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Published
February 16, 2017
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Estimated reading time: 2 minutes

Fault Domains and the Vegas Rule

By in General on February 16, 2017 | Responses (1)

Our teams at Expedia are active public cloud users. We use a simple design principle called the “Vegas Rule”, and a complimentary concept called “fault domain” to make resiliency-related decisions. Fault Domain A fault domain is a coarse-grained enclosure of apps, data and all the dependent infrastructure. Below is an example. The outer circle represents a fault domain. The primary property of a fault domain is that any fault inside the fault domain does not cascade outside. Any external dependency is soft, and the the services in the fault domain…

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Published
December 11, 2016
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Estimated reading time: 3 minutes

Cloud Lock-In and Change Agility

By in Cloud, Culture on December 11, 2016 | Responses (1)

TL;DR Don’t Focus on Lock-In Insulation — Focus on Change Agility We are entering into a future of lock-in. Public clouds are no longer someone else’s computers or hosted services. These are fast becoming proprietary platforms with a bit of open source sprinkled in here and there. Almost everything you need to run an enterprise is now available as a pay-as-you-go platform on AWS, and Azure and GCP are not staying put. As difficult as it may be to swallow and accept this trend, it is important recognize that, anything that needs…

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Cloud helper, Vice President of Technology at Expedia