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Meet the Rustaceans: Pedro Rittner

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This article was written in collaboration with Pedro Rittner, a Production Engineer at Facebook.

For today’s interview, we have Pedro Rittner who is a Production Engineer on the Device Integration, Assessment, and Grokking team at Facebook. The Device Integration, Assessment and Grokking team develops core hardware tooling and automation frameworks to report, control, monitor, analyze and fix hardware. Pedro has been using Rust as the main language for development. He primarily works on building the frameworks that Facebook uses to validate the health of hosts across the server fleet. Let’s hear from him about how his experience with Rust has been and learn more about his work.


In what capacity have you been using Rust?

Our team uses Rust as the language of choice for the majority of our backend services. These services perform the hardware health assessments of hundreds of thousands of machines every day. A good portion of our tooling (mostly CLIs) are also written in Rust.

Why did you/your team at Facebook choose to use Rust over other languages?

We chose Rust for our backend services because we prioritize reliability and efficiency in production. We found that our legacy Python infrastructure wasn’t able to scale to meet our needs as Facebook’s fleet grows, and we also had been bitten many times by Python runtime gotchas that can be completely avoided by using Rust.

What are some of the projects that you’ve worked on at Facebook that use Rust?

I’ve implemented several projects using Rust, in my current team and in others:

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  • A distributed data stream tailer that collects and processes hardware health data from the entire hardware fleet
  • A blackhole email daemon to test our E2E email sending flows that can sustain millions of SMTP transactions per minute
  • A distributed queue worker service that performs millions of hardware health assessments on the entire hardware fleet every day
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How do you feel about Rust’s growth trajectory at Facebook?

Facebook has published several of our Rust projects on Github, and our engineers regularly contribute to rustc upstream.

How do you think Rust is growing as a language in 2021?

I believe that Rust is growing steadily in adoption across the industry this year. With the stabilization of several key components of the Rust ecosystem (e.g. the bytes and tokio crates hitting 1.0), Rust is well-positioned to capitalize on the growing need for more reliable services.

Some people who have used Rust have come to really like it, why do you think that is and what is your favorite feature about Rust?

My favorite feature about Rust is being able to delegate a lot of the “paranoid thinking” I developed from a decade of writing C++ code. Normally with C++ I have to be on my guard with memory usage and be very careful not to introduce UB into my codebase. Rust helps me avoid this cognitive overload by having the compiler enforce this for me.

Where can people learn more about Rust and how can they start contributing to it?

I would definitely recommend using the Rust by example book as a starting point. If you’re already familiar with programming in C++ or Python, learning by example can help you map the abstractions in an efficient way without losing time.


We would like to thank Pedro, for taking the time to do this interview. It was very interesting to learn how Rust is being used as a primary language to build backend services and how we are learning from all the things we build here and contributing back to the Rust community. We hope you found this interview useful and it gave you some insight into how and where Rust is being used at Facebook. Look out for more interview blogs where we meet with many more engineers and hear their thoughts on this topic.

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About the Meet the Rustaceans series

Rust has consistently been ranked as the “most loved” language for the last 5 years and we at Facebook believe that Rust is an outstanding language that shines in critical issues such as memory safety, performance and reliability and is being used widely over a large range of projects here. We joined the Rust Foundation to help contribute towards the improvement and growth of Rust, which not only strengthens our commitment towards the Rust language but also towards a sustainable development of open source technologies and developer communities across the world.

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This blog is a part of our Meet the Rustaceans series, where we invite the engineers and developers who use Rust on a regular basis to share their experiences and tell us about the amazing products that they are building using Rust here at Facebook. Look out for more interview blogs where we meet with many more engineers and hear their thoughts on this topic.

To learn more about Facebook Open Source, visit our open source site, subscribe to our YouTube channel, or follow us on Twitter and Facebook.

Interested in working with Production Engineering at Facebook? Check out our job postings on our Production Engineering career page here.

Facebook Developers

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Facebook-Meta Earns the ‘Worst Company of 2021’ Title in This Survey

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Facebook has had its share of controversies this year. The company was under more scrutiny after whistleblower Frances Haugen leaked a series of internal documents.

Facebook parent Meta has been named the Worst Company of the Year (2021) by Yahoo Finance respondents. According to the publication, an “open-ended” survey was published on Yahoo Finance on December 4 and 5, where 1,541 respondents participated. Facebook received 8 percent of the write-in vote, but respondents were seemingly mad about the Robinhood trading app as well. Electric truck startup Nikola, which was named last year’s worst company by the same publication also faced respondents ire.

Yahoo Finance notes, “Facebook has had its share of controversies this year.” Starting in January, Meta-owned WhatsApp got caught up in a huge controversy after the messaging app announced a new privacy policy (Terms of Service). WhatsApp said it would collect user information and share it with third-party apps for a better user experience. However, the app gave users no choice but later made modifications to the policy under pressure. Similarly, the company was under more scrutiny after whistleblower and former Facebook employee Frances Haugen leaked a series of internal documents showing the company’s problematic practices. It was revealed that Meta-owned Instagram had a negative impact on teenage girls, but the company did almost nothing to rectify the problem.

