Global Shortage Has Led to Motor Oil Rationing at Costco

Redis Is Not Your Database: Designing Cache Failures, Fallbacks, and Resilient Backends

Redis can make a backend dramatically faster. It can also make a backend dramatically more fragile if the architecture treats the cache as a dependency that must always be available.

2026-09-13 ·dev.to

One instance was bad at its job and nothing was designed to notice

Checkout errors sat between three and eight percent for most of a Thursday. Not enough to page, because our threshold is one percent sustained across the service and the service was at 0.4.

2026-09-13 ·dev.to

I labelled a dependency cycle "unknown" and called it rigour

I have spent a while arguing that checks need a third value: not every result is pass or fail, and folding "I could not determine this" into either one is how a suite starts lying.

• The author proposes labeling dependency cycles as UNKNOWN instead of FAIL.
• UNKNOWN indicates undetermined outcomes, while FAIL denotes actual failures.
• Implementing this distinction prevents hiding failures and enables informed decisions.

2026-09-13 ·dev.to

Mainframe Migration Tools: What Works and What Fails

Every mainframe migration begins with someone searching for mainframe migration tools, and every vendor demonstration that follows looks remarkably convincing.

• Discovery and analysis tools are most valuable for understanding complex mainframe environments.
• Rehosting platforms are predictable but don't address COBOL codebase maintenance.

2026-09-13 ·dev.to