The Hidden Risk of a Meltdown in the Cloud: Now Ford imagines the scenario in which both load balancing programs operate with the same refresh period, say once a minute. When these periods coincide, the control loops start sending the load back and forth between the virtual servers in a positive feedback loop.
"The two controllers each compensate with a stronger action causing a larger swing the next minute," says Ford. Clearly, this is a process that must eventually spiral out of control and crash the system.
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