Key takeaways : 1. Web sockets must be used for such application as the communication is real time and lot of to-fro communication happens between client-server for which web sockets work the best 2. the location update happens asynchronously using a queuing system like KAFKA , as this is a write heavy operation . 3. Each location would map to a grid id on a 2D matrix and the location service would use the nearby cells on grid to fetch the drivers in vicinity. 4. The APP servers are stored in a Ring (based on consistent hashing) and each APP server caters to different set of cells of the Grid. Each node knows about each other through config publishing mechanism and any call to any server would be redirected to the correct node

This question was asked for me 15000 per month job as a fresher🙂

Binge watching the system design videos on this channel. This is pure gold and free on youtube for everyone to watch! Thanks a lot Narendra. You clearly put in a lot of effort making these videos.

I really appreciate the amount of effort you have put for this system design talk. Thanks for sharing such valuable information in a short time span.

Few suggestions : 1. Websocket is being shown as an API Gateway which is incorrect. 2. Websocket comes with its own complications like failure on firewalls. 3. In system design, we don't focus much on the implementation logic. Good that you explained concept of cell but that's not a very important piece. Thats more of a low level implementation. 4. Support for NodeJs is partially correct. Java or C# can scale better than NodeJs in a multi threaded environment. Though Nodejs is fast to develop and deploy. But when threading comes there are better alternatives. 5. Discussions should be more focussed around DB and type of DB choices with reasons.

I saw you saying sorry, Boss you are a genius and selfless person. Never say sorry again. I get reminded of mistakes and never said a sorry. Great work!! and Thanks for making me love my job .

Appreciate you taking stuff from real engineering blogs, instead of discussing a hypothetical design. Thanks for the effort!

Great content, laid out in a concise manner, appreciate the effort you put into making these systems design video series, keep it up. Cheers.

Currently watching every single system design video created by you..super useful and fun to watch! Keep'em coming..

This is gold, I'm looking forward to how tech enables ground ops for mainstream products.

this is gold, and the efforts and your persistence is beyond praiseworthy

Great content and lot of work Naren! Sincerely appreciate it. One thing I would like to suggest that we should call out how region servers are formed at the beginning and how the division and distribution of spherical earth is done across region servers shown in DISCO as part of the ring.

Hey man ! Very useful and nicely presented. I've started loving all your videos and have literally binge watched 'em all. In this video, I was also expecting you to cover up how Uber matches the pool rides .. basically a map route matching algorithm.. if you could brief on that, it would be very useful ! Thank you and wishing you huge success ahead !

Respect dude ... You perfectly explained the Complex architecture. You mentioned right about the Data Backup smartly placed during operation failure in main Data Center. Kudos for your effort. Wish to see more from you :)

Great explanation man. The extent to which you went on to explain stuff.

Just amazing, I never saw this kind of clear explanation about the system design. Keep it up

I have gone through many Design Explanation Video but I must say that This is the Best Uber Explanation Video I ever have seen.

Thank you so much for such an in-depth, but understandable explanation!

Hi Narendra, Thanks a ton. I could understand the system design better and could get the job offer from the knowledge I got from this series. Thank you not only because of the help you did by posting all the videos on system design but also for helping me by answering my queries personally on the LinkedIn. I kept on browsing the youtube to find out some quality content, but here is the home of understanding almost all types of designs questions.

Thank you so much for such a super useful video, good explaination.keep up the good work.

I'm using Uber for my Data collection Map assignment. You're video is very helpful! Keep up the good work.

One of the most important videos i have watched. It's simple and informative. I'll definitely check out the other videos.

Thanks bro, for the information, I was actually thinking how can I imporve my mapping algorithm, your video is worth watching keep making such great content.

This is so good! Insane amount of details. Thanks a ton for this.

Cleared a interview with your system design approach , keep making videos

Good stuff, I was working on a prototype before but now it means there is more to it

It's just been a while since I opened the channel. Thanks to the good video, I learn a lot. Thank you. I will always support you.

Thanks a lot for this video. Everything is explained well in detail and the video is very easy to follow. I watched it casually and gained so much knowledge :)

Great job man ... Appreciate the efforts

Great content. I loved the clear explanation. This is going to be one of my favorite channels.

Narendra, hats off to you! Your architecture presentations are world class. Your presentation and organization of material is excellent. Thanks very much for your great service!

Hi Narain, you put in great effort in explaining the system. Your videos are amazing to learn architectures.

This video was just amazing bro . Got to learn about the depth of this huge complex system with ease. Thanks a lot.

Keep posting valuable content on system design. Awesome This approach to system design interviews says that we have a preconception about how things should be. I have a suggestion, please show the approach from bottom up, i.e from scratch. The video starts with a full fledged version of a system already designed. How would anybody come up with such a detailed design at the beginning of the interview.

Huge .. this was huge , incredible and simple at the same time. Keep going !!👍👍

Amazing work Mr Naren.

I think U are 1st who providing confidential knowledge ....openly. Thanks I appreciate U.

Great video. Thanks for including links to your references. They are fascinating reads.

subscribing to your channel to help you grow bro @techDummies . Unlike other tutorial videos, its clearly visible that you have done lot of work/effort to really learn the design yourself and teach your viewers.Cheers to you

Damn, you are just so awesome. You will definitely definitely earn more and more subscribers, just like how Gaurav Sen did. You guys are what every developer on youtube needs. Thanks for the initiative! :)

Really amazing, this system design is really great to handle Taxi Booking app Thanks for share a knowledge!

