When you observe the following restrictions the correlator’s recovery behavior is straightforward:

EPL code that adheres to these restrictions appears to behave as if it is running in a completely reliable and fault tolerant system. The downside is that while the correlator is down, incoming or outgoing events are dropped. If you implement a "retransmit until acknowledge" protocol then the correlator can have a large number of events (and retransmits) to process when it restarts, depending on how long it is down.