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The Scalable Thread

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One well-researched system design article simplified like you're five, every two weeks!

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Latest Issues

Why are Event-Driven Systems Hard?

An event is just a small message that says, "Hey, something happened!" For example, UserClickedButton, PaymentProcessed, or NewOrderPlaced. Services subscribe to the events they care about and react accordingly. This event-driven appr...

8 months ago
100
5

Why "What Happened First?" Is One of the Hardest Questions in Large-Scale Systems

The Problem with Time

Imagine you and your friend are in different cities. You both look at your watches and agree to clap at exactly 1:00 PM. You clap, but did you both clap at the exact same instant? Probably not. Your watch might be...

9 months ago
34
6

How to Keep Services Running During Failures?

In software applications, a server can fail, a database can become unresponsive, or a sudden traffic surge can overload the system. Most of the time, this is bad news. But what if there was a way to survive the chaos? What if your app, inst...

9 months ago
52
1

How to Optimize Performance with Cache Warming?

What is Cache Warming?

When a request arrives for data that isn't in the cache (cache miss or cold cache), the system must retrieve it from the primary database or service. This process introduces latency, as fetching data from disk-bas...

10 months ago
26

How Tool Calling Works in LLMs

A Large Language Model’s (LLM’s) internal knowledge is limited to the data it was trained on, which can be outdated or lack direct access to real-time data, proprietary systems, or complex computational functions. Tool calling extends the c...

a year ago
33
1

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