Complete architecture is very well explained. Good work buddy!

Very well explained and the clarity is so good. Thanks very much.

Thanks a lot..This is so complicated..wow..

Wow... amazing video and great effort in explaining all the concepts of a ride sharing system. Really gave me a new insight! 👍🏻 Thanks for sharing!! 😁

Awesome explanation .. thanks a ton for sharing this. Explanation is so wonderfully done and so detailed... Highly appreciate the content you are publishing. You got another Subscriber :)

Always had an interest about this system how it works. You explained it very simple way. Great presentation.

Really appreciate. Very knowledgeable video. Thanks for it. Keep doing such good work

Hi Narendra, awesome explanation. Highly motivated in learning system design. Though, I have a question, Can you please make a video on how to efficiently make a search service that searches on billions of records.

Saw this video in 2018 and it looked so tough , coming back here with some knowledge it makes it look somewhat understandable like 60% I can grasp just by watching this video so please you younger lads and ladies don't get disheartened if you don't get it on the first try .

Thanks a lot!! The way you put details into context is comendable

Fantastic , so many great concepts and very well organized presentation. I look forward to watching your other videos.

Wow what an explanation I'm searching for this kind of information from 4 days luckily I got it thank you so much

Great work man. Very nice explanation. It definitely takes a lot of effort to put it together. Thanks for sharing.

We need more of this. Awesome content bro (y)

Very helpful video, thank for sharing. Let's continue with another system design architecture ^^

Narendra, thanks for your insights on system design. It was one of the key sources that I referred and it really helped to get an SDM role with Amazon. Thanks a TON

This is great .. thanks a ton for sharing this so wonderfully and detailed. Highly appreciated .. Thank you so much.

Thanks for a wonderful explanation on the system design.

Detailed explanation! Awesome. Also LP t-shirt!

brain storming , I liked the way you narrated design. I felt not required to street on analytics vs have use cases explained for entire request cycle Great JoB

Thank you for the clear and detailed description. Great effort 👏🏻

Great explanation and consolidation of topics in engineering.uber ...it would have taken me days just to put all the bits together and understand the design ...thanks for the effort..

Excellent explanation of all microservices.Superb job

Great video - you have explained some key concepts of the whole architecture wonderfully! Thank you so much for this! I have one question though, I couldn't fully understand how the Backup Data Center enables the whole trip with the State Digest stored in the driver/rider's cell phone - what exactly happens in the backup center ?

Beautifully done with explaination...as network security guy It was so clear to me

Nicely presented. Precise, articulate, and well structured.

Great content. Explanation was quite elaborative and very detailed. Kafka streaming was also quite clear and easy to understand the entire design.

Thank you so much for the useful explanation.

perfect broo! you really amaze me! waiting for Instagram system design :D liked and subscribed :D

Amazing details about the design. You must have spent hours reading uber blogs and collecting information. Initially I was lazy to watch 36 mins of the video but eventually I saw the whole video.

I really liked the coverage you did here... Few things which could be add-on - How does payment system work here? - Sharing live location to others like with family or friends

Thanks for the video. Excellent content!!

I spent 11000 for educative.io for System design but watching your vidoes. Thanks a ton for your help to community.

Great work, I enjoyed this, keep covering more designs.

U made it look so simple..Thanks a lot..You've got a subscriber

Good job. Thank you for taking the pain to explain so much in a clear language.

Thanks brother. Excellent presentation. U r gracing us with it knowledge

Mouthful of information...Thanks for sharing the knowledge...it helped me a lot...Keep sharing more videos like this.

Very good and please continue the way how explain. Awesome

Super and highly recommended.Keep it up bro.

Love your videos but a couple of main things missing in most of your videos that is highly desirable in job interviews is: DB schema and basic API. These two components might add another 4-5 minutes to every video but will make these videos almost an exhaustive study of the design.

Great explanation. Was just wondering if there is any relationship between the S2 library and uber hex spatial indexing when dispatching.

Just a quick correction, DNS is part of the Application Layer in the OSI model. On that note, it is actually part of Layer 7

Thanks for breaking it down and taking time to make a video!

Great explanation for a very complex system. Congratulations!

Thanks so much for this video, it is really valuable.

Dude, this video is awesome. Thank you very much for sharing !

Great overview. Thanks for the sharing.

Thank you very much brother...was searching these kind of explantnations.. Subscribed.

bro awesome explanation... keep up bro your good work.

Great video! such a good explanation, thanks for sharing.

Thanks Narendra, this vlog was very helpful and thanks for your time and effort.

Thank you for the great explanation!

Priceless content ! Many thanks bro !

Superb...! Thanks you so much for the video.

Awesome explanation... Thank You 😊

Really useful for interviewing. Thank you :) :) :)

Awesome video ! Please help me with below two questions. 1. Driver location is updated to nodes in hashring depending on s2 cell. Since car is in motion location and s2 cell will keep on changing. Suppose location is store on server s-1 which handles cell c-1 and now driver has entered cell 2 and location is updated to c-2 which is store on server s-2. How would server s-1 know that driver has moved out of cell c-1 to remove driver from it ? 2. Is driver location stored on cache for each server or there is cache cluster which stores location information.