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﹃Dropbox Tech Blog﹄
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3users
dropbox.tech
Bye Bye Bye...: Evolution of repeated token attacks on ChatGPT models We recently discovered a new training data extraction vulnerability involving OpenAI’s chat completion models (including GPT-3.5 and GPT-4). This work builds upon prior Dropbox LLM prompt injection research as well as that of academic researchers. Our findings were shared with OpenAI in January 2024, confirmed as vulnerabilities
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テクノロジー
●2024/03/20 10:28
5users
dropbox.tech
When was the last time you were about to click a button on a website, only to have the page shift—causing you to click the wrong button instead? Or the last time you rage-quit a page that took too long to load? These problems are only amplified in applications as rich and interactive as ours. The more front-end code is written to support more complex features, the more bytes are sent to the browse
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テクノロジー
●2023/08/16 23:33
●article
●JavaScript
●あとで読む
8users
dropbox.tech
After four years of SMR storage, here's what we love—and what comes next In 2018, Dropbox became the first major tech company to adopt high-density SMR (shingled magnetic recording) technology for our storage drives. By 2019, our SMR fleet size was around 25%. Today, a staggering 90% of our total HDD fleet size is now SMR capable, and we’ve continued to lead the industry in adoption with the deplo
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世の中
●2023/06/11 14:20
●hardware
●あとで読む
3users
dropbox.tech
Investigating the impact of HTTP3 on network latency for search Dropbox is well known for storing users’ files—but it’s equally important we can retrieve content quickly when our users need it most. For the Retrieval Experiences team, that means building a search experience that is as fast, simple, and powerful as possible. But when we conducted a research study in July 2022, one of the most commo
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学び
●2023/05/17 11:52
4users
dropbox.tech
How we handled a recent phishing incident that targeted Dropbox We were recently the target of a phishing campaign that successfully accessed some of the code we store in GitHub. No one’s content, passwords, or payment information was accessed, and the issue was quickly resolved. Our core apps and infrastructure were also unaffected, as access to this code is even more limited and strictly control
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テクノロジー
●2022/11/02 12:38
●security
3users
dropbox.tech
Looking for our latest Engineering Career Framework? We made some updates in 2023. Learn more about the newest version. ~ ~ ~ At Dropbox, we strive to be a great place for all engineers to grow and be recognized for that growth. Our Engineering Career Framework helps keep us accountable there and is viewable by anyone within the company. Today, we are also making it viewable by anyone outside the
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テクノロジー
●2021/07/13 14:24
4users
dropbox.tech
It’s probably happened to you at some point: You go to use a service for which you believe you’ve got a paid subscription, only to find that it’s been canceled for non-payment. That’s not only bad for you the customer: It causes negative feelings about the brand, it disrupts what should be a steady flow of revenue to the business, and a customer who finds themselves shut off might decide not to co
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テクノロジー
●2021/05/18 11:29
●payment
●dropbox
●study
5users
dropbox.tech
Photos are among the most common types of files in Dropbox, but searching for them by filename is even less productive than it is for text-based files. When you're looking for that photo from a picnic a few years ago, you surely don't remember that the filename set by your camera was 2017-07-04 12.37.54.jpg. Instead, you look at individual photos, or thumbnails of them, and try to identify object
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テクノロジー
●2021/05/12 17:49
●search
4users
dropbox.tech
Memory leaks occur when an application allocates memory for an object, but then fails to release the memory when the object is no longer being used. Over time, leaked memory accumulates and results in poor app performance and even crashes. Leaks can happen in any program and on any platform, but they’re especially prevalent in Android apps due to complications with activity lifecycles. Recent Andr
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テクノロジー
●2021/03/25 07:49
●android
5users
dropbox.tech
Application startup is the first thing our users experience after they install an app and then again every single time they launch it. A simple and snappy application brings users a lot more joy than an application that has a ton of features but takes an eternity to load. Realizing this, Dropbox Android team has invested in measuring, identifying, and fixing the issues that were affecting our app
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テクノロジー
●2021/02/10 10:13
●performance
●android
●tips
4users
dropbox.tech
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
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テクノロジー
●2021/01/06 09:10
●security
13users
dropbox.tech
I joined Dropbox not long after graduating with a Master’s degree in computer science. Aside from an internship, this was my first big-league engineering job. My team had already begun designing a critical internal service that most of our software would use: It would handle asynchronous computing requests behind the scenes, powering everything from dragging a file into a Dropbox folder to schedul
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テクノロジー
●2020/11/12 09:20
●dropbox
●architecture
●programming
32users
dropbox.tech
HelloSign is a Dropbox company that provides a Web-based eSignature solution: If you have a document you want someone to sign, you upload the document file, then show you an editor in which you place all the fields to build the form the recipient will fill out—signatures, dates, initials, etc. You send this prepared form to the recipient. When they’re done signing, everything is reassembled into a
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テクノロジー
●2020/10/02 11:51
●react
●jQuery
●あとで読む
●article
5users
dropbox.tech
// By Rishabh Jain and Daniel Reiter Horn • Aug 04, 2020 Dropbox syncs petabytes of data every day across millions of desktop clients. It is vital that we constantly improve the sync experience for our users, to increase our users’ productivity in their everyday lives. We also constantly strive to better leverage our infrastructure, increasing Dropbox’s operational efficiency. Because the files th
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テクノロジー
●2020/08/05 02:17
●compression
