Meta Interview Question | System Design: Privacy & Visibility Controls (5+ Approaches)

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System design (HLD) for privacy & visibility filters by a FAANG Senior Engineer that has reviewed over 100 design documents. 📚
This video will cover the complete high-level design and data flow diagrams for the software architecture entailed by this common system design interview question.
NOTES & CORRECTIONS:
- excalidraw file: excalidraw.com/#json=5TVSlX_P...
- screenshots of the excalidraw file: imgur.com/a/gTqc6nb
- text file: pastebin.com/Vcpa72WA

Опубликовано:

17 ноя 2023

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Комментарии : 14

@SDFC 8 месяцев назад

NOTES & CORRECTIONS: - excalidraw file: excalidraw.com/#json=5TVSlX_P75sYx_qGuIvYt,SPEcBaIUi89CYGM7PLKzcA - text file: pastebin.com/Vcpa72WA

@user-gz6ml8ts3f 8 месяцев назад

absolutely nothing less than great. First view and this is gold.

@igorrybalka2611 6 месяцев назад

Thanks for the video! Can you please explain why we're using one record in DynamoDB per every relation? Why not use native e.g. NumberSet datatype and store all friends of a particular user in this set in a single entry? What's the downside?

@koeber99 5 месяцев назад

Yeah, I have this questioned as well!!! I think table would be: UserID:Yuoi123, BirthDay:01/01/10 Birthday_Visibility: { only_Me, friends, custom_group#1, friends-of-friends } Education: "School_Name" Education_Visibility: { only_Me, Friends }

@Summer-qs7rq 6 месяцев назад

how does a db trigger work in multi-mater or more over when we do replication ? will we have multiple db triggers ? so do we need any idempotency key

@juhairahamed5342 8 месяцев назад

In newsfeed database is i.e necessary we can store post content .. instead of just store the postid is enough. Pls Reply Thanks

@laughingcolors 7 месяцев назад

Please please please increase font size for all the text. It is very hard to follow. I understand things don't fit in screen but we usually have website for tthat

@SDFC 7 месяцев назад

what timestamp? I actually decrease my screen resolution to mimic a phone’s resolution AND crank up sublime text font size by 6 notches you might need to increase the resolution in your settings - I sometimes have seen only 360p or 480p by default, but I’m _definitely_ recording in 1080p. It might also be a good idea to watch on your laptop instead of a phone if you’re not already doing that If all else fails, I do have the files linked in the video description - (but that obviously sucks)

@KarmaRyder 8 месяцев назад

Keep making these videos. Lot of good ideas. However the important bits could be edited

@AmolGautam 6 месяцев назад

Thank you so much.

@waynezhao5839 7 месяцев назад

Maybe I missed this part. How would you handle friends of friends relation look up between two celebrities for example Taylor Swift and Elon Musk, who both have tens of millions followers (assuming they don't follow each other), you didn't seem to talk about the scalability challenges in this case?

@SDFC 7 месяцев назад

That's a great question! That would of course be referencing the reason for _why_ twitter now switched from the fan-out approach being used throughout this video over to a hybrid approach IIRC, both Facebook and LinkedIn have an actual limit to the number of bi-directional "connections" that a person can have, but not "followers". I think it's more likely that being a "follower" (which requires that the influencer switches to a specific account type that allows for that action on their account) are treated differently and won't get fanned out e.g. you can currently do a LinkedIn search for accounts that are fans of a specific influencer. But when you do a "friends of friends" lookup, it's not going to show the millions of other followers of your followed influencers in that listing of "friends of friends" -- so, I'm fairly certain it requires a proper two-way "connection" request for a fan-out and not just a one-way "follow" to trigger the fan-out

@cairuliao9656 4 месяца назад

can we do intersection of friends in memory instead of storing friend of friend

@shotime3241 6 месяцев назад

You say that checking for friends of friends is thousands of queries, but isn't it actually just 2? You query for the friends of UserA and the friends of UserB, and find the intersection. I'm guessing this is how mutual friends works. Haven't watched the whole video yet btw so sorry if you address this.