tl;dr:"I hear the misconception that a server can only accept 65K connections or a server consumes a port for each accepted connection all the time." Joseph wrote this article to dispel this myth from 3 angles.
tl;dr:Joseph received a bug report claiming he "caused 100% CPU util on a VM when it should have been idle." He runs a retrospective on what the issue was and how else it could have been handled.