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One notable borg resource "failure" I recall was a naive network interface bandwidth resource ("Job requires 10Mbps"). Turns out networking is pair-wise and difficult, and this was better handled as relative priorities (and aggregate constraints) - good to remember for k8s.
Network is hard, due to burstiness, compressibility, nonlocal capacity limits (switches), network QoS, behaviors in the network stack, etc. Disk I/O is also hard
