📣Google Cloud Pub/Sub

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Also known as: Pub/Sub

A globally distributed messaging service for asynchronous communication between services.

DESCRIPTION

Google Cloud Pub/Sub enables publish-subscribe messaging with topics and subscriptions for decoupled systems. It provides durable storage, high throughput, and at-least-once delivery, with features like push/pull, filtering, ordering, and dead-letter queues. Pub/Sub integrates with Dataflow, Functions, and other GCP services to power event-driven pipelines. It scales globally and supports cross-region replication. Typical uses include streaming ingestion, microservice decoupling, and real-time notifications.

ALTERNATIVE DEFINITIONS

Google Cloud

Pub/Sub is a fully managed real-time messaging service that allows you to send and receive messages between independent applications.

Emphasizes fully managed and decoupled applications communication.

Source

Wikipedia

Google Cloud Pub/Sub is a messaging service that sends and receives messages between applications.

Concise description of core messaging capabilities.

Source

RELATED TERMS

Event-Driven Architecture Messaging Topic Subscription Cloud Dataflow Streaming Queue Exactly-once At-least-once

COMPETING TERMS

Apache Kafka Amazon SNS/SQS

KNOWLEDGE AREAS

Real-time & Streaming Data Cloud Data Engineering Data Integration & Interoperability

TARGET AUDIENCE

Data Engineer Software Developer Cloud Architect DevOps Engineer MLOps Engineer

EXTERNAL SOURCES

• Wikipedia - Google Cloud Pub/Sub
• Google Cloud - Overview of Pub/Sub
• Google Cloud Architecture - Push vs. pull patterns
• Google Cloud - Subscriber documentation

TOP QUESTIONS

How does Google Cloud Pub/Sub support decoupling?

Publishers and subscribers communicate via topics, allowing independent scaling, failure isolation, and asynchronous workflows.

Category: Definition

What delivery semantics does Google Cloud Pub/Sub provide?

It provides at-least-once delivery by default, with ordering keys and exactly-once processing options using Dataflow patterns.

Category: Requirements

What are common mistakes with Google Cloud Pub/Sub?

Ignoring backpressure, insufficient acknowledgment deadlines, and unbatched processing can cause timeouts and increased costs.

Category: Mistakes

How does Google Cloud Pub/Sub compare to Apache Kafka?

Pub/Sub is managed, globally available, and integrates with GCP; Kafka offers fine-grained control and on-prem options but needs ops expertise.

Category: Comparison

What is currently a hot topic around Google Cloud Pub/Sub?

Using Pub/Sub with Dataflow and BigQuery for streaming analytics pipelines is increasingly popular.

Category: Topic

How can I filter messages in Google Cloud Pub/Sub?

Subscription filters allow attribute-based message selection, reducing downstream processing.

Category: HowTo

What’s the risk of mismanaging Google Cloud Pub/Sub subscriptions?

Poor acknowledgment handling can cause message redelivery, increased latency, and higher resource consumption.

Category: Risks

How do push and pull subscriptions differ in Google Cloud Pub/Sub?

Push delivers messages via HTTPS to endpoints; pull requires clients to fetch messages, offering more control.

Category: Comparison

How is Google Cloud Pub/Sub secured?

Use IAM for topic/subscription access, VPC Service Controls, and authenticated endpoints for push.

Category: Management