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I have a scenario where I need to detect following pattern for a transaction. My basic transaction event look like this => *Transaction(id,status, time)* Transaction goes through following state. BEGIN -> COMPLETE (within 5 day, if this comes then no need to wait for PROCESSING) BEGIN -> PROCESSING (within 1 day) PROCESSING -> PROCESSING (within 1 day, could happen upto 5 days) PROCESSING -> COMPLETE (within 1 day) In plain text, basically when a transaction is initiated it can go from BEGIN to COMPLETE in 5 days. But If its can not be completed within 1 day then it keep sending a PROCESSING event on that day. So this can happen upto 5 day and then finally it can send COMPLETE event. I want to alert if there is any diversion form this pattern. The number of transaction in a day could be 10-50 million. I am evaluating FlinkCEP for this problem. I have gone through their doc https://ci.apache.org/projects/flink/flink-docs-release-1.4/dev/libs/cep.html Is it possible to design this pattern using Flink CEP? Also if I am not wrong , I need to use PatternTimeoutFunction to trigger alert. Regards, Shishal
