Cloud Pub/Sub

Pub/Sub is a messaging and event ingestion service that acts as the glue between loosely coupled systems. It allows us to send and receive messages between independent applications while decoupling the publishers of events and subscribers to those events. This means that the publishers do not need to know anything about their subscribers. Pub/Sub is fully managed, so it offers scale at ease, making it perfect for a modern stream analytics pipeline.

There are some core concepts that you should understand:

• A publisher is an application that will create and send messages to a topic.
• A topic is a resource that messages are sent to by publishers.
• A subscription represents the stream of messages from a single topic to be delivered to the subscribing application. Subscribers will either receive the message through pull or push, meaning Pub/Sub pushes the messages to the endpoint using a webhook, or the message is pulled by the application using HTTPS requests...