Cool Ikai, thanks for clarifying. Robert
On Fri, Jun 24, 2011 at 23:06, Ikai Lan (Google) <[email protected]> wrote: > Robert - the limit should be: > - 10 active asynchronous RPCs. Technically, since the synchronous API just > makes an async call and blocks, I suppose this translates to 10 concurrent > RPCs per request. > - 5 concurrent transaction jobs per datastore instance per request. We are > working on various ways to increase this limit, such as parallel > transactions to multiple datastore instances. Is my explanation confusing? > To answer the question about read latency - yes, the read latency should be > the same. However, get by key is done inside a transaction unless you set > "eventually consistent queries" to true. The reason it needs to be done > inside a transaction is because we need to be sure the data you are reading > is the freshest data. Fresh = data written that passes milestone A: > http://code.google.com/appengine/articles/transaction_isolation.html > Ikai Lan > Developer Programs Engineer, Google App Engine > Blog: http://googleappengine.blogspot.com > Twitter: http://twitter.com/app_engine > Reddit: http://www.reddit.com/r/appengine > > > On Sat, Jun 25, 2011 at 6:48 AM, Branko Vukelic <[email protected]> wrote: >> >> On Fri, Jun 24, 2011 at 11:39 PM, Casey Dwyer <[email protected]> >> wrote: >> > IIRC, in one of the I/O talks ("More 9s Please" I believe), they said >> > that >> > read latency is about the same and write latency is high in HRD. Did I >> > hear >> > that incorrectly? >> >> That's exactly correct. >> >> >> http://www.youtube.com/watch?v=xO015C3R6dw&feature=player_detailpage#t=795s >> >> Just below that, though, the error rate is supposedly much lower for >> HRD compared to MS. That's what's meant by "more 9s". >> >> -- >> Branko Vukelić >> [email protected] >> >> Lead Developer >> Herd Hound (tm) - Travel that doesn't bite >> www.herdhound.com >> >> -- >> 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.
