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https://bravenewgeek.com/you-cannot-have-exactly-once-delivery/
Mar 25, 2015 · “The way we achieve exactly-once delivery in practice is by faking it. Either the messages themselves should be idempotent, meaning they can be applied more than once without adverse effects, or we remove the need for idempotency through deduplication.” If the message only writes exactly once then that’s successful exactly-once semantics.
https://it.toolbox.com/question/once-only-delivery-081203
Exactly Once delivery refers to coordination between a message receiver and an XA compliant resource (like a database that logs the message). You can use RVTX to affect this, or in E4JMS, full XA support is
https://answers.sap.com/questions/1242316/message-queuing-and-once-only-delivery-question.html
In the Websphere world Websphere uses MQ as it's queuing mechanism internally to guarantee once-only delivery of messages. Now I know XI can integrate with MQ (or other messaging systems, JMS,etc...)but certainly XI guarantees once-only delivery without any of those components.
https://stackoverflow.com/questions/50989673/how-does-azure-service-bus-queue-guarantees-at-most-once-delivery
Exactly Once delivery is basically not possible in general case: there's always a chance that consuming application will crash at wrong time just before completing the message, and then the message will be re-delivered. You should strive to implement Effectively Once processing. This is usually achieved with idempotent message processor.
https://techcrunch.com/2017/06/30/confluent-achieves-holy-grail-of-exactly-once-delivery-on-kafka-messaging-service/
Jun 30, 2017 · Most people believed that “exactly once” was an unattainable goal, that it would come at too high a trade-off in terms of delivery speed versus the ability to do this, but Narkhede says, the ...
https://www.baeldung.com/kafka-exactly-once
Nov 06, 2018 · Initially, Kafka only supported at-most-once and at-least-once message delivery. However, the introduction of Transactions between Kafka brokers and client applications ensures exactly-once delivery in Kafka. To understand it better, let's quickly …
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.quora.com/What-days-does-USPS-deliver-twice-in-the-same-day
Apr 11, 2019 · The USPS only delivers once each day to each address. The only exception is during the Christmas season due to the heavy parcel load. During the Christmas season, carriers will report to work early and deliver a portion of the parcels for the day. The carriers will return to the office and sort and deliver their mail as on a normal day.
https://www.wholefoodsmarket.com/grocery-delivery-and-pickup
Free 2-hour Delivery. Just for Prime members — skip the lines, skip the traffic and get your Whole Foods Market favorites delivered with Prime. Getting your groceries is easy. Shop with Prime. Exclusively for Prime members in select ZIP codes. Inventory and delivery may be temporarily unavailable due to increased demand.
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