Skip to main content

> ep_015

Cache Expired During Demo

Cache Expired During Demo

Cache Expired During Demo Thumbnail

Available Video Versions

16:9
v1Default
9:16
Defaultv2
Watch video

Cache Expired During Demo

"The system failed exactly the way the roadmap trained it to fail."

What this episode is really about

The Pretend: caching, demo environments, TTLs, brittle performance assumptions.

What Actually Happened: The demo was fast because the truth was cached, and the cache had a calendar.

Incident Type: Production Incident | Failure Pattern: cache invalidation drift

Technical takeaway

Cache Expired During Demo

How it appears in real teams

Cache Expired During Demo

What teams should watch for

Detection Signals:

  • Alerts firing

Prevention Checklist:

  • [ ] Test thoroughly
  • [ ] Review code

Premortem Questions: What happens if this breaks?

Postmortem Lessons: We should have tested this.

  • Test thoroughly
  • Review code

Transcript

Draft script (not verified video transcript)

[Junior Developer] The demo is loading slower than rehearsal.

[Cache Guy] That is because rehearsal was from yesterday’s memory.

[Junior Developer] So the feature was fast in the past?

[Tiny CTO] Many systems are excellent historians.

[Cache Guy] The cache expired right when leadership arrived!

[Junior Developer] Can we extend the TTL?

[Tiny CTO] Yes, if the business accepts time travel as architecture.

[Cache Guy] I prefer the term strategic remembering.

Frequently Asked Questions

What is the main lesson?

Performance based on stale cached state is not performance, it is borrowed confidence.

Who should watch it?

Frontend engineers, platform teams, product leaders, and demo owners.

What should teams do differently?

Do not mistake cache warmth for production performance.

AI summary

A TinyCTO.tv technical parable about caching, demo environments, TTLs, brittle performance assumptions. The episode shows that Performance based on stale cached state is not performance, it is borrowed confidence.