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How do you scale the DB for token service across multiple DCs and regions without repeating token ranges? Do the token ranges need to be seeded manually per DC/region to prevent the same range from being reused in more than one DC/region? Does this solution constrain us to using a DB technology like Spanner so there is one consistent data set that spans geographies and is replicated in near real time?

Also do not see an api gateway in front of the lb which could then load balance the distributed services..

For hotels data store images in s3 or any blob storage and metadata in MySQL with ref to s3 as a link and then have cdn pull data from s3 which can be accessed via the user app along with metadata for the hotel. Not sure why cdn is being used as store for images in this design..

For hotels data store images in s3 or any blob storage and metadata in MySQL with ref to s3 as a link and then have cdn pull data from s3 which can be accessed via the user app along with metadata for the hotel. Not sure why cdn is being used as store for images in this design..

Awesome explantation , Please keep Posting more videos.

Can u upload a video of system design on swiggy , zomato etc?

Well explained video

Thanks for the details. Could you clarify few doubts, Is Elastic Cluster stores all the item information or only newly onboarded ones ? Search Service doesn't need to talk with Item Store for collecting all the items ? Can you help me reg the differences btw Item and Inventory data Store ?

Really sad why you didn't receive same number of likes as views:) thank you for teaching such good content for free. I wish I could press the like button 100 times. Great efforts!!

Thanks

Brilliant. How can I write code based on that

why there is a loadbalancer in front of the websocket manager? is only first request is going through the load balancer? is loadbalancer is also communicating to websocket manager to make decision about where to forward the request?

great explanation! thanks a lot

7:45 Checking the DB to avoid a collision isn't a valid solution. That introduces a race condition. If service0 queries and finds nothing, and while it's processing, service1 queries the same token and finds nothing, it will try to create a duplicate.

Please explain why are we using kafka or any messaging queue for group messaging, can't the web socket handler directly call the group service and fetch which all users it needs to send the message to? I mean why do we need kafka here, isn't it same as one to one messaging ?

thanks for the video! we should also talk about how we use semaphores when we access shared resources in a microservice setup.

thanks for the video!

Thank you so much for this wonderful video. I have a question. Isn't the web-socket manager a single point of failure? If it briefly goes down, how will it know the scope of the existing web-socket connections on the handlers?

@23:00

Part of handling users separately was genius I was very much confused while reading any other documentation . Thank you for putting this up together.

Thanks for making this review! I enjoyed it.

Thank you for sharing, I've learnt a lot from you :)

Can anyone how will the Shortner Service or the Token service handle ranges that cannot be represented by any integer types in a language? Do we need to represent numbers in strings here?

Thanks for keeping the explanations simple. I have seen some videos where people just bombard with jargons reducing interest.

Why putting everything in the Kafka, is the Kafka scalable enough to handle that much of load

Does this approach assume that we do not care about idempotency? In this model, if the long to short URL service receives multiple requests of the same long URL, the token service will assign that request to different short URLs.

Great content and well-organized flow in the video. Thanks a lot for creating this video.

why kafka

Thank you for the great content ! It looks like the Token Service is a single point of failure as well. And if we create multiple instances of the Token Service, how do they ensure that each instance provides a unique URL range, and no 2 instances provide overlapping ranges? If the Token Services are supposed to communicate each other before deciding the range for an incoming request, this would again add to overhead and slow down the process. Can someone please share their thoughts on this ?

when a new driver comes online and gets connected to a websocket, how the websocket manager gets to know the fact and how does it update mapping? Is it using internally a HashMap?

If you could advise about graph database specifically how to store binary search tree in database. I assume neo4j or aws neptune could archive that

how will you build optimized short->long url search for such scale ?

Very informative videos

A very complex and interesting system design problem use case has been tried to explain here. Kudos for that. However has feedback the knowledge seems more like learnt system design Vs how actually a Vedio conferencing would work. For example: at the end when you U1 and U2 can dynamically switch from P2P to call server, how would this work if the call is getting recorded. In that case both U1 and U2 have to send packets to call server to allow later saving info to a database.

Really helpful!

Let's say we have scenarios where one url U1, is called from two different users for the first time, and both the request R1 and R2 come at the same time, but being sent to different nodes, since all the server nodes have different range of tokens being given to them, same url will be using two tokens, it can also result in decreasing the amount of tokens we have?

Very nice video. very thorough and provided all the necessary information in very easy to understand way. great work.

this channel is a gold mine 👏

nice content. I am preparing for sde2, will update the results here. ty.

Thank you Karle, you have solved my mysterious about databases that has been going thru my head for many years.

you are amazing! thanks a lot!

Sorry if this sounds basic, but I'm new to system design and still learning. Can you explain why you didn't save which user is linked to which WebSocket handler at 41:35 in the video? You mentioned polling for this info, but where does it come from exactly? Is it from the WebSocket handler itself? By the way, great video! 🙌 I really learned a lot from it and appreciate your work!

Hi Sir , Great Video learnt a lot. I have a question .So when we search an item , does item DB and Elastic Search DB interact ? Little confused with the use of Item DB

Man... the content of your video is truly interesting and is worth to watch. But in 30 minutes you say "OK" about 200 times. I'm trying to focus on WHAT you are saying but my brain is just getting ready for the next "OK" (that I don't want to hear). Is it possible to get a sound engineer, who could remove all the "OK"s from the sound track and reupload the video in that form?

Thanks!

Great Content!!

Awesome video man !! Thank you so much 😍

great energy, honest intention, a beatiful human being. thank you

Thanks!