I'm going to let someone else answer this question, but we are recommending that all new applications use High Replication datastore. Datastore latency spikes are virtually non-existent if your application uses HR instead of master-slave.
-- Ikai Lan Developer Programs Engineer, Google App Engine Blogger: http://googleappengine.blogspot.com Reddit: http://www.reddit.com/r/appengine Twitter: http://twitter.com/app_engine On Sat, Jan 29, 2011 at 10:25 PM, Natalie <[email protected]>wrote: > Hello, > > We are at the planning phase on a new App Engine project, and we are > unsure about the choice of Master/Slave and High Replication. > > About our site: > The site is expected to get a lot of hit (Around 50-200 QPS.). > Around 20% write and 80% read. > Minimal outrage a must. Will lose a lot of clients if outrages are too > frequent. > > We would love to hear from fellow App Engine developers of their > experiences with HR. > > In particular we want to know: > 1) Recently the M/S datastore has very high latency for query. How’s > your experience in HR? > 2) What’s your approximate of the HR datastore availability? Is it > close to 99.9%? > 3) How is the read/write performance of HR datastore? Would love it if > you could share some statistics. > 4) How much does the cross datacenter synchronization issue affect the > performance of your site? Please see this link about the issue: > > http://groups.google.com/group/google-appengine/browse_thread/thread/5fc3b6a4366de62f/4b4d23e924b7b136 > > It would be great if you could share your experience with us and other > App Engine developers. > > Thank you very much. > > -- > 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]<google-appengine%[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.
