Apama Documentation : Developing Apama Applications : Developing Apama Applications in EPL : Using Correlator Persistence : How the correlator recovers state : Simplest recovery use case
Simplest recovery use case
When you observe the following restrictions, the correlator's recovery behavior is straightforward:
*All monitors are persistent. The correlator contains no chunks.
*There are no implementations of onBeginRecovery() or onConcludeRecovery() actions.
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.
Copyright © 2013-2017 Software AG, Darmstadt, Germany. (Innovation Release)

Product LogoContact Support   |   Community   |   Feedback