Prática de Shadowing: Github are you joking? - Aprenda a falar inglês com o YouTube
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GitHub just had its magnum opus of a bug.
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GitHub just had its magnum opus of a bug.
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Now, I've heard lore that people have dropped databases,
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just some showstopper bugs, but I did not think it was possible for GitHub to cease being Git.
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Now, we're gonna go through what actually happened,
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but more so, I just have a lot of questions as to how this was even possible.
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All right, so before we begin about GitHub ceasing to be Git,
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let's first go over a bit of lore because it's important.
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In 2005, the creator of Linux decided that he was going to take the Brendan Eich challenge,
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which is to create a programming language in seven days,
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but instead create version control in 10.
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And thus, Git was born.
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Upon seeing this beautiful distributed version control,
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software developers did the only thing that made sense,
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immediately create a single point of failure.
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GitHub became so popular that other services decided to use the hub naming convention.
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Of course, the most popular being Docker Hub,
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where you can store all your dockers at.
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Microsoft, seeing that GitHub attracted developers,
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developers, developers, decided to purchase GitHub for $7.5 billion and proceeded to generationally fumble the bag.
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Microsoft, you could have done like nothing.
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Like if you would have just left GitHub,
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it would have operated better than whatever has happened today.
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But the impressive part is that Microsoft has discovered the fourth E in the triple E strategy of course,
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which is embrace, extend, extinguish, and shitify.
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Yesterday, we had a regression in the merge queue behavior where,
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in some cases, squash or rebase commits were generated from the wrong base state,
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making earlier changes appear reverted in branch history.
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You had one job, just one singular job,
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GitHub, which is of course to be git.
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Now that's only about half the story because it really isn't kind of actually illustrating what happened.
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Now, here's a better story.
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On April 23rd, GitHub's merge queue started silently reverting code on customers' main branches.
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Now, reverting is actually a Git operation.
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It did not revert code.
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That's very important to understand.
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Not a handful of lines, in some cases, thousands.
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Nothing looked wrong.
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A PR with a plus 29 minus 34 diff got reviewed, approved, and queued.
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What actually landed on main was a single commit with plus 245 minus 1137.
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Thousands of lines of unrelated already shipped code were quietly removed.
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Every merge that followed went in on top of that broken history.
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That means that you would look at the PR.
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Your PR would actually look correct.
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And when you hit the merge button,
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what actually went in was not what you hit merge on.
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This is absolutely diabolical behavior.
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I mean, to be lied to,
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like the UI just telling you, nah, everything's good, man.
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This is exactly what's going to happen.
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And for you to have no idea is crazy.
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I still have a lot of questions,
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but this is roughly how it's being reported.
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Now, we do not have the official GitHub kind of postmortem that explains exactly what went wrong.
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This is just what is being purported by large companies.
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Effectively, what happens is you have history that looks like this in Git,
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and this would be your main branch.
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So let's just say you have four commits on your main branch.
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And for whatever reason, you branched off back here to make your new branch,
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and then you've added two commits.
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So the actual root cause of what would happen is that when you'd go to merge,
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what would end up happening is they would run something called a merge queue,
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which would take your two merges,
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which if you just drew this in a straight line would be three circles,
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because you'd have where you branch from and your two changes.
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And it would squash these two into a singular change.
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So they are just one single branch.
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This is actually a whole new branch that's created internally in one of Microsoft's CI.
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Let's just call this singular squashed merge A.
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What should happen is that A should be merged to the tip of main.
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But what actually ended up happening is
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that they would take this history right here and overwrite whatever was on main with this right here.
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So that means if this thing was called B,
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that means what would be on main now would simply be B to A.
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And that is it.
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That means these three commits were just gone.
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Now, this obviously caused teams to scramble all afternoon.
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There are hundreds of tweets of people saying,
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hey, I had to spend all afternoon
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or multiple days trying to figure out how to detangle whatever has happened
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and what is actually missing from all of their PRs.
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GitHub, of course, has said there's only 2,804 pull requests that were messed up out of 4 million merged.
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Then later on said there was only 800K PRs either way.
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That's the difference between 0.07% and 0.3 plus percent.
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It's a big difference.
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So which one is it, GitHub?
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And obviously even more confusing thing,
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if you go to April 23rd, that's weird.
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I don't, do you see like some major outage or a partial outage going up there?
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No, they don't show anything went wrong on the 23rd.
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Obviously the reason for that is that the only downtime was you
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and your team trying to figure out how to undo what just happened.
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But I also just have a lot of questions and maybe you guys can help me on this one.
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So the first thing I have is that if this is B
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and this is A and this is the temporary branch that we have created,
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if history looked like this,
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wouldn't pulling down cause you to have some sort of,
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hey, the remote branch is like out of sync with your local branch,
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meaning your two histories have diverged.
