September 2025
Intermediate to advanced
192 pages
5h 16m
English
Content preview from Think Distributed Systems
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4 Message delivery and processing
This chapter covers
- Message delivery and message processing
- At-least-once, at-most-once, and exactly-once delivery and processing
- Equivalence and idempotence
When we talk about message delivery and processing, we may come across numerous misconceptions and instances of borderline deception, which can be detrimental to forming accurate, concise mental models and can cloud our understanding. Some distributed system engineers use the term exactly-once processing, for example, but what they really mean is exactly-once processing semantics. Exactly-once processing refers to the ideal scenario in which each message is processed only once, whereas exactly-once processing semantics means that the system behaves ...
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