alt Hacker NewsIt seems like passive is the best option here but can someone explain why one real request must fail? So the load balancer is monitoring for failed requests. If it receives one can it not forward the initial request again?
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cormacrelf • today at 2:05 AM
For GET /, sure, and some mature load balancers can do this. For POST /upload_video, no. You'd have to store all in-flight requests, either in-memory or on disk, in case you need to replay the entire thing with a different backend. Not a very good tradeoff.
Not every request is idempotent and its not known when or why a request has failed. GETs are ok (in theory) but you can't retry a POST without risk of side effects.