I loved this design! thanks a lot! I'd like to add one point not covered in the capacity estimation. based on the input, users can add up to 10Mb per paste. 100k per day, deriving in 1000GB per day. I think it's good to mention that we can apply compression (manually or let the db do it) to the text that way we can save up to ~60% of the initial calculation for storage, reducing costs quite a lot
@brijchavda3 жыл бұрын
Couple of things. 1. Using serverless will not give you predictable SLA. 2) Cleanup service need to delete the entry from cache also. else, expired paste will still be accessible. 3.) rather than DKGS , you can use UUID (it takes double size 128bit) but u will not need redis and DKGS
@kartikvaidyanathan12372 жыл бұрын
If you use UUID inside the writepaste lambdas or containers then there is a chance of duplication as there are multiple instances. I don’t think that will work well.
@rabindrapatra7151 Жыл бұрын
@@kartikvaidyanathan1237 A collision is when the same UUID is generated more than one time and is assigned to different objects. Even though it is possible, the 128-bit value is extremely unlikely to be repeated by any other UUID. The possibility is close enough to zero, for all practical purposes, that it is negligible.
@TheCosmique11 Жыл бұрын
@@rabindrapatra7151 yes but what is stopping from multiple lambdas from generating the same UUID. I understand if the Id gen service is centralised and UUID comes from there. But my understanding is each lambda internally generates a UUID
@nishanth182811 ай бұрын
Cleanup service need to delete the entry from cache also. else, expired paste will still be accessible -> Can't we add into cache with TTL. That should automatically solve the issue
@taniksusu40344 ай бұрын
@@TheCosmique11 Acc to wikipedia - the number of random version-4 UUIDs which need to be generated in order to have a 50% probability of at least one collision is 2.71 quintillion. en.wikipedia.org/wiki/Universally_unique_identifier#Random_UUID_probability_of_duplicates:~:text=22%5D%5B23%5D-,Collisions,-%5Bedit%5D
@triv9843 жыл бұрын
Thanks Narian for great videos! I have a question regarding DKGS. Isn't it an overhead? I mean that key generation formula (timestamp+nodeid+counter) seems to be already enough to cover uniqueness requirement. And even if there will be collision -- is it still worse to call DKGS service instead of DB directly? Thanks!
@random667874 жыл бұрын
Hi Narain. Great video. However, there seems to be a mistake at 3:26 in the estimation part. 100k/(24*3600) = ~1.5 not 1.5k writes/sec.
@TechDummiesNarendraL4 жыл бұрын
Feels stupid, why did I make that mistake😁
@UntamedRogueMavrick3 жыл бұрын
@@TechDummiesNarendraL You are doing thousands of smart things. No prob!!!
@IC-kf4mz3 жыл бұрын
Your comment confused me further. You said "not 1.5k writes/sec" but in video he said "150 writes/sec". Did you mean it should be 1.5 writes/sec and not 150 writes/sec?
@IC-kf4mz3 жыл бұрын
Also to note, here "per hour" and "per second" is not really used in the design later on.
@umangmalhotra12223 жыл бұрын
@@IC-kf4mz Yes, it should be 1.5 writes every second.
@pubamx3 жыл бұрын
Hi Naren, this is one of the greatest system design overviews for this particular problem. A good approach in both LLD and HLG well justified and explained each trade-offs of the implementation. Thank youl
@mauvezebra2 жыл бұрын
Hi Narendra. I listened to your system design videos and practised. Now I got the job I was trying to get. Thank you so much!
@parthsharma82693 жыл бұрын
If anyone is thinking how 64 comes up at 20:40, that is because [A-Z,a-z,0-9] sums up to [26+26+20]=62 and special characters like '+' and '/' adds up to 64, Base64 encoding
@MultiPriya284 жыл бұрын
Please make a video on github design! :)
@rohangarg54734 жыл бұрын
yes make a video on this.
@ankurkumarraj4 жыл бұрын
yes Tech Dummies please make a video on this.
@designvoodoo3 жыл бұрын
I would love to watch this!
@tradestar92662 жыл бұрын
Bro Can you make video of ZERODHA KITE system design
@GauravJain1083 жыл бұрын
Really cool idea to show the preview of 100KB while fetching data from S3.
@AlucardHV4 жыл бұрын
Very good approach. Thank you. Wish me luck in my systems design interview today!
@willinton064 жыл бұрын
Whenever I get a job I'm definetly joining your channel
@totolipton4 жыл бұрын
Hi I think the paste table needs a 'usr_id' field so you can find out who created the paste.
