Ec2 Compute Engine

Hook

A virtual machine contributes a finite processing budget; adding machines does not repair every downstream failure.

Watch

Choose AWS or GCP mapping, change one validated model parameter and load the trace. Provider labels identify concepts; the model never provisions resources or calls a provider account.

How it works

Adjust app replicas and per-replica CPU work capacity. Requests enter the app pool, then the separately limited database; queues, rejected requests and completions are all accounted for. The AWS/GCP toggle changes component mappings, not a universal hardware performance claim.

AWS and GCP comparison

AWS: EC2 / Compute Engine virtual machines. GCP: EC2 / Compute Engine virtual machines. EC2 and Compute Engine expose different instance families, images, disks and billing choices. The model uses assumed work units, not measured vCPU throughput or current pricing. OS patching, image policy, IAM and network configuration remain part of VM operation.

Try it

Overload one replica, add CPU or replicas, then fail the database. Explain why application scaling stops helping once the shared dependency is the bottleneck. Predict the next modeled decision before advancing.

Complexity

Use the displayed measured operation and explicit bounds. Simulator operations, service quotas, network latency and cloud billing are different measurements. Validate production capacity using the selected product and workload.

Code

The four references implement the core local state model. Provider annotations and UI controls surround that model; the snippets do not authenticate, provision resources or replace a vendor SDK. Worked saga references assume reliable local compensation.

When to use

Use the scenario to explain access patterns, ownership, failure policy and the operational assumptions behind a cloud service choice.

Interview pitfalls

EC2 and Compute Engine expose different instance families, images, disks and billing choices. The model uses assumed work units, not measured vCPU throughput or current pricing. OS patching, image policy, IAM and network configuration remain part of VM operation.

Quiz

Explain one concrete outcome, one provider distinction and one unmodeled production concern.