On Wed, Dec 7, 2011 at 10:44 AM, Andrius A <[email protected]> wrote: > In docs it says that HRD is more costly "The High Replication Datastore > costs more due to the additional replication (see billing page for pricing > details). Due to the higher cost, we recommend High Replication Datastore > primarily for those developers building critical App Engine applications > that require the highest availability".
I've filed a bug against this documentation. > It also says "queries on a single guestbook to be strongly consistent, but > also limits changes to the guestbook to 1 write per second (the supported > limit for entity groups). Therefore, writing to a single entity group per > guestbook is not ideal when high usage is expected. If your app is likely to > encounter heavy write usage, consider using another means. For example, you > can put recent posts in memcache with an expiration, and then display a mix > of recent posts from memcache and posts retrieved from the datastore." > How could we trust by putting data to memcache if we know it can be evicted > any time? You wouldn't as definitive storage but it is reasonable to cache recent posts there. > To use HRD is not viable for applications which need strong > consistency for high rate of puts. You may have to think about how your organize your data in order to satisfy your consistency and throughput requirements but I am very skeptical when you say that it is simply not viable. Google, for example, has been successful using the same technology for many of its own high-volume properties. > At the moment MS is perfect what it does > but bloody thing keeps dying.. That is an architectural problem that is very hard to fix with making the same kinds of trade-offs that we made when implementing HRD . Cheers, Brian > I can't believe there is no way to improve MS > and you are switching to HRD. In long term HRD can cause more problems for > applications parts were it wasn't aticipating to receive higher rate of > inserts, and having a limit of 1 write per second is a disastrous. > > > On 6 December 2011 23:29, Gregory D'alesandre <[email protected]> wrote: >> >> Hi Kenneth, >> >> We are planning to add blobstore migration at some point but it won't >> likely be until the middle of Q1 at the earliest. >> >> Greg >> >> >> On Tue, Dec 6, 2011 at 3:27 PM, Kenneth <[email protected]> >> wrote: >>> >>> Hi Greg, >>> >>> Can you give us some indication if the migration tool is ever going to >>> include blobstore migration? That's the only thing holding me back. I know I >>> can do it myself but I'd rather not. I see now that it has gone ga, have you >>> stuck a fork in it and called it done? >>> >>> Thanks >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Google App Engine" group. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msg/google-appengine/-/f7KzNP-pCuwJ. >>> 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. -- 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.
