Challenges of Pub/Sub Architecture
- Message Ordering: Pub/Sub systems typically do not guarantee the order in which messages are delivered to subscribers. This can be a challenge for applications that require strict message ordering, as subscribers may receive messages out of order.
- Exactly-once Message Delivery: Ensuring exactly-once message delivery can be challenging in Pub/Sub systems, especially in the presence of failures or network issues. Implementing mechanisms to guarantee exactly-once delivery without introducing duplicates can be complex.
- Latency: Pub/Sub systems introduce latency due to the message routing and delivery process. Minimizing latency while maintaining scalability and reliability can be challenging, especially in real-time applications where low latency is critical.
- Complexity: Implementing a Pub/Sub architecture can introduce complexity, especially in large-scale deployments. Managing subscriptions, message routing, and ensuring consistency across distributed components require careful design and management.
- Security: Securing Pub/Sub systems against unauthorized access, data breaches, and message tampering requires implementing robust authentication, authorization, and encryption mechanisms.
What is Pub/Sub Architecture?
Consider a scenario of synchronous message passing. You have two components in your system that communicate with each other. Let’s call the sender and receiver. The receiver asks for a service from the sender and the sender serves the request and waits for an acknowledgment from the receiver.
- There is another receiver that requests a service from the sender. The sender is blocked since it hasn’t yet received any acknowledgment from the first receiver.
- The sender isn’t able to serve the second receiver which can create problems. To solve this drawback, the Pub-Sub model was introduced.
Important Topics for the Pub/Sub Architecture
- What is Pub/Sub Architecture?
- Components of Pub/Sub Architecture?
- How does Pub/Sub Architecture work?
- Real-World Example of Pub/Sub Architecture
- Use-cases of Pub/Sub Architecture
- When to Use the Pub/Sub Architecture
- When Not to Use the Pub/Sub Architecture
- How Scalable and Secure is Pub/Sub Architecture?
- Benefits of Pub/Sub Architecture
- Challenges of Pub/Sub Architecture
- Pub/Sub Vs. Point to Point Messaging