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The replication of events between primary and secondary regions is explicitly designed to ensure application resilience during regional disruptions. However, this process is asynchronous, meaning events are not guaranteed to be processed simultaneously in both regions. This implies that during failover, there might be a window where events are not replicated to the secondary region, potentially leading to an "at-most-once" delivery scenario. The Recovery Time Objective (RTO) and Recovery Point Objective (RPO) are crucial metrics here, with AWS aiming for these to be around 360 to 420 seconds, indicating the designed recovery efficiency and the extent of data that could be left unprocessed during a failure.
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