Node.js · Senior · Question 74 of 75

How do you deploy a new version of a Node.js API without dropping requests?

1Stop all instances, then start the new version
✓Correct answer: Rolling update: start new instances, route traffic only after readiness checks pass, then drain old instances with graceful shutdown
3Restart the process with kill -9 and rely on client retries

Explanation

Database migrations must be backward compatible during the rollout, since old and new code run at the same time (expand, then contract).

Further reading

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