I have looked into the CEP library. I have posted  an issued on
stackoverflow.

https://stackoverflow.com/questions/49047879/global-windows-in-flink-using-custom-triggers-vs-flink-cep-pattern-api

However the pattern matches all possible solution on the stream of
events.Does pattern have a notion of Evictor? How can you keep only the
specific set of events.

This question has not been answered and there seems to be a similar question 

https://stackoverflow.com/questions/48028061/flink-cep-greedy-matching

Thanks



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