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I was asking the following question during interviewing in a company working on cloud computing, and did not answer well. Any suggestions on how to analyze this question will be greatly appreciate.
Our company has hundreds of millions of users and we expect zero down time in production, explain techniques and programming practices that help improve redundancy and fail-over capabilities for front-end, middle-tier and back-end services including database services.
That’s a pretty broad question. If they expect zero downtime, tell them to forget about it or turn all of their profits over to building redundancy. Now, if they just want “five 9’s, or 99.999% uptime” then we can talk. 🙂
You can usually answer these kinds of questions with the usual canned blather about building a sustainable, automatic, build environment that includes extensive unit testing. Using design patterns like MVC or similar can help with testability. Perform regular security audits. This is much bigger than just a development question, this is a question about network and server architecture, maintaining secondary and tertiary data centers, etc. These kinds of question really give you a chance to make the interviewer feel important.