System Design: What is Load Balancing?

Load balancing is an important concept that lets applications scale to hundreds of thousands if not millions of users. In this video, I explain to you what load balancing is and why its a super useful concept in maintaining application availability.

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[ahsanrfq]

I think "Security" deserves to be on the list too, since only the load balancer is exposed to the public net.

[nixcutus]

Precisely what i needed to understand this...

[ViTran]

Wow thank you, you're super great at explaining technical concepts.

[suprd]

Just found your channel and I'm really enjoying these bite sized videos for certain topics. It certainly helps a new developer get in touched with industry key terms and concepts.

[azimakhtarshenas]

This is amazing and helped me fully understand what I was puzzled in.

[urunovtimes]

wow really great, detail explained and more improvement

[palvinderbhatia]

Great Explanation :D

Question : Doesn't LB again makes a Single point failure problem??

[shirish]

please provide more detailed video with various type of load balancer

[slimxdaturk]

Great explanation. I'll be setting up a GEO based load balancer :)

[jennwng]

Love the video! Thanks for the great content :)

[beto.aveiga]

When people talk about load balancing, my doubt is always, "What will you do with the state"? How can I "scale" by adding different machines if I need one source of truth for my state? On applications with databases, we can easily replicate many things to serve more traffic. Still, in the end, we will have one super central machine with the DB or multiple DBs, which makes me think of a big issue due to replication. Thanks for the video!

[churka]

Dumb question, but, what if load balancer is overloaded? What makes one load balancer better in terms of handling millions of users compared to two web servers? Are these machines normally resource-intensive?

[AlDumbrava]

Ok new question: So load balancing and horizontal scaling have allowed you to handle increasing traffic. But! If all these requests then hit a separate database server, you still have overload issues no? And if you were to split it up (not sure how (I'm a newbie)), would you not have data integrity issues??

[lastone]

Thanks for the tutorial clearly it helps massively, can we configure 2 load balancers instead of one(so called Active-Passive) in case of one becomes unresponsive?
Note: I'll go and hit the subscribe button

[mrchadz]

how does the load balancer Offload traffic or redirect traffic OFF itself? meaning.. if a request comes into the load balancer, then how does it keep all that traffic from flowing through the load balancer itself? It has to route traffic away from itself. So, how does that work if the load balancer is the main point of entry to the network?

[amir.maimon]

What is the different between a load balancer and a router? Both are used to handle traffic.

[subhasishhalder]

Isin't consistent hashing one of the ways to route the traffic?

[malleshk]

Nice explanation. I have a small question. Is it not that load balancer itself will become bottle neck as all requests will come to it and it has to forward requests? How is this handled?

Is return traffic handled from server to client through load balancer or it goes directly between server and client? If it goes through load balancer is it not a bottle neck?

[egor.okhterov]

Who balances Load Balancer and DNS server?

[pareshdehadray]

Thanks for such informative video. Can one load balancer handle millions of requests? How Facebook, Amazon etc handles the user traffic? Do they have single load balancer? If I am in India and Load balancer is in USA so does it mean my request will go USA Load balancer and then to actual server for processing? Kindly explain.