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Nothing here tells us how to solve problems universally, but that is the point. Stories like these are far more valuable than the code or designs they resulted in. Implementations are ephemeral, but the documented reasoning is priceless. Rarely do we have access to this kind of insights.

In other words, given the relative insensitivity of the AdSense service to moderate changes in latency performance, we are able to consolidate serving into fewer geographical locations, reducing our operational overhead.

One useful strategy may be consider the background error rate of ISPs on the Internet. If failures are being measured from the end-user perspective and it is possible to drive the error rate for the service below the background error rate, those errors will fall within the noise for the given user's internet connection.

This kind of tension is common within a team, and often reflects an underlying mistrust of the team's discipline: while some team members want to implement a "hack" to allow time for a proper fix, others worry that a hack will be forgotten or that the proper fix will be deprioritized indefinitely. This concern is credible, as it's easy to build layers of unmaintainable technical debt by patching over problems instead of making real fixes. Managers and technical leaders play a key role in implementing true, long-term fixes by supporting and prioritizing potentially time-consuming long-term fixes even when the initial "pain" of paging subsides.

Essential complexity is the complexity inherent in a given situation that cannot be removed from a problem definition, whereas accidental complexity is more fluid and can be resolved with engineering effort

研发部门最关注的是如何能够更快速地构建和发布新功能。运维部门更关注的是如何能在他们值班期间避免发生故障。

研发部门想要：“随时随地发布新功能，没有任何阻拦”，而运维部门则想要：“一旦一个东西在生产环境中正常工作了，就不要再进行任何改动。”

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