that: StarscreamEventCounter_V1): StarscreamEventCounter_V1 = {
>
> StarscreamEventCounter_V1(this.envelopeTimestamp.min(that.envelopeTimestamp),
> that.numberOfEvents + this.numberOfEvents)
> }
>
>
> *Attempt to Solve:*
> 1. Validate that the Watermark is set on the source
> a. Set a custom trigger to emit a watermark on each event just in case
> 2. Test with aggregate / process functions
> a. Both other functions work properly - window closes and emits to a
> PrintSink
> 3. Change Watermark Generator to a custom generator
> a. Also change time horizons and let run for 1 day - window never
> closes due to the watermark being stuck at the min default. The sink never
> receives the data but the UI says there are records being output!
>
> *Hypothesis:*
> The output id of a reduce function is causing an upstream issue where the
> watermark is no longer assigned to the Window. I haven't been able to lock
> down what exactly is causing the issue though. My thought is that it might
> be a bug given it works for Aggregate/Process.
> It could be a bug in the IndexedCombinedWatermarkStatus, the partial
> watermarks should not be the min default value when I set the watermark per
> event - this is what I will be looking into until I hear back. I validated
> that the watermark is set correctly in CombinedWatermarkStatus.
>
> *Tools:*
> - Flink 1.14.3
> - Scala
> - DataStream API
>
> Any assistance would be great! Happy to provide more context or
> clarification if something isn't clear!
>
> Thanks!
>
> Ryan van Huuksloot
> Data Developer | Data Platform Engineering | Streaming Capabilities
> [image: Shopify]
> <https://www.shopify.com/?utm_medium=salessignatures&utm_source=hs_email>
>
--
Best，
pp
