When Reverse Proxies Surprise You: Hard Lessons from Operating at Scale
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Operating reverse proxy fleets at massive scale reveals counterintuitive lessons: optimizations like freelists and RCU that work on small systems can collapse under high-core loads due to lock contention; mundane issues like missing commas in metadata, file descriptor limits, and process cleanup scripts cause major outages; seemingly trivial operations like header parsing and random number generation become bottlenecks when profiled in production; designing for exceptions rather than the common path degrades performance for everyone; and recovery during incidents depends on basic tools and simple mechanisms when sophisticated dashboards fail.
Table of contents
The Critical Fragility of the Proxy LayerThe Optimization Trap: When Tuning Becomes ToxicThe Mundane Outage: When Defaults and Routine Tasks Bite BackTrust But Verify: Measuring the Hot PathExceptions Are Not the Norm: Keeping the Common Path CleanDesign for the Operator Under StressConclusionAbout the AuthorSort: