Discussion
All of the following are good candidates for spot capacity EXCEPT
Answer: A
Correct answer: the primary database of a payments system
A primary transactional database cannot tolerate being reclaimed with two minutes’ notice, and its state cannot simply be recreated. The other three all share the property spot capacity requires: work that can be interrupted and resumed or retried without loss, whether through checkpointing, a retry queue or replication across a fault-tolerant cluster.
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