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Tools / System Design

What is a Load Balancer?

Load balancer is responsible to distribute user requests (load) among the various back-end systems/nodes in the cluster. Each of these back-end machines runs a copy of your software and hence capable of servicing requests.

Another common responsibility is "health-check" where the load balancer uses the "ping-echo" protocol or exchanges heartbeat messages with all the servers to ensure they are up and running fine.

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