Google Cloud Pub/Sub is a fully managed messaging service provided by Google Cloud that enables asynchronous communication between independent applications. It allows systems to exchange data reliably through a publish subscribe messaging model.By decoupling message producers and consumers, Pub/Sub enables scalable and resilient application architectures. Messages are delivered quickly while ensuring durability and reliability across distributed systems.

• Asynchronous Messaging: Enables communication between services without direct dependencies.
• High Scalability: Automatically scales to handle millions of messages per second.
• Reliable Message Delivery: Ensures durable message storage and delivery to subscribers.
• Event-Driven Architecture Support: Integrates with services such as Google Cloud Dataflow and Google Cloud Functions.

Core Terminologies in Google Cloud Pub/Sub

Understanding the core components of Pub/Sub helps in designing efficient messaging systems.

1. Publisher

A Publisher is an application or service that sends messages to a Pub/Sub topic.

• Generates and sends messages to a specific topic.
• Can be an application, microservice, or external system.
• Supports publishing messages through APIs or client libraries.
• Allows multiple publishers to send messages to the same topic.

2. Subscriber

A Subscriber is an application that receives messages from a subscription linked to a topic.

• Pulls or receives messages published to the topic.
• Processes messages for tasks such as notifications or analytics.
• Supports push and pull delivery models.
• Can acknowledge messages after successful processing.

3. Topic

A Topic is a named resource where publishers send messages.

• Acts as a central channel for message distribution.
• Allows multiple publishers to send messages to the same topic.
• Can have multiple subscriptions attached to it.
• Serves as the entry point for all published messages.

4. Subscription

A Subscription represents the stream of messages delivered from a topic to a subscriber.

• Connects a subscriber application to a specific topic.
• Enables reliable delivery of messages from the topic.
• Supports push and pull message delivery.
• Allows multiple subscribers to receive messages from the same topic.

Steps To Creating a Pub/Sub Topic

Step 1: Log in to the Google Cloud Console.

After Login to your GCP account, you can view the menu with a list of Google Cloud Products and Services by clicking the Navigation menu at the top-left.

Step 2: Navigate to the "Pub/Sub" > "Topics" in the left navigation bar.

Step 3: Click on "Create Topic".

Step 4: In the "Create topic" dialog box, enter a name for the topic in the "Topic ID" field.

1. The topic must have a unique name.
2. Leave other fields at their default value.
3. Click CREATE.

Step 5: Your Pub/Sub topic is now created.

Common Use Cases of Pub/Sub

Google Cloud Pub/Sub is widely used in modern cloud architectures for various scenarios.

1. Event-driven microservices communication.
2. Real-time analytics and streaming pipelines.
3. Notification systems and alerts.
4. Log ingestion and monitoring pipelines.