What is Cloud Pub/Sub ?



The publish/subscribe (pub/sub) pattern is a straightforward but effective architectural design pattern for messaging applications. Pub/sub messaging can be used for spreading events, propagating logs to many places, and populating distributed caches, among other things.

The pub/sub pattern is a method of constructing message exchanges between entities such as services. Rather than interacting directly with one another, services in the pub/sub pattern can communicate through a message broker. This strategy separates the concerns of publishers and subscribers, allowing publishers to concentrate just on publishing and subscribers to concentrate solely on the publications to which they are subscribed. The resulting structure enables asynchronous message sending and receiving by a task-specific broker, which is one of various approaches to construct event-based systems.

Publishers forward messages to a broker under the pub/sub model. The broker is a specific component that organises messages into appropriate delivery categories before either pushing them out to subscribers or allowing subscribers to retrieve messages they want down, depending on how the broker is configured.

To route the message to the relevant recipient or receivers, the broker could employ information provided by the message publisher, such as a channel or topic identification. Message recipients connect to the broker and subscribe to messages based on the same data, so they only see messages that are relevant to them. Publishers, on the other hand, have no idea how many subscribers receive their messages, therefore the size and scope of the subscriber base has no bearing on them.

As a result, as compared to alternative message exchange patterns, the pub/sub pattern gives enhanced scalability to applications. The only thing that connects the parties is the content and metadata of the messages, and there are (theoretically) no hard constraints on the number of participants or message throughput.

The following are the main characteristics of Pub/Sub:

  • Scalable and completely manageable.
  • Messaging on a global scale.
  • Pull and push modes are available.
  • Deliveries made to order (Beta).
  • At the very least, once delivery
  • Topic for a dead letter: Messages that subscriber programmes are unable to process will be saved for offline troubleshooting.
  • Filtering: To limit the volume of messages delivered to subscribers, Pub/Sub can filter messages based on attributes.





References: 

  1. https://ieeexplore.ieee.org/document/9604746/
  2. https://ieeexplore.ieee.org/document/6138542
  3. https://www.google.com/aclksa=l&ai=DChcSEwjDnK7wtqL1AhVWPmAKHXl1CXgYABAAGgJ0bQ&ae=2&sig=AOD64_2xWVDzXOVp9LzdQ6wYSCR7AFnrJw&q&nis=1&adurl&ved=2ahUKEwj0xaXwtqL1AhUFs1YBHSHrCisQ0Qx6BAgCEAE
  4. https://cloud.google.com/pubsub/docs/overview

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