Discussion
Consider the following statements comparing horizontal and vertical scaling.
1. Vertical scaling is limited by the largest available instance.
2. Horizontal scaling requires the workload to be distributable.
3. Horizontal scaling works for any application without change.
Answer: C
The first two are correct. The third is precisely the difficulty, since a stateful monolith cannot simply be run in several copies behind a balancer. The work of making it scale out is largely the work of removing local state.
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