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You wouldn't even be able to pull down main anymore.
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Or the other option is that instead of just simply putting A right here,
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it actually had revert commits,
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meaning that it would have these three commits right here,
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and then it would have another commit that was like,
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hey, I'm reverting these three commits right here,
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and then you would have something like A,
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which would make this not too difficult to be able to go,
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okay, well, here's the only revert we have,
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unreverted, which is not like how anything sounds like.
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But even more importantly, Git is still Git.
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You cannot change history like this easily.
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Does that mean internally is Microsoft like pushing with force, right?
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Because the only way that you could push this right here,
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this history onto main would be that you have to force push because you're changing history.
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And if that's the case,
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if that's the case that they're force pushing,
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makes me kind of nervous.
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Like what other issues are there?
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What other things have been silently happening?
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And of course this, there's no shot it was 2,804 total.
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Please double check this stat.
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We probably had 200 plus as a single customer.
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So I'm actually just pretty curious.
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Did you lose any commits?
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Are you using the kind of the auto squash feature and thus you have things gone?
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Also, this has opened up the most legendary excuse of all time for the next year.
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When any company gets hacked and stuff gets leaked or something goes horribly wrong,
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they can go, oh yeah,
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well, actually we actually did implement perfect security.
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We actually had this exact situation already covered,
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but GitHub decided to silently drop our commit.
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Brother, it's not our fault, it's GitHub's.
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It's also funny because there's probably a bunch of vibe coders
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that they just simply just kept on going on with their day.
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Some weird thing happened and they're getting,
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they're just like, oh, fix it,
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oh, AI, just fix it.
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And then when a bug appeared,
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they're like, stupid AI, always reverting previous changes.
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Hey, fix that one now again.
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You know that happened.
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Absolutely beautiful.
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And the worst part is for once, it actually wasn't AI.
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They're just gonna be blamed for part of this for a whole group of people.
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Actually, I mean, to be fair,
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it could have been AI.
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It could, hey, it could have been.
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There's some reports going around that it was a faulty feature flag.
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Of course, Hacker News had its heyday and people were viciously discussing what happened to GitHub.
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Four people spent hours putting a repo back together at my company after this.
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GitHub has been unreliable and now they are breaking core tenant of what I expect from this service.
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Core tenant?
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You mean tenant, not tenant.
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You must be fun at parties.
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I don't care to associate with people who are offended by being corrected.
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They can sod off and I never go to what you Americans call parties.
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Whenever you use quotes and they are directly followed by punctuation,
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you must include the punctuation within the quotes, parties, period.
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Reply, don't you love Hacker News?
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It's just such a lovely place where you see really thoughtful and amazing discussions about topics.
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But at the end of the day,
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we still do not have the exact post-mortem,
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so we don't know the exact cause or reasoning,
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or will GitHub even provide us with the exact details?
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I don't know.
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So if anybody can answer these questions,
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does Microsoft actually use a force underneath the hood to be able to align histories?
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Were there revert commits, which I don't think there was because nobody is saying that on the internet,
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wouldn't this cause all sorts of history being absolutely destroyed?
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Wouldn't this be kind of easy to be able to kind of resolve?
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Maybe, yeah, it would take a little bit of time.
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Maybe you have to ask Claude Opus for,
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you know, mythos to be able to resolve it,
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but you should be able to get this done pretty quick.
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And really, was it only 2,800 PRs?
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Is that it?
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I mean, Mr. 200 over there doesn't seem to make that to be the case.
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The name is that I think the most impressive thing out of all of this is
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that GitHub created such a monumentously good name that even after GitHub ceased to be Git for a little bit,
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everybody's probably still going to keep on using it.
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I mean, now that, my friends,
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is one of the most impressive products of all time.
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At this point, it seems like GitHub is more addictive than cigarettes.
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A jet.
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Hey, is that HTTP?
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Get that out of here.
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That's not how we order coffee.
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We order coffee via sshterminal.shop.
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Yeah, you want a real experience?
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You want real coffee?
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You want awesome subscriptions so you never have to remember again?
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Oh, you want exclusive blends with exclusive coffee and exclusive content,
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then check out Kron.
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You don't know what SSH is?
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Well, maybe the coffee is not for you.
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Vocabulário e Frases Principais
- Magnum opus: obra-prima, usado para descrever algo de grande importância.
- Bug: erro em um sistema ou programa, algo que causa falhas.
- Version control: controle de versão, importante para gerenciar alterações em softwares.
- Merge queue: fila de mesclagem, onde códigos são combinados.
- PR (Pull Request): solicitação de alteração em um repositório de código.
- Reverting: operação que reverte mudanças anteriores.
- Commit: salvar alterações em um repositório de código.
- Commits gerados: referências às alterações feitas que precisam ser tratadas.
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