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Colin Scott

Colin Scott

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    CAPA: An Architecture For Operating Cluster Networks With High Availability
    Bingzhe Liu
    Mukarram Tariq
    Omid Alipourfard
    Rich Alimi
    Deepak Arulkannan
    Virginia Beauregard
    Patrick Conner
    Brighten Godfrey
    Xander Lin
    Mayur Patel
    Joon Ong
    Amr Sabaa
    Alex Smirnov
    Manish Verma
    Prerepa Viswanadham
    Google, Google, 1600 Amphitheatre Pkwy, Mountain View, CA 94043 (2023)
    Preview abstract Management operations are a major source of outages for networks. A number of best practices designed to reduce and mitigate such outages are well known, but their enforcement has been challenging, leaving the network vulnerable to inadvertent mistakes and gaps which repeatedly result in outages. We present our experiences with CAPA, Google’s “containment and prevention architecture” for regulating management operations on our cluster networking fleet. Our goal with CAPA is to limit the systems where strict adherence to best practices is required, so that availability of the network is not dependent on the good intentions of every engineer and operator. We enumerate the features of CAPA which we have found to be necessary to effectively enforce best practices within a thin “regulation“ layer. We evaluate CAPA based on case studies of outages prevented, counterfactual analysis of past incidents, and known limitations. Management-plane-related outages have substantially reduced both in frequency and severity, with a 82% reduction in cumulative duration of incidents normalized to fleet size over five years View details
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