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Facebook Is DOWN today

Facebook Is DOWN today

Facebook is down for everybody.

Here is the post posted by Facebook.

Early today Facebook was down or unreachable for many of you for approximately 1.5 hours. Corona Virus Outrage now Facebook. This is the worst outage we’ve had in over four years, and we wanted to, first of all, apologize for it. We also wanted to provide much more technical detail on what happened and share one big lesson learned.

The key flaw that caused this outage to be so severe was an unfortunate handling of an error condition. An automated system for verifying configuration values ended up causing much more damage than it fixed.

The intent of the automated system is to check for configuration values that are invalid in the cache and replace them with updated values from the persistent store. This works well for a transient problem with the cache, but it doesn’t work when the persistent store is invalid.

Today we made a change to the persistent copy of a configuration value that was interpreted as invalid. This meant that every single client saw the invalid value and attempted to fix it. Because the fix involves making a query to a cluster of databases, that cluster was quickly overwhelmed by hundreds of thousands of queries a second.

To make matters worse, every time a client got an error attempting to query one of the databases it interpreted it as an invalid value, and deleted the corresponding cache key. This meant that even after the original problem had been fixed, the stream of queries continued. As long as the databases failed to service some of the requests, they were causing even more requests to themselves. We had entered a feedback loop that didn’t allow the databases to recover.

Is Facebook is Down now?

Yes. Facebook is facing some global outage issues. Users are not able to access Facebook from their mobile and laptops or PCS.

Here are Some tweets of Users those who reported facebook down

Facebook-down-twitter
Facebook down on twitter
Facebook is down
Facebooks down posts on twitter
Facebook down hash tag
Facebook-down-twitter-messages

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