Explore how Yelp.com leverages Apache Mesos and AWS Spot Fleet to optimize infrastructure costs and operational efficiency in this 36-minute Linux Foundation conference talk. Dive into the intricacies of balancing significant cost savings with potential operational risks associated with AWS Spot Instances. Learn about Yelp's custom configuration tweaks for Mesos, Marathon, Chronos, and autoscalers that ensure reliable infrastructure. Discover the power of Terraform in managing Spot Fleet, best practices for diversification, bidding strategies, and maintenance primitives. Gain insights into the cost-benefit analysis of using Spot Fleet and understand the key considerations for implementing this approach in your own infrastructure. Follow along as Kyle Anderson, a Site Reliability Engineer at Yelp, shares valuable lessons and practical tips for running a major web platform on theoretically unstable yet highly cost-effective infrastructure.