Any standardized components to generate watermarks based on processing time in an event time stream when there is no data from a source?
The docs for event time [1] indicate that people are doing this, but the only suggestion on Stack Overflow [2] is to make every window operator in stream have a special processing time trigger, which seems clumsy and error prone if you have many jobs and many windows. I'm thinking there might be a watermark generator that can be plugged into the kafka consumer to make it generate processing time watermarks when there are no messages? Or maybe a standardized operator that can be inserted into the beginning of each stream, just after the source, to generate such idle-source processing time watermarks in event time streams? 1. "Note that sometimes when event time programs are processing live data in real-time, they will use some processing time operations in order to guarantee that they are progressing in a timely fashion." 2. https://stackoverflow.com/questions/46432368/flink-window-does-not-process-data-at-end-of-stream