@JoshMadakor2 жыл бұрын
This is good. Thank you :)
@2devanshi4 жыл бұрын
Please try to include Food delivery system( real time tracking, multiple different apps for each types of user(buyer/delivery/hotel), synch between apps, sending device info when app is web based/sdk based etc) and ecommerce site( like best practices for big billion day with less latency(how we can optimize locking), Order management services - where millions of customers wants to view order in real time, order tracking, canceling order and similar kinds of design challenges in such systems)
@indiansoftwareengineer48994 жыл бұрын
Yeah, please make video on Swiggy or zomatos system design video.
@outofbody47882 жыл бұрын
lol - in other words "please design my business idea"
@akashdarji71312 жыл бұрын
hey bro if you have time can you make video on Brave Browser Blockchain based - System design, architecture. thanks
@tradestar92662 жыл бұрын
Bro Can you make video of ZERODHA KITE system design
@tradestar92662 жыл бұрын
Bro Can you make video of ZERODHA KITE system design
@tradestar92662 жыл бұрын
Bro Can you make video of ZERODHA KITE system design
@tradestar92662 жыл бұрын
Bro Can you make video of ZERODHA KITE system design
@cornorange76224 жыл бұрын
just want you know your videos are great, appreciate your efforts!
@anshulgolu1234 жыл бұрын
Your video is great !! Had one small doubt though below: How do you explain how can 10 character key be used to generate 100GB? Ideally total storage for 10 characters can be (62^10) * 10 bytes [assuming a character takes 1 byte] which is a lot more than 100GB If we assume we are using 5 character key we will get (62^5)*5 bytes which is approx 34GB
@iancarbaugh40813 жыл бұрын
Thank you, Narendra, for your exceptional content! I learned a lot from you.
@rahulsharma50303 жыл бұрын
hey, thanks for tutorial.This channel is really awesome. I have a doubts:- 1.When you are mentioning data base comparision @13:00(approx). Why did you choose partitioning in RDMS.I think partitioning would be easy in NO SQL world as some db provide inbuild solution for this and RDMS is often easy to scale veritcally instead horizontally. Isnt it better to have NOSQL if we want to scale later? 2.And if we use partitioning .the way u mentioned that if one db is filled ,we will go other. Shouldnt we be using consistent hashing in this case instead of one range filled, go to other. Range based partitioning has multiple db nodes running parallel each handling different data. Please let me know you thoughts
@SakshiJain-bq6gc4 ай бұрын
Thanks Narendra for great videos. I see you corrected the Traffic estimation. Shouldn't it also change the storage estimation?
@rbragdish3 жыл бұрын
Hands down the best channel I've found for system design. Kudos bro!
@venkateswarank11454 жыл бұрын
Happy happieee birthday champ 😉 Your dedication of posting video even on your bday is just amazing. Looking forward to learn more from you 😊
@TechDummiesNarendraL4 жыл бұрын
Thanks :)
@jh07204 жыл бұрын
(64^10)*10 ≈ 1e+19, so shouldn't this be more like 10000000 TB and not 100 GB?
@mykytapiskarov72918 ай бұрын
Thanks Narendra! I learned lots of great ideas from you! One question, there's can be race condition when two write APIs will get same key from DKGS. How can we prevent such race condition?
@shahanakhan82993 жыл бұрын
The traffic estimates for writes is incorrect. 100K/(24*3600) = 1.1 pastes/sec . Am I missing something here?
@IC-kf4mz3 жыл бұрын
1. Is schema important to discuss in System Design in detail? 2. If serverless, in URL Shortner also can we use serverless? 3. Why do we use memcached and not redis, just cost? High performance and cost? 4. Is Zookeeper a DKGS?
@YashJain942 жыл бұрын
Paste schema needs to also have user_id and user schema needs to have a list of all pastes created to fulfill the functional requirements
@deveshranjan62043 ай бұрын
Why have you used serverless for this problem, it will cost more than using a full server for the problem
@nayannandi35963 жыл бұрын
Sir make a video on charting website like tradingview system design.....
@大盗江南4 жыл бұрын
This is super good bro...Great Thx for ur great work! Could u do a video about calculating those normally seen volumnes, eg, 1 video takes how much bytes etc. Thx :D
@imasomebody1Ай бұрын
like the video thanks for sharing. But i think the math is wrong for cap estimation. 100K / 24 / 3600 is not 150 writes per second - it's 1.15 - not sure if anyone else caught that - and the video is 4 years old. i didn't scan all the comments
@arupde63202 жыл бұрын
r u alive ??
@DeepakKumar-yl3ok Жыл бұрын
100 k requested per day, mount to approximately 1.15 requests per second => 100 * 1000 / 24 * 60 * 60 = 1.15 , how are you saying 150 req / sec?
@shreyas231002523 жыл бұрын
Hey narendra, what shouldbe the initial approach on any system design. Ex: I can we have split the requirement into functional requirement and non functional. Also what are videos which we need to go thru first to get the fundamentals and to full scale design. Any recommendation on materials to understand the basic module of SD.
@nayannandi35963 жыл бұрын
Make a video on tradingview system design....
