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Learning Objectives & Key Takeaways
0 / 4 Completed- Understand Concurrency core architecture and runtime execution model
- Audit real-world latency, throughput benchmarks, and memory footprint
- Implement zero-downtime deployment patterns with resilience guards
- Verify code snippets and architect blueprints against production SLOs
Practise it next
Concurrency interview questions, quiz and handbook in your Learning Dashboard
What you will learn
- Concurrency is about dealing with many things at once; parallelism is doing them at once.
- A race condition happens when the result depends on timing.
- Atomic operations, locks and idempotency prevent lost updates.
Bugs that only appear under load
Two requests read a seat count of 1, both see it available, both book it. Each request was correct; together they oversold the seat. That is a race condition, and it never shows up when you test alone.
Every backend developer meets these bugs, even in single-threaded JavaScript, because requests and database transactions interleave.
In the rest of this story
- Concepts in plain words
- Fixing a lost update
- How to reason about it
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