Flink CEP pattern with multiple temporal constraint

[shishal]

Hi Team,

I have a scenario where I need to detect following pattern for a transaction.

My basic transaction event look like this => Transaction(id,status, eventTime)

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 per transaction if there is any diversion form this pattern.

The number of transaction in a day could be 10-50 million. I am looking for 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

But still I am not sure how to design this pattern. I hope it is possible to design pattern with Flink CEP?

Also if I am not wrong , I need to use PatternTimeoutFunction to trigger alert.

Thanks,

Shishal