Hi Jark, I got you. We have discussed this question in Flink Forward 2019. I know that i can custom operator to resolve this problem. but also has some other problems:
First, This is a very common scene that we often meet I have to rewrite "BroadcastConnectedStream","ConnectedStreams" ... and "TwoInputStreamOperator" and rewrite "SingleOutputStreamOperator" bucause it's "protected", It's unfriendly for new user. Second. One stream even don't call "assignTimestampsAndWatermarks" method, It's mean this stream don't have time and watermark, It don't have time and watermark why It have a hand in computing of watermak and time default. Best Jark Jark Wu <imj...@gmail.com> 于2019年12月24日周二 下午12:08写道： > > Hi Ocean, > > You can implement your custom operator by the "TwoInputStreamOperator" > interface. > The TwoInputStreamOperator interface provides "processWatermark1" and > "processWatermark2" which handles > watermarks for left stream and right stream. You can then ignore the > watermarks from right stream and forward > watermark from left stream. > > Best, > Jark > > On Mon, 23 Dec 2019 at 21:47, Jocean shi <jocean....@gmail.com> wrote: > > > Hi all: > > Currently, The "TwoInputStreamOperator" such as > > "CoBroadcastWithKeyedOperator" "KeyedCoProcessOperator" and the > > (Co)stream such as "ConnectedStreams" "BroadcastConnectedStream" only > > support compute watermark by two stream. > > but we just need one stream to compute watermark in some case. > > For example: one stream is only rule data or control command, it > > don't hava event time. > > I think user has right to choose which stream to compute watermark. > > > > Best > > Ocean > >
