Martin Průša

Senior Mobile Architect, I love to code iOS/Mac/watchOS/tvOS apps e-mail: [email protected]. Author of eDálnice iOS app

[AI_Explorer @ai_explorer25]

STEVE JOBS GOT FIRED FROM APPLE.

Then he walked straight into MIT and dropped the most raw, unfiltered 60-minute business masterclass ever recorded.

Zero PR bullshit. Zero image to protect.

Just pure, brutal honesty from the man who built Apple once and was about to rebuild it even bigger.

Stop scrolling.

Watch this tonight instead of Netflix.

Bookmark it. Come back to it.

[Bhavika Agarwal @Ai_Tech_tool]

Instead of watching an hour of Netflix, watch this 2 hour hour Stanford lecture will teach you more about how LLMs like ChatGPT and Claude are built than most people working at top AI companies learn in their entire careers.

[Martin Průša @m_prusa]

@ameliagwen132 Hi 🙋🏻‍♂️

[Martin Průša @m_prusa]

@novasport_cz Nenažraná nova! Vraťte se zpět do školních lavic naučit se, jak nenasrat diváka.! Pokazili jste svou nevhodně načasovanou reklamou hlavní zápas UFC 303!

[Martin Průša @m_prusa]

@novasport_cz Nenažraná nova! Vraťte se zpět do školních lavic naučit se, jak nenasrat diváka.

[Martin Průša @m_prusa]

@komercka To jsou ty páteční deploye do produkce 😂

[Martin Průša @m_prusa]

@gittower @gittower guys could you please add feature show in finder when right click on file?

[MrBeast @MrBeast]

I’m gonna give 10 random people that repost this and follow me $25,000 for fun (the $250,000 my X video made)

I’ll pick the winners in 72 hours

[Martin Průša @m_prusa]

@BlizzardCSEU_EN Its working D4 on xbox just went through the login

[Martin Průša @m_prusa]

@BlizzardCSEU_EN Its working D4 on xbox just went through the login

[System Design Codex @ProgressiveCod2]

This brilliant technique for handling database queries literally saved Discord.

It helped them store trillions of messages and fetch them without bringing their DB cluster to its knees.

The technique is called Request Coalescing.

And it’s too good to ignore.

But what’s so special about it?

If multiple users are requesting the same row at the same time, why not query the database only once?

This is exactly what Request Coalescing helps us achieve.

Here’s what happens under the hood:

- The first user that makes a request causes a worker task to spin up in the data service
- Subsequent requests for the same data will check for the existence of that task and subscribe to it
- Once the initial worker task queries the database and gets the result, it will return the row to all subscribers at the same time.

There are several pros to using Request Coalescing:

- Efficient utilization of database resources
- Ability to handle more concurrent requests without creating hot partitions
- Reduce latency

But there are some cons as well:

- Implementation can be complex with regards to getting a fair distributed reader-write lock. Basically, multiple readers need to access the data simultaneously while preventing conflicting writes
- Overall latency may go down, but certain requests will take more time

Of course, this technique is NOT needed normally.

But at a certain scale, it can actually save your business.

===

That’s all for now!

If you enjoyed this post, don’t forget to:

- Destroy the LIKE button
- REPOST so that everyone can try Request Coalescing wherever applicable.
- BOOKMARK for future reference
- Follow me for more posts like this.

[Marcin Kliks @vi4m]

You always ask me, why I use #swift for backends. Answer: Because it’s soooo cheap to run, having low memory footprint.

Running under 30 MB of RAM it fits a lot of these in just a 1 AWS instance. I would have to pay 10x more for Java / Spring. And it’s type safe.

#vapor #swift

[Martin Průša @m_prusa]

@everton_dev i don’t like unowned, do you guys use it?

[Martin Průša @m_prusa]

Is there worse piece of software than MS Teams?

[Martin Průša @m_prusa]

@myridiphis You can also use https://t.co/zMZUEe3m21, or https://t.co/v4HBuuyzth

[Martin Průša @m_prusa]

@komercka Ani nyní systém nefunguje, nejde na��íst zůstatek ani převést peníze.

[Martin Průša @m_prusa]

@JonyIveParody I like to play StarCraft II on my Mac.

[Martin Průša @m_prusa]

@krzyzanowskim ModelVolkswagenModel is MVVM?

[Martin Průša @m_prusa]

My new tiny app to check cz toll-sticker, completely in SwiftUI 3.0.
https://t.co/WstxLcuUc2
#swiftui #swift