YouTube was down today from approximately 7AM to 1PM. There's really no enticing story to tell here, we weren't hacked and we weren't pushing new features. Simply put, our primary database crashed. We did make a very intentional decision to not immediately fail over to our redundant database but to instead bring up both databases simultaneously to ensure we had absolutely no data loss. Although we may have lengthened the time of our outage to do this, our number one priority was to not compromise our users' content in any way.
Our sincere apologies for any inconvenience the outage may have caused you. We can confidently say that the site is now completely restored and that we're working around the clock (literally, just ask our ops team) to ensure that this sort of thing does not happen in the future.
We will be taking a planned downtime this Thursday night to address some of the issues from today's outage as well push out some new features, so check back here in a few days for a more exciting update.
MaryroseThe YouTube Team