Phone screen

I got a Circuit Breaker question, but I wasn’t able to complete the code. It wasn’t one of the questions from the question bank.
The setup was a database with a primary and two secondary replica, and each had its own circuit breaker. After 2 consecutive failed requests,

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游客，您好！
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ch before, so I struggled a bit to make everything work.

I wasn’t able to finish the implementation, so I’m expecting a rejection. Good luck!