Lessons learned in incident management
At Dropbox, we view incident management as a central element of our reliability efforts. Though we also employ proactive techniques such as Chaos engineering, how we respond to incidents has a significant bearing on our users’ experience. Every minute counts for our users during a potential site outage or product issue. The key components of our incident management process have been in place for s
Testing sync at Dropbox
…and how we rewrote the heart of sync with confidence. Executing a full rewrite of the Dropbox sync engine was pretty daunting. (Read more about our goals and how we made the decision in our previous post here.) Doing so meant taking the engine that powers Dropbox on hundreds of millions of user’s machines and swapping it out mid-flight. To pull this off, we knew we would need a serious investment
Athena: Our automated build health management system
At Dropbox, we run more than 35,000 builds and millions of automated tests every day. With so many tests, a few are bound to fail non-deterministically or “flake.” Some new code submissions are bound to break the build, which prevents developers from cutting a new release. At this scale, it’s critical we minimize the manual intervention necessary to temporarily disable flaky tests, revert build-br
Continuous integration and deployment with Bazel
Dropbox server-side software lives in a large monorepo. One lesson we’ve learned scaling the monorepo is to minimize the number of global operations that operate on the repository as a whole. Years ago, it was reasonable to run our entire test corpus on every commit to the repository. This scheme became untenable as we added more tests. One obvious inefficiency is the pointless and wasteful execut
Introducing WebAuthn support for secure Dropbox sign in
The easiest way to keep a secret is to not tell it to anyone. Unfortunately passwords don’t work that way. Every time you sign in you have to tell the website your password, making it more challenging to keep the secret safe. That’s why we recommend turning on two-step verification for your account, which adds an extra layer of difficulty for anyone who has guessed, eavesdropped on, or tricked you
Lepton image compression: saving 22% losslessly from images at 15MB/s | Dropbox Tech Blog
Lepton image compression: saving 22% losslessly from images at 15MB/s This open-source project is no longer maintained or supported by Dropbox. Please refer to Lepton’s GitHub page for more information. ~ ~ ~ We are pleased to announce the open source release of Lepton, our new streaming image compression format, under the Apache license. Lepton achieves a 22% savings reduction for existing JPEG i
Streaming File Synchronization
Our users love Dropbox for many reasons, sync performance being chief among them. We’re going to look at a recent performance improvement called Streaming Sync which can improve sync latency by up to 2x. Prior to Streaming Sync, file synchronization was partitioned into two phases: upload and download. The entire file must be uploaded to our servers and committed to our databases before any other
Scaling MongoDB at Mailbox
Mailbox has grown unbelievably quickly. During that growth, one performance issue that impacted us was MongoDB’s database-level write lock. The amount of time Mailbox’s backends were waiting for the write lock was resulting in user-perceived latency. While MongoDB allows you to add shards to a MongoDB cluster easily, we wanted to spare ourselves potential long-term pain by moving one of the most f
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