Andrey Satarin

For quite some time I've been putting together a list of resources on testing distributed systems asatarin.github.io/testing-distri…

Great recent find “Epic: The Musical”., based on The Odyssey. Gods, monsters, magic, love, death, betrayal, revenge, drama. It has It all. **So quotable**. music.youtube.com/playlist?list=…

@relizarov For me, Demerzel / Empire story continues to be more interesting since Season 2. And only partially because it's not spoiled by the original book trilogy.

Watching Foundation S3. Remembered the key plot twist about the Mule from the book. It really spoils the fun, but I’m still curious whether it is going to happen in this season or later.

Moore’s law still applies in the sense that the number of transistors in our processors increases exponentially. What broke around 2005 is Dennard scaling. Our clock frequencies are no longer increasing. But you don’t want to buy a processor from 2005: it is going to be much slower. Bandwidth and storage are increasing all around. Our compute throughput is not stagnating. Don’t let anyone tell you otherwise.

@tagir_valeev Oldie but goodie. Старый ютуб, такого больше не выпускают.

А вот оригинальная песня Large Hadron Rap, записанная в ЦЕРНе научной журналисткой Katherine McAlpine незадолго до запуска Большого адронного коллайдера. В ней подробно рассказана научная программа этой экспериментальной установки от бозона Хиггса до чёрных дыр и скрытых измерений пространства. Twenty seven kilometers of tunnel underground, designed with mind to send protons around. A circle that crosses through Switzerland and France, Sixty nations contribute to scientific advance. youtube.com/watch?v=j50Zss…

Когда я не слушаю детские песни, я слушаю песни про науку. Иногда это пародии, иногда оригинальные творения. Меня прямо мурашит, когда классные научные термины удачно вплетают в текст песни и с чем-нибудь рифмуют. Давайте покажу вам несколько любимых произведений.

@tagir_valeev Rolling in the Higgs. Но весь A Capella Science очень крутой youtu.be/VtItBX1l1VY

Делитесь своими любимыми песнями про науку :-)

Kyle Kingsbury Jepsen’ed TigerBeetle jepsen.io/analyses/tiger…

@eatonphil Most certainly, since clients are expected to retry as well. The trick is to make it invisible to test authors.

I'm talking about integration/e2e tests but all on one machine. Give me your thoughts. Tell me your stories.

Retry logic in tests

@nikitabase @databricks @neondatabase Congratulations to you and the team. Excited to see what comes out of this.

I’m excited to share a major milestone: Neon is joining forces with @databricks. neon.tech/blog/neon-and-… Together, we will build the best Postgres experience in the world and one of the most important pieces of the modern AI-native stack. Day 1 again for @neondatabase

I designed Dropbox's storage system and modeled its durability. Durability numbers (11 9's etc) are meaningless because competent providers don't lose data because of disk failures, they lose data because of bugs and operator error. Yes S3 has lost data. No it wasn't because some disks failed. If you're building your own infrastructure you should heavily invest in release process and validation testing (link in reply). You're not going to do a better job than a major cloud provider though. The best thing you can do for your own durability is to choose a competent provider and then ensure you don't accidentally delete or corrupt own data on it: 1. Ideally never mutate an object in S3, add a new version instead. 2. Never live-delete any data. Mark it for deletion and then use a lifecycle policy to clean it up after a week. This way you have time to react to a bug in your own stack.

@jamesacowling @eatonphil The code I can use internally without talking to a company lawyer.

Once upon a time there was "free software" (FSF) and "open source" (OSI), although the former doesn't get talked about much these days. I think when most devs say they like "open source" they just mean they want to have the code and use it, and are perfectly happy with BSL or FSL even though those don't meet the strict definition.

what even is open source

@eatonphil x.com/PierreZ/status…

What companies and individuals beyond the obvious few write about deterministic simulation testing (or similar things by other names)? Asking for a friend

@eatonphil x.com/PierreZ/status…

Testing Distributed Systems asatarin.github.io/testing-distri…

@dbg_nsk Лучи поддержки. Конференции — это тяжело.

Как же я выжат после сноувана и сисконфа, просто жесть. Вот эта неделя просто шутка какая-то, я реально ничего не могу. Кажись таки мобилизовал все, что было, чтобы их хорошо провести. Пум-пурум.

@nearyd @danluu The attending was just being lazy. I'm sure conference website had your bio with socials and they could have satisfied their curiosity in more depth and less time when you ever could in your introduction.

@danluu I once had a talk attendee come up to me after a talk and tell me that I should have introduced myself, beyond "Hi, my name is $X, I work for $Y, and today we're going to talk about $Z." Apparently this attendee felt that I should establish credibility first.

Really good post on writing/blogging advice for developers by @deliberatecoder: refactoringenglish.com/chapters/write… It's full of concrete, actionable, advice. The other sample chapters from his book also look good (refactoringenglish.com/chapters/rules…, refactoringenglish.com/chapters/commi…)

@eatonphil You might enjoy #bardcore version of Pink Pony Club as well youtu.be/V7jOobdrdGo

a capella renditions of pink pony club on repeat

@wangbin579 Depends on the workload and read committed implementation. For vanilla MySQL AFAIR single statement query will be about the same due to implementation details.

In terms of performance, do you think Read Committed performs better than Repeatable Read? Based on my observations, most people don’t truly understand this, even though they’ve taken database courses.

@jorandirkgreef > test this? Shots fired

Towards the D in ACID, how many DBMSs: - fsync() on commit - fsync() on opening the WAL - daisy chain checksums (cf. misdirected I/O) - open the WAL with O_DIRECT (cf. fsyncgate) - have 2 WALs (cf. Protocol-Aware Recovery) - don't trust the inode to get WAL size - test this?

@eatonphil @AlexMillerDB Distributed systems reading group led by @AlekseyCharapko

Help me build a list of online tech book clubs and online paper reading groups? Comment with what your group does and how someone can join? RT for reach.

More on: - reusing corpora of tests from existing systems - metamorphic tests with SQLancer - verifying control plan with fault injection and fuzzing Added to the list #feldera" target="_blank" rel="nofollow noopener">asatarin.github.io/testing-distri…

"Correctness at Feldera" talks about various correctness techniques, including: - machine proof of the underlying DBSP algorithm - differential testing of the implementation feldera.com/blog/correctne…