Just as message queuing, pub-sub (publish-subscribe) pattern moves information from producer to a consumer. However the major difference here is this pattern allows multiple consumers to receive each message in a topic. It ensures that the consumer receives messages in a topic in exact same order in which it was received in the messaging system. This pattern can be better understood by taking a real life scenario. Consider a stock market. It is used by large number of people and applications, all of whom should be send messages real time and just the exact sequence of prices. There is a huge difference between a stock going up to down and stock going down to up. Lets see an example Apache Kafka is one of the ...
Introduction to pub/sub pattern
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