123 users
dropbox.tech
In this blogpost we’ll talk about the old Nginx-based traffic infrastructure, its pain points, and the benefits we gained by migrating to Envoy. We’ll compare Nginx to Envoy across many software engineering and operational dimensions. We’ll also briefly touch on the migration process, its current state, and some of the problems encountered on the way. When we moved most of Dropbox traffic to Envoy
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テクノロジー
●2020/07/31 02:48
●envoy
●nginx
●dropbox
●performance
●infrastructure
●あとで読む
●Kubernetes
●server
7users
dropbox.tech
Speeding up a Git monorepo at Dropbox with <200 lines of code We migrated from Mercurial to Git in 2014 to improve local performance and began consolidating our repositories that hosted our backend code. But as this monorepo grew, we experienced Git performance issues that grew linearly with the number of files we added. Inconveniently, this problem was the most severe on macOS—the platform most o
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テクノロジー
●2020/06/11 07:31
8users
dropbox.tech
Editor’s preface: When I first joined Dropbox in May 2017, we were at the tail end of our CoffeeScript to TypeScript migration. If you wanted to make changes to a CoffeeScript file, it was considered common courtesy to convert it to TypeScript while you were at it. Parts of our codebase were still using react-dom-factories and we had a custom flux implementation predating Redux. I knew our web pla
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テクノロジー
●2020/05/16 09:31
●typescript
●coffeescript
●javascript
21users
dropbox.tech
…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
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テクノロジー
●2020/04/21 14:43
●dropbox
●Rust
●testing
●test
●プログラミング
●programming
39users
dropbox.tech
Over the past four years, we've been working hard on rebuilding our desktop client's sync engine from scratch. The sync engine is the magic behind the Dropbox folder on your desktop computer, and it's one of the oldest and most important pieces of code at Dropbox. We're proud to announce today that we've shipped this new sync engine (codenamed "Nucleus") to all Dropbox users. Rewriting the sync en
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テクノロジー
●2020/03/17 15:31
●Rust
●dropbox
●filesystem
●performance
●programming
●design
●あとで読む
7users
dropbox.tech
The Dropbox Traffic team is charged with innovating our application networking stack to improve the experience for every one of our users—over half a billion of them. This article describes our work with NS1 to optimize our intelligent DNS-based global load balancing for corner cases that we uncovered while improving our point of presence (PoP) selection automation for our edge network.By co-devel
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テクノロジー
●2020/01/09 10:16
●DNS
●network
●あとで読む
22users
dropbox.tech
Spoiler alert: BBRv2 is slower than BBRv1 but that’s a good thing. Three years have passed since “ Bottleneck Bandwidth and Round-trip” (BBR) congestion control was released. Nowadays, it is considered production-ready and added to Linux, FreeBSD, and Chrome (as part of QUIC.) In our blogpost from 2017, “ Optimizing web servers for high throughput and low latency,” we evaluated BBRv1 congestion co
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テクノロジー
●2019/12/18 09:01
●.net
●研究
●あとで読む
5users
dropbox.tech
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
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テクノロジー
●2019/12/12 14:36
●dropbox
●test
35users
dropbox.tech
Dropbox is a big user of Python. It’s our most widely used language both for backend services and the desktop client app (we are also heavy users of Go, TypeScript, and Rust). At our scale—millions of lines of Python—the dynamic typing in Python made code needlessly hard to understand and started to seriously impact productivity. To mitigate this, we have been gradually migrating our code to stati
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テクノロジー
●2019/09/08 17:13
●mypy
●python
●dropbox
●type
●Programming
●あとで読む
28users
dropbox.tech
The (not so) hidden cost of sharing code between iOS and Android Until very recently, Dropbox had a technical strategy on mobile of sharing code between iOS and Android via C++. The idea behind this strategy was simple—write the code once in C++ instead of twice in Java and Objective C. We adopted this C++ strategy back in 2013, when our mobile engineering team was relatively small and needed to s
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テクノロジー
●2019/08/15 11:47
●ios
●android
●あとで読む
3users
dropbox.tech
This article assumes a working knowledge of Redux, React, React-Redux, TypeScript, and uses a little bit of Lodash for convenience. If you’re not familiar with those subjects, you might need to do some Googling. You can find the final version of all the code here. Redux has become the go-to state management system for React applications. While plenty of material exists about Redux best practices i
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テクノロジー
●2019/07/17 21:10
14users
dropbox.tech
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
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テクノロジー
●2019/05/24 11:06
●dropbox
●test
●management
●article
●it
●blog
●あとで読む
5users
dropbox.tech
Apache Kafka is a popular solution for distributed streaming and queuing for large amounts of data. It is widely adopted in the technology industry, and Dropbox is no exception. Kafka plays an important role in the data fabric of many of our critical distributed systems: data analytics, machine learning, monitoring, search, and stream processing ( Cape), to name a few. At Dropbox, Kafka clusters a
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テクノロジー
●2019/01/31 11:46
●Kafka
10users
dropbox.tech
// By Reza Ahmad , Matt Cote , David Fiedler , and Bryan Seitz • Jan 16, 2019 As a company that manages our own infrastructure we need to be able to rapidly install new server capacity and ensure that the equipment entering our production environment is highly reliable. Prior to the creation and implementation of the Pirlo system, engineering personnel at Dropbox manually intervened in most aspect
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テクノロジー
●2019/01/17 10:20
●あとで読む
31users
dropbox.tech
// By Ruslan Nigmatullin and Alexey Ivanov • Jan 08, 2019 Dropbox runs hundreds of services, written in different languages, which exchange millions of requests per second. At the core of our Service Oriented Architecture is Courier, our gRPC-based Remote Procedure Call (RPC) framework. While developing Courier, we learned a lot about extending gRPC, optimizing performance for scale, and providing
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テクノロジー
●2019/01/09 08:17
●gRPC
●article
●あとで読む
●web
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