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Introduction

What is google pub sub?​

Pub/Sub, a Google Cloud service designed for asynchronous messaging. It essentially acts as a "post office" that allows different software services to communicate without being directly connected.

Core Concept​

In a Pub/Sub system, there are two main roles:

  • Publishers: Send messages (events) to a "topic" without needing to know who will receive them.
  • Subscribers: Listen to those topics to receive and process the messages.

Why Use It?​

  • Decoupling: Services don't need to wait for each other to finish a task, which makes the whole system more flexible and reliable.
  • Scalability: It can handle massive amounts of data with very low latency (around 100 milliseconds).
  • Parallelism: Unlike some other systems, it can "lease" individual messages to multiple workers at once, maximizing speed.

Common Use Cases​

  • Streaming Analytics: Ingesting user clicks or server logs to be analyzed in real-time by tools like Dataflow.
  • Data Distribution: Syncing data across different databases or sharing business events across an entire company.
  • Task Queues: Distributing heavy workloads (like resizing images or sending emails) among many worker services.
  • IoT Integration: Streaming data from sensors or devices into a processing pipeline.