Explain load balancer and its algorithms.

[bob]

You see servers buckling under heavy traffic all the time. I hit that wall early in my career and it stung. Load balancers step in to spread requests across multiple machines without letting any one choke. You watch the traffic get tossed around like hot potatoes so nothing piles up too much. And it keeps everything humming even when spikes hit hard.
But algorithms decide exactly how that spreading happens in practice. Round robin cycles requests one server after another in a steady loop. You might notice it works fine for equal machines but falls short when loads differ wildly. Least connections checks which box carries fewer active sessions right now. Or it shifts the next request there to avoid overload on busy ones. I prefer this when sessions drag on longer than expected.
Weighted versions let you assign bigger shares to stronger hardware. You tweak those numbers based on CPU power or memory size. Source based hashing sticks a client to the same server using its address. And that preserves session data without extra tricks. Perhaps you combine methods when simple cycling fails under mixed traffic.
Now dynamic approaches monitor real time metrics like response times. I tweak them often because static rules ignore sudden changes. You see algorithms adapt by pulling health checks first. But some ignore latency until errors pile up. Or they factor in bandwidth usage to reroute flows smoothly.
Algorithms also handle sticky sessions for apps needing state. You avoid breaking user flows that way during switches. I recall setups where hashing prevented logouts after redirects. Perhaps random selection adds unpredictability for basic balancing needs. And it surprises you with even distribution sometimes despite seeming crude.
You blend these ideas when scaling clusters grow complex. Load balancers sit in front like traffic cops directing cars. I test them in labs before live deployments hit. Or you simulate failures to see failover kick in fast. Algorithms evolve with your setup so monitoring stays key.
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