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Facebook outage 

Deleted Reddit comments from a user who claimed to be a Facebook employee on the team trying to fix the outage

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Facebook outage 

Gosh, it really would be a fuckup if their badge security system itself depends on Facebook

Facebook outage 

Circular dependencies in software can be a real problem, especially since many tech companies follow the approach of "eating your own dogfood".

I don't know if that's the main cause of this outage but it certainly seems like it's at least seriously hindering the recovery efforts

Facebook outage 

It's really easy to fall into the trap of having a circular dependency without intending to, or realising you've done so.

All you need are two things X and Y (could be tools, services, etc.) and you decide that it's "best practice" to use both of them. So X adds a dependency on Y, Y on X, and of course everyone else is depending on both

Facebook outage 

The insidious part is that it works fine - until it doesn't. As long as both are at least partially working you can usually recover. But as soon as one goes down it becomes very difficult to bring either back

And even if you think X has no dependency on Y, maybe it does have a dependency on Z, and you don't know *it* depends on Y.

Facebook outage 

The usual solution is to bootstrap from simpler tools and self-contained systems without dependencies but that of course has its own issues.

Like maybe you take the time to set up your emergency fallback and think you're covered, but then a year later you find it's bitrotted and doesn't work any more

re: Facebook outage 

@fraggle

This kinda reminds me of an article I’ve read a few years ago.

An insurance company (I’m not sure if from the UK or the US) which faked a fire alert and for all people who were laid off the access cards didn’t work anymore.

re: Facebook outage 

@domodak @fraggle aren't access cards supposed to be only required to enter, but not to exit?

re: Facebook outage 

@wolf480pl @fraggle

The laid-off employees were lured outside (together with their still employed co-workers) and couldn’t enter the building again.

re: Facebook outage 

@domodak @fraggle why were they inside in the first place? Some kind of protest?

re: Facebook outage 

@wolf480pl @fraggle

I don’t know. It was just mentioned in an aside.

:shrug_riko:

Facebook outage 

@fraggle I thought eating your own dog-food was supposed to be a *good* thing!

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