Intermediate LevelCloud Computing (AWS/GCP/Azure)
How does GCP Pub/Sub handle real-time event messaging compared to AWS SQS/SNS?
❓ Interview Prompt: Explain GCP Pub/Sub global topics, push vs pull subscriptions, message deduplication, and streaming ingestion.
Google Cloud Pub/Sub is a globally distributed asynchronous messaging service that provides real-time event ingestion and delivery.
Key Distinctions from AWS:
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Unified Service: Unlike AWS which splits messaging into SNS (Pub/Sub) and SQS (Queue), GCP Pub/Sub unifies both in a single service.
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Global Topics: Topics are global resources (not regional). Publishers send to a single global topic endpoint, and GCP routes messages across global data centers automatically.
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Push vs Pull Subscriptions:
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Pull Subscriptions: Client applications poll Pub/Sub for message batches.
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Push Subscriptions: Pub/Sub initiates HTTP POST requests directly to subscriber endpoints.
Code Implementation Example
typescript
import { PubSub } from '@google-cloud/pubsub';
const pubsub = new PubSub();
// Pulling messages from a GCP Pub/Sub subscription
const subscription = pubsub.subscription('order-events-sub');
subscription.on('message', (message) => {
console.log('Received Message:', message.data.toString());
message.ack(); // Acknowledge message processing completion
});💡Pulling and acknowledging messages from GCP Pub/Sub subscription.
🎯 Interview Key Takeaway
GCP Pub/Sub provides a unified global messaging engine supporting both push and pull subscription models.
#GCP Pub/Sub#GCP#Messaging#Pub/Sub#Intermediate
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