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Update principles.md

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Brian Grant 2017-02-20 08:42:08 -08:00 committed by GitHub
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@ -30,6 +30,7 @@ implementation-oriented (think control knobs).
given the desired state and the current/observed state, regardless of how many given the desired state and the current/observed state, regardless of how many
intermediate state updates may have been missed. Edge-triggered behavior must be intermediate state updates may have been missed. Edge-triggered behavior must be
just an optimization. just an optimization.
* There should be a CAP-like theorem regarding the tradeoffs between driving control loops via polling or events about simultaneously achieving high performance, reliability, and simplicity -- pick any 2.
* Assume an open world: continually verify assumptions and gracefully adapt to * Assume an open world: continually verify assumptions and gracefully adapt to
external events and/or actors. Example: we allow users to kill pods under external events and/or actors. Example: we allow users to kill pods under
control of a replication controller; it just replaces them. control of a replication controller; it just replaces them.