(I swear I didn't pay Robert to ask this question) The High Replication Datastore can loose multiple data centers and still function (without any data-loss, down time or elevated error rates). It is also not dependent on a single geographical region. Of course the availability of an App Engine application is dependent on the entire App Engine stack (not just the datastore) so if a problem affects other parts of the stack there might be a short period of user visible issues (likely just the time it takes to realize there is a problem, which is typically pretty short).
Matt and I will be talking about how this works in detail in the Google IO session: "More 9s Please: Under The Covers of the High Replication Datastore" - Alfred On Apr 21, 10:33 pm, Robert Kluin <[email protected]> wrote: > Hopefully they can get everything sorted out soon. > > Depends on your app, but having a bit of downtime sprinkled across the > year in small doses is probably easier to handle than a massive outage > that shuts down a site for a day. > > Any chance a Googler could comment about how well distributed and > independent the HR datacenters are? Would HR apps still be up if the > state (or maybe the western half of the US) holding the primary HR > datacenter suddenly lost all power and connectivity? > > Robert > > > > > > > > On Fri, Apr 22, 2011 at 08:09, saidimu apale <[email protected]> wrote: > > FWIW, here's DotCloud's take on the outage which is still affecting them: > >http://blog.dotcloud.com/working-around-the-ec2-outage > > > saidimu > > > On Thu, Apr 21, 2011 at 6:12 PM, Jeff Schnitzer <[email protected]> wrote: > > >> On Thu, Apr 21, 2011 at 1:58 PM, saidimu apale <[email protected]> wrote: > > >> > It sure helps that you have a batphone to the GAE datastore team. Or is > >> > that > >> > a different Jeff Schnitzer? > > >> Don't interpret that too literally. A couple of the Google developers > >> have been receptive to some api changes that would make Objectify work > >> better (Future interception, and a way to expose entity version > >> timestamps) but my apps run on the same hardware yours does. When I > >> have production questions, I post them here. > > >> Jeff > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Google App Engine" group. > >> To post to this group, send email to [email protected]. > >> To unsubscribe from this group, send email to > >> [email protected]. > >> For more options, visit this group at > >>http://groups.google.com/group/google-appengine?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google App Engine" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group at > >http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
