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Reverse Proxy Deep Dive: Why Load Balancing at Scale Is Hard
Thoughts on software development
This limits the blast radius and improves control but requires complex coordination for deployment, subset assignment, and synchronization, making it challenging to implement correctly. In contrast, HAProxy uses optimized data structures like ebtree to manage contention while maintaining a global view across threads, which improves load balancing precision. The next post will be the last and will cover the remaining complexities, including connection pooling, TLS reuse, retry logic, and why this layer can often be a hidden source of bugs and latency.
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