PROFESSIONAL-CLOUD-DEVOPS-ENGINEER Question #11: Real Exam Question with Answer & Explanation

Question

You need to reduce the cost of virtual machines (VM) for your organization. After reviewing different options, you decide to leverage preemptible VM instances. Which application is suitable for preemptible VMs?

Options

• AA scalable in-memory caching system.
• BThe organization's public-facing website.
• CA distributed, eventually consistent NoSQL database cluster with sufficient quorum.
• DA GPU-accelerated video rendering platform that retrieves and stores videos in a storage bucket.

Explanation

Preemptible VMs can be terminated by Google with 30 seconds notice and have a maximum lifetime of 24 hours, making them suitable only for workloads that are fault-tolerant and can gracefully handle instance loss. A scalable in-memory caching system is designed for horizontal distribution - losing a node causes cache misses and temporary performance degradation, but the application continues to function normally by falling back to the origin data store. It is the most fault-tolerant of the options. Option B (public-facing website) on a single preemptible VM would cause downtime. Option C (NoSQL database) risks quorum loss and data inconsistency. Option D (GPU video rendering) stores to a bucket and is also viable, but a distributed cache explicitly tolerates node loss by design.

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