@Yash-cg6if Жыл бұрын
Hi sir, i have one question. I am new to all this i am 12th passout so it might be dumb question for you but please reply the answer. if pastebin gets expired how to delete it from database either scan database daily for which text has expired and remove it or any other technique which one is best, optimized,etc. and if we bin gets expired after 10 mins, 1hr,etc. then how to implement how to do it?
@janezhou4641 Жыл бұрын
When key is expired, should we clear MemCache as well? Or it will be automatically cleared once DB is cleared. Thanks.
@kartikvaidyanathan12372 жыл бұрын
Does memcache support replication? I guess not and it isn’t great for distributed systems. I would like to know more why memcache is a better choice here than redis.
@vimalkumarsinghal4 жыл бұрын
Hi Naren, your channel is full of resource ..thanks for sharing. Can you have one video on designing dashboard for efficient data centers monitoring using data model.
@unujjwalАй бұрын
Boss 4166/3600 is 1.15 not 150, so wrong capacity estimation
@vijitail19794 жыл бұрын
Great explanation!!
@munnykumar62484 жыл бұрын
Please, describe socket connection in a distributed system/multi-server system
@saurabhmittal69473 ай бұрын
aren't the initial back of envelope calculations wrong ?
@dheerendrakaibartta663 Жыл бұрын
good video sir
@saikatislam40062 жыл бұрын
Why no video?? Have you left earth during covid??
@michellemendonca56232 ай бұрын
very didactic, congratulations!
@Lima3578user Жыл бұрын
Can you please upload the basics of systems design
@desiguy55082 жыл бұрын
Why are we using SQL for storing data here?
@devarpi911 Жыл бұрын
For keys can't we use UUID V4?
@tradestar92662 жыл бұрын
Bro Can you make video of ZERODHA KITE system design
@umangmalhotra12223 жыл бұрын
12:30 , isn't 65 KB Max row size in DBs like MYSQL? How are we going to store 100 KB data then in content field ?
@jayeshsolanki10324 жыл бұрын
Hey Naren, where are you these days?? I really miss your videos on SAD. Please come back..
@piyusgupta94984 жыл бұрын
Excellent explanation Narendra, Wish you a very happy birthday dear !!!
@TechDummiesNarendraL4 жыл бұрын
Thank you so much 🙂
@Rockersvirtue4 жыл бұрын
Great video. Thanks for your effort. One doubt though, How to allow custom string provided by user? I understand that we can store mapping between key and custom string for each user. However, how to do for anonymous user? Wouldn't we be overwriting the paste or exposing name of paste in such case?
@shashankmishra4842 жыл бұрын
How is "User can decide on the pastebin link" solved? Here it seems that the user can keep on trying for a unique ID, of length 10 as constrained, and keep on hitting on the already used ones, leading to going to and fro until he finds a unique key? Does the snowflake generator or just a normal key generator help with this?
@anusree1143 жыл бұрын
Naren , you stopped making videos ?? Ohh ohh you might be busy on new job, but.......... we want you back.
@jh07204 жыл бұрын
Your videos keeping getting better
@PRAXYBEATS Жыл бұрын
why cant we use uuid?
@winitan2 жыл бұрын
Why couldn't zookeeper be used to generate unique id's in this case also just like in URL shortener video instead of KGS?
@dpynsnyl Жыл бұрын
This is grade A stuff!
@Eremtek3 жыл бұрын
Thanks for the explanation! In the async clean-up step, should we also clear the value in the mem cache? For long texts, we'd end up with a preview (from the cache) but when it tries to fetch the full text from the DB it'll error out?
@RajChithathur3 жыл бұрын
Mostly we will cache the data with some expiry dates time like 2 days or 7 days something like that, so it will automatically expiry automatically
@sreemanth4 жыл бұрын
Key generation service , can we use bloomfilter to reduces size of redis memory size?
@TechDummiesNarendraL4 жыл бұрын
Yes
@eeyore3454 жыл бұрын
@@TechDummiesNarendraL Hmm .. bloom filter may return true when it's not, wouldn't it? I suppose since we have quite a few IDs to spare in this case, that could do. :)
@aditigupta68706 ай бұрын
Hi, good explanation, but why there is no linking attribute between User and Paste tables
@aditigupta68706 ай бұрын
Shouldnt a CreatedBy field be there in Paste table referring to User table
@ghanshyam0144 жыл бұрын
Happy birthday 🎂 Dear bhaiya😘 Wishing you a very happy and prosperous birthday with full of love, joy and happiness...🌷🌺🏵️🌸💐 ..... ..... It's belated but yeah.....🥰 🌸🌿 Stay blessed , safe and protected always ❣️🌿🌸
@rahulsharma50303 жыл бұрын
@29, if we know algo to generate keys, like time stamp+node_id+counter. Then why cant write service generate on its own?It will take almost ineligible time
@arunavamukherjee20872 жыл бұрын
Hi Narendra, May be I missed something, but why we cant store everything in S3 and use a Geo specific CDN around that to get the data very fast? in that case we dont need the actual data in DB.
