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Who loadbalances the requests to load balancers?

In a big distributed system, Load balancers get HUGE traffic and are front line of defense

  • what if one of the load balancer is flooded with traffic and others are not, leading to congestion?
  • if this is not the case, it must mean load balancer machines have to be really fast AND the logic in load balancer must be very lightweight.

Which of the above two cases hold?

Hi @Eddie, please share the lesson link. Thanks!