Facebook has confirmed that its biggest ever outage happened due to changes in its database clusters and was attributed to a flaw in its database software system.
“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." wrote Robert Johnson, director of software engineering division at Facebook in a post on the company’s blog.
The flaw prevented users from accessing the website as one fault in database clusters triggered a chain of events, making website administrators turn off the automatic configuration system to prevent further damage.
Outages at Facebook are rare in comparison to micro blogging platform Twitter, one which suffered major disruptions until it was upgraded early this year.
Facebook became inaccessible at 1:30 pm EDT on September 24 till 4 pm same time zone, resulting the worst network outage Facebook suffered ever since its inception.