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https://blog.jonathanoliver.com/messaging-at-least-once-delivery/
Apr 22, 2010 · One of the primary reasons, if not the primary reason, that messaging systems offer at-least-once delivery rather than exactly-once delivery is that we run into limitations as expressed in the CAP theorem—all "nodes" cannot possibly have a globally consistent snapshot and be available and partition tolerant. There is no unfailing "global brain".
https://www.cloudcomputingpatterns.org/at_least_once_delivery/
At-least-once Delivery. In case of failures that lead to message loss or take too long to recover from, messages are retransmitted to assure they are delivered at least once.
https://getakka.net/articles/persistence/at-least-once-delivery.html
At-Least-Once Delivery. To send messages with at-least-once delivery semantics to destinations you can mix-in AtLeastOnceDelivery class to your PersistentActor on the sending side. It takes care of re-sending messages when they have not been confirmed within a configurable timeout.
https://www.lightbend.com/blog/how-akka-works-at-least-once-message-delivery
Aug 28, 2019 · With the at-least-once approach for sending messages either the message sender or the message receiver or both actively participate in ensuring that every message is delivered at least once. To ensure that each message is delivered either the message sender must detect message delivery failures and resend upon failure, or the message receiver must continuously request messages that have not been delivered.
https://bravenewgeek.com/you-cannot-have-exactly-once-delivery/
Mar 25, 2015 · Every major message queue in existence which provides any guarantees will market itself as at-least-once delivery. If it claims exactly-once, it’s because they are lying to your face in hopes that you will buy it or they themselves do not understand distributed systems. Either way, it’s not a …
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