@subee1282 ай бұрын
thanks
@PRADIP2010PATEL2 жыл бұрын
Thanks! I think cleanup service has to delete record from MemCache if record present in cache.
@flavius296633 жыл бұрын
Hi, very nice video. Why are you saying that memcached is faster than redis for this usage pattern? Are there some benchmarks or white papers? Or what are you basing this assumption on?
@KazmirTubecom-qd3pr4 жыл бұрын
Can you share us the system design for Paytm? Please do this video. I NEED IT! PAYTM!
@permshivsingh52153 жыл бұрын
Hi Narain if we are using twiiter snowflake to generate unique IDs and generate hashvalue from IDs using base 62 conversation then there is no chance of collisions. So I think we don't need KGS service . Write service can handle the key generation part and no need to check db if key exist or not as keys are always unique. What do you think ?
@jp-uo7bz4 жыл бұрын
Why were both redis and memcached used? Wouldn't either solve the job?
@manojgowdak67353 жыл бұрын
Hi bro I am manoj
@kumark75052 жыл бұрын
Hi Narain, good video and explanation. Question on S3 Blob retrieval! Do you share the blob link to client and client downloads content? In this case, how authentication to S3 happens? Or Webserver behind the gateway retrieves the content from s3 by authentication and then send the downloaded data to client?.
@ADG10252 жыл бұрын
Thanks for the video. What about adding a CDN between the end user and read request? This would cache and offload all large portion of the read requests from ever hitting the API. Only a small percentage of pages would need to hit the origin. You could introduce a queue for expiring cached pages upon edit or deletion.
@jrwang5373 жыл бұрын
Do you still make videos in this channel?
@meghadave93636 ай бұрын
hi. some really important points for decision making. thanks
@AModernCTO4 жыл бұрын
How much cost you to add English subtitles in your videos or even Portuguese? It an awesome subject that should be available for more people to enjoy it.
@elproferiveraoficial3 жыл бұрын
his english is very understable and if you are in a real interview they won't show you subtitles.
@AModernCTO3 жыл бұрын
It's not about real interview. It's about making his content available to everybody.
@elproferiveraoficial3 жыл бұрын
@@AModernCTO the video already has CC.
@altugaecoffice2 жыл бұрын
Hi Naren, great content as always. I noticed u have not posted since last year. Are you going to put any more great videos as u used to or r u taking a break?
@AkshayTaletiya3 жыл бұрын
I have a suggestion/question - could we not create GUID instead of using DKGS
@hs20753 жыл бұрын
Can't we use Range based approach with Zookeeper as u explained in urlShortner design video to generate the keys?
@RajeshKumar-nd5ud2 жыл бұрын
Great Job👍 Waiting for Token based authentication system design.
@designvoodoo3 жыл бұрын
Can you please make a video about Notion? I'm working on my final year project at university, measuring the impact of various software on the planet - your videos are so helpful! Thank you
@bhavyabansal11432 жыл бұрын
for unique keys, can't we use same zookeeper process as we used in the url shortening design?
@pinyichang46802 жыл бұрын
HI
@screen1893 жыл бұрын
Hi Narendra - Thanks for making these system design videos. Its useful for all engineers irrespective of whether they are interviewing or not. Please make a detailed video on following topics - a) System design for Heatmap. Let's say Heatmap of Uber drivers. b) Zookeeper functionality c) DevOps best practices or DevOps series.
@prernachauhan62624 жыл бұрын
I did not understand the 64^10 part? I understand that we have 64 bit(8 character) unique Id, that can be used in our URL right? How are we generating 10 character url with 64 possibilities at each character?
@pandalove53743 жыл бұрын
Thank you so much for uploading great content. Can you please explain what happen to local counter when it recover from a failure? will be it reset to initial value?
@abcd122724 жыл бұрын
Do we really need to keep track of used token ranges? Threads in the key generation service will always increment and return anyways, question of providing used keys will never arise
@mohammadkaif81432 жыл бұрын
One small correction, there would be userId field in the paste table.(13:48)
@irvinge46413 жыл бұрын
shouldnt the cleanup service also cleanup the used keys in Redis?
@unboxhdtech21852 жыл бұрын
Let's see how many legends will watch this incredible video to the end🧡
@wanmingtom4 жыл бұрын
Is it really nessasary to build a service only for generating unique key?
@Ramchandra-fp2ty3 жыл бұрын
Hi Narendra, can you please discuss the feature of sharing the paste with other users and discuss it at scale and how to handle it
@elfchosen14773 жыл бұрын
I am wondering why blob storage read does not have cached?