On Sat, Mar 17, 2012 at 6:27 PM, Waleed Abdulla <[email protected]> wrote: > I thought HRD was supposed to solve the bad neighbor problem. As I read > somewhere (don't have the reference handy right now), when your app issues a > read request, it's sent to multiple datastore replicas in parallel and the > app takes the data from whichever datastore replies first.
I need to re-watch the "more 9s please" video to be sure, but I believe "first reply wins" only works when you are using eventual consistency mode - ie, when issuing a query on an indexed property (always eventual) or doing a get-by-key in Consistency.EVENTUAL mode. If you do a get-by-key in Consistency.STRONG mode (the default), you will still need a quorum. 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.