Yahoo Finance even highlights, “At the same time, some critics, including conservatives, say Facebook over-policed the platform’s speech and stifled their voices.” Critics also blame Facebook and other social media platforms for not curbing hate speech that led to Capitol Building riots.

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However, around 30 percent of Yahoo Finance readers said that Facebook or Meta could redeem itself. One respondent suggested that the company could issue a formal apology for negligence and donate a sizable amount of its profits to a foundation to help reverse its harm.

On the other hand, respondents chose Microsoft as the Company of the Year (2021). The Satya Nadella-led company touched the trillion-mark this year and introduced notable upgrades. The most notable is the Windows 11 OS update that succeeds Windows 10.

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Facebook pays 1.7 Cr fine to Russia after failing to delete content Moscow deems illegal

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In the latest legal tussle with Russia over controversial social media regulation laws, Facebook paid 17 million roubles (Rs 1.7 Crore) for failing to remove content deemed illegal by Moscow. With a threat of potential larger fines looming, Facebook parent company Meta, owned by Mark Zuckerberg, is scheduled to face court next week over repeated violations of Russian legislation on content, Interfax News Agency reported. As per the latest updates, the social media giant could be fined a percentage of its annual revenue.

In October, Moscow sent state bailiffs to enforce the collection of 17 million roubles. Meanwhile, as per Interfax report citing a federal bailiffs’ database, on Sunday, there were more enforcement proceedings against the company. Apart from the popular social media app, Telegram has also paid 15 million roubles in fines for failing to comply with the Russian social media legislations that came into force in 2016.

Facebook pays $53k to Russia for refusing controversial social media laws

It is pertinent to mention that Facebook has locked horns with Moscow earlier in November, resulting in it paying 4 million roubles ($53,000) over its refusal to adhere to Russian data localisation laws, the Moscow Times reported. The Moscow court on November 25 had said that Facebook paid the fine levied in February, following which all proceedings against the US-based social media giant. The payment comes against the litigation filed against the company in 2018, alongside Twitter. The tech companies were also forced to pay an additional 3000 rubles ($40) for failing to comply with user data sharing rules as per the law. The Russian authorities have also previously blocked LinkedIn, owned by Microsoft, for failing to abide by the laws.

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Russian social media laws

As per Moscow Times, under the Russian social media regulation laws, all foreign technology companies are required to store data related to Russian customers and users on servers located in Russia. Additionally, the Russian tech companies will also have to share encryption data with the federal authorities as well as record user calls, messages and civil society group conversation records. The apparatus is said to be a severe breach of privacy rights and unfettered back-door access to personal data that could be used to harass Kremlin critics.

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Facebook Messenger Is Launching a Split Payments Feature for Users to Quickly Share Expenses

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Facebook Messenger Is Launching a Split Payments Feature for Users to Quickly Share Expenses

Meta has announced the arrival of a new Split Payments feature in Facebook Messenger. This feature, as the name suggests, will let you calculate and split expenses with others right from Facebook Messenger. This feature essentially looks to bring an easier method to share the cost of bills and expenses — for example, splitting a dinner bill with friends. Using this new Split Payment feature, Facebook Messenger users will be able to split bills evenly or modify the contribution for each individual, including their own.

The company took to its blog post to announce the new Split Payment feature in Facebook Messenger. 9to5Mac reports that this new bill splitting feature is still in beta and will be exclusive to US users at first. The rollout will begin early next week. As mentioned, it will help users share the cost of bills, expenses, and payments. This feature is especially useful for those who share an apartment and need to split the monthly rent and other expenses with their mates. It could also come handy at a group dinner with many people.

With Split Payments, users can add the number of people the expense needs to be divided with and, by default, the amount entered will be divided in equal parts. A user can also modify each person’s contribution including their own. To use Split Payments, click the Get Started button in a group chat or the Payments Hub in Messenger. Users can modify the contribution in the Split Payments option and send a notification to all the users who need to make payments. After entering a personalised message and confirming your Facebook Pay details, the request will be sent and viewable in the group chat thread.

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Once someone has made the payment, you can mark their transaction as ‘completed’. The Split Payment feature will automatically take into account your share as well and calculate the amount owed accordingly.


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Tasneem Akolawala is a Senior Reporter for Gadgets 360. Her reporting expertise encompasses smartphones, wearables, apps, social media, and the overall tech industry. She reports out of Mumbai, and also writes about the ups and downs in the Indian telecom sector. Tasneem can be reached on Twitter at @MuteRiot, and leads, tips, and releases can be sent to tasneema@ndtv.com.

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