Відео

Yes you are right if you thinks it as way the app works .... they store the messages in user mobile local storage ... and user also has the option to keep a back up over the google drive but they do store the current messages somewhere because when we use the whats app web they loads all the messages we currently have on our phone .... do they collects those from our phones local storage or they do have a backups ? ... thats i also I want to know ... like how it works ......

Great suggestions. I'll include these topics in the upcoming system design course.

Thanks for the suggestions. I have a video on caching on this channel if you haven't seen it yet, and I'll be sure to cover web workers in detail in my upcoming JavaScript course.

The 20 petabyte estimation in the data estimation section refers to the total data size, including media like images and videos. In reality, only metadata would be stored directly in the database for each tweet. The actual media files themselves would be stored in a separate system, like object storage, as shown later in the video. So your assumption is correct, we don't store these media files in a database. Let me know if you have any follow up questions!

I do touch on accessibility basics in our free Skool community HTML & CSS crash course. While aria attributes aren't specifically covered in this video series, I'll definetly consider creating a more in-depth series on that in the future 👍

It's great to hear that. Hope it sparks some excitement and motivation to dive deeper into web development!

You are welcome!

I agree that JavaScript has its quirks (like any other language), and the ecosystem can feel overwhelming at times. But I wouldn't say there's a mass exodus from JS. Most companies, from startup to big enterprises still rely heavily on JavaScript, and it remains a core technology for the web.

@@hayk.simonyan well startups are using Rust, Go, Zig or Elixir and good brunch going back to Rails or Django so I am not sure if JS has a great future, I am not saying there is an exodus but the community is burnt out with this language that was created in 10 days!!

Totally agree! JavaScript's flexibility is amazing

Glad you think so!

For now I have this portfolio project that is done with HTML, CSS, Scss. I may create another project in the future that will also include JS. Thanks for your suggestion!

Thank you 👍 Cheers!

Good question! While B tree databases could optimize reads for this case, the choice of LSM-based systems (like cassandra) often comes from their great scalability and distributed nature. It also excels at handling high write throughput and horizontal scaling and these features are important for handling the massive traffic and global distribution typical of URL shorteners

@@hayk.simonyan What makes Cassandra better for horizontal scaling compared to something like mysql or postgres? In this scenario, complex multi-shard joins is not really a use case then what makes LSM-based systems scale better?

@@AizazShahid-ck8cn cassandra distributes data evenly and ensures high availability unlike MySQL/postgres, which require complex sharding logic. And in a URL shortener we typically prioritize write performance and scalability over complex multi-shard joins

Thank you. Expect many more videos like these!!

Glad you found the video helpful. Definitely check out the course, and feel free to reach out if you have any questions!

You can deploy both on the same droplet by configuring Nginx to serve your frontend from the root and proxy /api requests to your backend. This way Nginx will handle both frontend and backend on the same server.

@@hayk.simonyan Thank you for your response. Much appreciated.

glad you liked it!

That's awesome! Bootstrap is a great choice to start with 👍

no, low latency was mentioned in non-functional requirements section

Glad you liked it!

Hope it lives up to your expectations :) Feel free to leave any questions or feedback you have after watching.

Glad you found it helpful!

👍

You're very welcome! Glad my explanations were helpful for you as a product manager.

You're welcome! Glad it was helpful.

Glad to hear that 👍

You're welcome. Glad it helped!

The best place to get started is the official docs from the cloud provider you're using. Like from Google cloud CDN or AWS Cloudfront: cloud.google.com/cdn/docs/using-signed-urls, cloud.google.com/cdn/docs/using-signed-cookies docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-urls.html docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html

@@hayk.simonyan thanks!!! I will keep that in mind going forward regarding documentation

I used Keynote for the animations

you're welcome 👍 That's a good idea, I'll make sure to cover Grid as well in one of the upcoming videos

glad you like it 👍

you're welcome!!

Verify that index.html exists in the correct folder that you specified and double-check deployment logs. Additionally, clear the browser cache and try incognito mode

you're welcome!

thanks!!

Glad you like it 👍