Yes, you are right. Infact I was wondering the same too. They also make sure their systems are resilient by testing out scenarios as simple as one instance goin

Yes, you are right. Infact I was wondering the same too. They also make sure their systems are resilient by testing out scenarios as simple as one instance going down [1] to a whole data center going down [2] and yet this happens. I guess we have to wait till the post-mortem report comes in on this. [1]- http://techblog.netflix.com/2012/07/chaos-monkey-released-into-wild.html http://techblog.netflix.com/2012/07/chaos-monkey-released-in... [2]- http://techblog.netflix.com/2011/07/netflix-simian-army.html http://techblog.netflix.com/2011/07/netflix-simian-army.html