一行代码花费了$8,000
TLDR
TLDR
Due to a bug, our screen recorder app - screen.studio app kept downloading the auto-update file repeatedly, every 5 minutes for every single user. The update file is approximately 250MB. This resulted in 9 million file downloads and more than 2 petabytes (2,000,000 gigabytes) of traffic on Google Cloud.
由于一个错误，我们的屏幕录制应用程序 - screen.studio 应用程序不断重复下载自动更新文件，每个用户每5分钟一次。更新文件大约为250MB。这导致了900万次文件下载和超过2PB（2,000,000GB）的Google Cloud流量。
This screenshot might not look so scary at first, but take a look at the scale of it. For over a month, we generated at least 100Mib/s (a second!) and, at times, almost 1GiB/s of traffic (every single second!)
这张截图乍一看可能并不那么可怕，但看看它的规模。在一个多月的时间里，我们每秒生成至少100Mib/s的流量（每秒！），有时几乎达到1GiB/s的流量（每一秒！）
That bug was painfully simple and stupid.
那个错误简单得令人痛苦且愚蠢。
Screen Studio is a screen recorder for macOS. It is desktop app. It means we need some auto-updater to allow users to install the latest app version easily.
Screen Studio 是一款适用于 macOS 的屏幕录制软件。它是桌面应用程序。这意味着我们需要一些自动更新程序，以便用户能够轻松安装最新的应用版本。
The app checks for the update every 5 minutes or when the user activates the app.
应用程序每 5 分钟检查一次更新，或者在用户激活应用程序时检查。
Normally, when the app detected the update - it downloaded it and stopped the 5 minutes interval until the user installed it and restarted it.
通常，当应用程序检测到更新时，它会下载更新并停止5分钟的间隔，直到用户安装并重新启动它。
Tragic refactor
悲惨的重构
The problem with the auto-updater we had was that it would prompt the user to update the app as soon as it became available. This resulted in a popup appearing while users were recording the screen, which obviously provided a bad experience as it interrupted the recording the user was making.
我们遇到的自动更新程序的问题是，它会在应用程序可用时立即提示用户更新。这导致在用户录制屏幕时弹出窗口出现，显然提供了糟糕的体验，因为它打断了用户的录制。
While refactoring it, I forgot to add the code to stop the 5-minute interval after the new version file was available and downloaded.
在重构时，我忘记添加代码以在新版本文件可用并下载后停止5分钟的间隔。
It meant the app was downloading the same 250MB file, over and over again, every 5 minutes.
这意味着该应用程序每5分钟下载同一个250MB的文件，一遍又一遍。