A post office sorting room
Day 49 of 149
👉 Full deep-dive with code examples
The Post Office
You drop off 100 letters.
Post office doesn't deliver all 100 instantly!
- Letters go into a sorting room
- Workers pick up and deliver one by one
- Even if you send 1000, they handle the pace
Message queues work the same way!
The Problem
Your app gets 10,000 orders in 1 second.
Processing each can take a while.
Without queue: Server overloads and crashes! 💥
The Solution
Orders go into a queue:
[Order 1] → [Order 2] → [Order 3] → ...
↓
Worker picks up, processes at its own pace
- Orders are stored durably (less likely to be lost)
- Orders are buffered (and are less likely to be lost, depending on how the queue is configured)
- System processes at sustainable speed
- Senders don't have to wait
Famous Message Queues
- RabbitMQ
- Apache Kafka
- Amazon SQS
- Redis (can work as queue)
When to Use
- Handling traffic spikes
- Long-running tasks
- Communication between services
- Anything that shouldn't block
In One Sentence
Message queues hold tasks in line and let workers process them at a sustainable pace, preventing overload.
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