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From Aljoscha Krettek <aljos...@apache.org>
Subject Re: WaterMark & Eventwindow not fired correctly
Date Tue, 08 Aug 2017 14:33:00 GMT

So I understood that you have roughly this pipeline:

Input 1 --\
           |- CoFlatMap - TimestampAndWatermarkAssigner - KeyBy - Window    
Input 2 --/

If the timestamp assigner is after the CoFlatMap the processInput() method of the extractor
should still be called. Not by the StreamInputProcessor but by ChainingOutput [1], which basically
connects the Two-Input CoFlatMap to the one-input operator that comes after that. The could
still be a bug in there somewhere, however.

Could you maybe send me the relevant parts of your code, so that I can have a look. Or provide
a minimal example.


[1] https://github.com/apache/flink/blob/6f5fa7f741538207244368c275bee9958c43a25a/flink-streaming-java/src/main/java/org/apache/flink/streaming/runtime/tasks/OperatorChain.java#L394

> On 7. Aug 2017, at 19:21, aitozi <gjying1314@gmail.com> wrote:
> Hi,
> my flink version is 1.2
> i am work on this problem these days. Below is my found.
> when i use "assignTimestampsAndWatermark" with same parallelism as 240 as
> the before operator, the before operator has two input(it is a "connected"
> Co-FlatMap operator with parallelism 240), it runs into that the watermark
> didn't update.
> the i look into the source code, that the
> StreamTwoInputProcessor.java#processInput called by TwoInputStreamTask has
> method with processElement1() and processElement2() method, but all of them
> do not run processElement in StreamInputProcessor to extractTimestamp(shown
> in TimestampsAndPeriodicWatermarksOperator)
> so that, the timestamp is not update, and my waterMark is update just like
> the class BoundedOutOfOrdernessTimestampExtractor .
> So, is it a bug that the timestamp is not update when deal with a two input
> stream.
> Ps: my English is not very good , i dont know can you understand me :)
> thanks,
> aitozi
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