It's completely undocumented (at this stage, anyway), but definitely seems to work. A few notes I've come gathered:
- CPU time quota appears to be calculated based on literal time, rather than e.g. the UNIX concept of "time spent in running state". - I can fetch 100 URLs in 1.3 seconds from a machine colocated in Germany using the asynchronous API. I can't begin to imagine how slow (and therefore expensive in monetary terms) this would be using the standard API. - The user-specified callback function appears to be invoked in a separate thread; the RPC isn't "complete" until this callback completes. The callback thread is still subject to the request deadline. - It's a standard interface, and seems to have no parallel restrictions at least for urlfetch and Datastore. However, I imagine that it's possible restrictions may be placed here at some later stage, since you can burn a whole lot more AppEngine CPU more cheaply using the async api. - It's "standard" only insomuch as you have to fiddle with AppEngine-internal protocolbuffer definitions for each service type. This mostly means copy-pasting the standard sync call code from the SDK, and hacking it to use pubsubhubub's proxy code. Per the last point, you might be better waiting for an officially sanctioned API for doing this, albeit I doubt the protocolbuffer definitions change all that often. Thanks for Brett Slatkin & co. for doing the digging required to get the async stuff working! :) David. 2009/3/16 peterk <peter.ke...@gmail.com>: > > Very neat.. Thank you. > > Just to clarify, can we use this for all API calls? Datastore too? I > didn't look very closely at the async proxy in pubsubhubub.. > > Asynchronous calls available on all apis might give a lot to chew > on.. :) It's been a while since I've worked with async function calls > or threading, might have to dig up some old notes to see where I could > extract gains from it in my app. Some common cases might be worth the > community documenting for all to benefit from, too. > > On Mar 16, 1:26 pm, David Wilson <d...@botanicus.net> wrote: >> I've created a Google Code project to contain some batch utilities I'm >> working on, based on async_apiproxy.py from pubsubhubbub[0]. The >> project currently contains just a modified async_apiproxy.py that >> doesn't require dummy google3 modules on the local machine, and a >> megafetch.py, for batch-fetching URLs. >> >> http://code.google.com/p/appengine-async-tools/ >> >> David >> >> [0]http://code.google.com/p/pubsubhubbub/source/browse/trunk/hub/async_a... >> >> -- >> It is better to be wrong than to be vague. >> — Freeman Dyson > > > -- It is better to be wrong than to be vague. — Freeman Dyson --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
