Data Delivery Semantic
Three options for data delivery and processing
At most once delivery
At least once delivery
Exactly once delivery
At most once delivery semantic
• Systems used for monitoring purposes
• Important to inform the admins about the problems
• Not all data transmissions required
• Down-sample the data to improve performance
• Data loss is approximately known
Exactly once delivery semantic
• Financial systems or advertising systems
• Every message has to be delivered only once
• Data loss not affordable as it might be revenue loss
• Achieved through queuing systems like ActiveMQ, RabbitMQ
• Usually queue semantics implemented on server side
At least once delivery semantic
• Balance two extremes by providing reliable message delivery by pushing the message handling
semantics to the consumer
• Consumers are free to implement message handling without bothered about other consumers
• Dependent on application logic and handled in application level only
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