Will the Guru

Push model is a model that broker pushes the message to the consumer, while pull model is a model that consumer pulls the message from the broker whenever consumer wants.

Pros and Cons

Push model

• Pros
  • Optimized for latency
  • Client(Consumer) is lightweight. Broker handles most of the burden
  • Load balancing among competing consumers

• Cons
  • Flow control
    • Control the speed of message push so that consumers don’t get overwhelmed
  • Broker logic is complex
• ex)
  • RabbitMQ, ActiveMQ

Pull model

• Pros
  • Optimized for throughput
  • Better suited for message replay
    • Consumer can send the offset they want to pull from to the broker
• Cons
  • Polling in a tight loop
  • Client(Consumer) logic is complex
• ex)
  • Kafka, SQS

Reference

• https://leetcode.com/explore/interview/card/system-design-for-interviews-and-beyond/728/how-to-build-efficient-communication-in-distribute/4776/