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https://bravenewgeek.com/you-cannot-have-exactly-once-delivery/
Mar 25, 2015 · To reiterate, there is no such thing as exactly-once delivery. We must choose between the lesser of two evils, which is at-least-once delivery in most cases. This can be used to simulate exactly-once semantics by ensuring idempotency or otherwise eliminating side effects from operations.
https://www.lightbend.com/blog/how-akka-works-at-least-once-message-delivery
Aug 28, 2019 · At-Most-Once or Maybe-Once. As discussed in some detail in part 1, the at-most-once message delivery approach means that when sending a message from a sender to a receiver there is no guarantee that a given message will be delivered. Any given message may be delivered once or it may not be delivered at all.
https://github.com/rebus-org/Rebus/wiki/Delivery-guarantees
May 24, 2017 · At Most Once. The At Most Once delivery guarantee covers the case when you are guaranteed to receive all messages either once, or maybe not at all. This type of delivery guarantee can arise from your messaging system and your code performing its actions in the following order: 1. Remove message from queue 2. Start work transaction 3.
http://cloudcasts.azurewebsites.net/devguide/Default.aspx?id=12006
At-Most-Once Delivery. The postal service is a good example of at-most-once delivery. If I post a letter to a friend it will be delivered to its destination at most once, with a very small chance that it will get lost. There is no way that the receiver will receive two copies of the letter.
https://blog.jonathanoliver.com/messaging-at-least-once-delivery/
Apr 22, 2010 · One of the guarantees behind messaging is guaranteed delivery. Most of us don't give any additional thought to the subject. Until we get into production. While
https://www.rabbitmq.com/reliability.html
Without acknowledgements, message loss is possible during publish and consume operations and only at most once delivery is guaranteed. Detecting Dead TCP Connections with Heartbeats In some types of network failure, packet loss can mean that disrupted TCP connections take a moderately long time (about 11 minutes with default configuration on Linux, for example) to be detected by the operating …
https://stackoverflow.com/questions/50989673/how-does-azure-service-bus-queue-guarantees-at-most-once-delivery
Then how does Microsoft says that Service Bus supports at most once delivery mode. Is it because of the Receive-and-Delete mode which sends messages only once.But then again, if something happens while consumers are processing the message then that valuable info is lost.
https://petabridge.com/blog/akkadotnet-at-least-once-message-delivery/
By default Akka.NET does not guarantee delivery of messages - instead, Akka.NET uses “at most once” message delivery. The reasons why this design decision was made are outlined well here , but I’ll give you the summarized version: guaranteed message delivery is slow, expensive, and adds a large number of moving parts to any application using Akka.NET .
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