Called when persist fails. By default it logs the error. Subclass may override to customize logging and for example send negative acknowledgment to sender. The actor is always stopped after this method has been invoked. Note that the event may or may not have been saved, depending on the type of failure.

protected virtual void OnPersistFailure(
	Exception cause,
	Object event,
	long sequenceNr
)

abstract OnPersistFailure : 
        cause : Exception * 
        event : Object * 
        sequenceNr : int64 -> unit 
override OnPersistFailure : 
        cause : Exception * 
        event : Object * 
        sequenceNr : int64 -> unit