Hello Flink Community,
I have a question regarding combining two independant streams.
The first stream is a stream of events with metrics information. It occurs
every 10 seconds. What I want is to join a second stream with events from an
application. The result should be an event with the metrics and the events that
happened the last 10 seconds.
So my first approacch was to generate an ID which will be increased after every
metric event. This ID will be added to the application events and of cours for
the current metric event. This works somehow good for live events but for
recalculating past events the two streams have to start at the same point in
event time.
The second approach was to generate a time window of 10 seconds for the
application events and for the metrics and set the window end time as a key
because flink windows end at e.g. 11:01:10, then 11:01:20 and so on. But this
approach works only for past events because flink needs another application
event to know that 10 seconds have passed for the application events window.
I hope you guys understand the problem. Is there a way two combine them in a
nice way? I don't want to generate empty "heartbeats" for the application event
stream.
Thanks for your help.
Greetings
Markus
