Systems Analyst: What is the difference between pull-based and push-based scaling?

Pull-Based — metrics trigger scaling. Push-Based — events trigger scaling.

Pull-Based Scaling:

• Monitor metrics.
• Trigger on threshold.
• Reactive.
• CPU, memory based.

Push-Based Scaling:

• Event triggers scaling.
• Proactive.
• Queue length based.
• Predictive.

Key differences:

• Pull — metrics.
• Push — events.
• Pull — reactive.
• Push — proactive.