February 26-28, 2020
Montreal, Canada

Excuse me, my bill does not match my order

In a distributed system messages sometimes get lost or duplicated. That's a fact of life. It is really hard to execute business logic that assumes one trigger equals one outcome when a trigger can be lost or fire twice.

One way of dealing with the problem is taking advantage of natural idempotency of some operations, e.g. adding element to a set. But let's face it, most code is more complex than that. Join me an explore some alternatives.

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Szymon Pobiega

Particular Software

Szymon works an engineer at Particular Software, the makers of NServiceBus. His main areas of expertise are Domain-Driven Design and asynchronous messaging. He is especially interested in the intersection of these two topics -- in the patterns and tools for ensuring all messages are processed exactly once and in the correct order.

Szymon is a co-author of https://exactly-once.github.io/, a site dedicated to correct message processing.

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