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Least connections balancing suits workloads where

  • A.requests differ greatly in how long they take
  • B.every request takes almost exactly the same time
  • C.there is only one backend behind the balancer
  • D.no health checks are configured on the pool

Answer: A

Round robin would keep sending work to a backend already tied up with a long request. Counting open connections approximates the load each backend is actually carrying. It is a cheap proxy that needs no cooperation from the application itself.

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