Hi Julian, Long running user facing requests are bad for the ecosystem, yes. Long running background tasks, however, can be placed into a different execution pool. Fast background tasks are placed into the same execution pool as your web facing requests.
The rule of thumb here is to create different queues for tasks you know will run fast (sub-second) and queues for slow running jobs. -- 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 Thu, Nov 18, 2010 at 11:52 PM, Julian Namaro <namarojul...@gmail.com>wrote: > Wow a lot of work packed there, congrats App Engine team! > > I'm surprised about the new 10 minutes deadline on Cron and Task > Queues. A short while back you were explaining that long-running > requests are bad for the App Engine ecosystem. Is it not the case for > Task Queues or are you just confident that the system has improved > enough to handle it now ? > > 10 minutes is a lot of time. If it works out well it will open the > door to a lot of new possibilities :) > > > On Nov 19, 7:27 am, "Ikai Lan (Google)" > <ikai.l+gro...@google.com<ikai.l%2bgro...@google.com> > > > wrote: > > Hey everyone, > > > > I just wanted to let everyone know that prerelease SDK 1.4.0 is out! Get > it > > from the Google Code project: > > > > http://code.google.com/p/googleappengine/downloads/list > > > > We're still working on the docs and will have them ready for the final > > release, so if there are any questions about how to use the new features, > > feel free to ask on this thread and I'll do my best to clarify them. The > > release notes are below. This is an EXCITING release: > > > > Python > > ------------ > > - The Always On feature allows applications to pay and keep 3 instances > of > > their > > application always running, which can significantly reduce application > > latency. > > - Developers can now enable Warmup Requests. By specifying a handler in > an > > app's app.yaml, App Engine will attempt to to send a Warmup Request to > > initialize new instances before a user interacts with it. This can > reduce > > the > > latency an end-user sees for initializing your application. > > - The Channel API is now available for all users. > > - Task Queue has been officially released, and is no longer an > experimental > > feature. The API import paths that use 'labs' have been deprecated. > Task > > queue > > storage will count towards an application's overall storage quota, and > > will > > thus be charged for. > > - The deadline for Task Queue and Cron requests has been raised to 10 > > minutes. > > Datastore and API deadlines within those requests remain unchanged. > > - For the Task Queue, developers can specify task retry_parameters in > their > > queue.yaml. > > - Metadata Queries on the datastore for datastore kinds, namespaces, and > > entity > > properties are available. > > - URLFetch allowed response size has been increased, up to 32 MB. Request > > size > > is still limited to 1 MB. > > - The Admin Console Blacklist page lists the top blacklist rejected > > visitors. > > - The automatic image thumbnailing service supports arbitrary crop sizes > up > > to > > 1600px. > > - Overall average instance latency in the Admin Console is now a weighted > > average over QPS per instance. > > - The developer who uploaded an app version can download that version's > code > > using the appcfg.py download_app command. This feature can be disabled > on > > a per application basis in the admin console, under the 'Permissions' > tab. > > Once disabled, code download for the application CANNOT be re-enabled. > > - Fixed an issue where custom Admin Console pages did not work for Google > > Apps for your Domain users. > > - Allow Django initialization to be moved to appengine_config.py to avoid > > Django version conflicts when mixing webapp.template with pure Django. > > http://code.google.com/p/googleappengine/issues/detail?id=1758 > > - Fixed an issue in the dev_appserver where get_serving_url did not work > > for transparent, cropped PNGs: > > http://code.google.com/p/googleappengine/issues/detail?id=3887 > > - Fixed an issue with the DatastoreFileStub. > > http://code.google.com/p/googleappengine/issues/detail?id=3895 > > > > Java > > --------- > > - The Always On feature allows applications to pay and keep 3 instances > of > > their > > application always running, which can significantly reduce application > > latency. > > - Developers can now enable Warmup Requests. By specifying a handler in > an > > app's appengine-web.xml, App Engine will attempt to to send a Warmup > > Request > > to initialize new instances before a user interacts with it. This can > > reduce > > the latency an end-user sees for initializing your application. > > - The Channel API is now available for all users. > > - Task Queue has been officially released, and is no longer an > experimental > > feature. The API import paths that use 'labs' have been deprecated. > Task > > queue > > storage will count towards an application's overall storage quota, and > > will > > thus be charged for. > > - The deadline for Task Queue and Cron requests has been raised to 10 > > minutes. > > Datastore and API deadlines within those requests remain unchanged. > > - For the Task Queue, developers can specify task retry-parameters in > their > > queue.xml. > > - Metadata Queries on the datastore for datastore kinds, namespaces, and > > entity > > properties are available. > > - URL Fetch allowed response size has been increased, up to 32 MB. > Request > > size > > is still limited to 1 MB. > > - The Admin Console Blacklist page lists the top blacklist rejected > > visitors. > > - The automatic image thumbnailing service supports arbitrary crop sizes > up > > to > > 1600px. > > - Overall average instance latency in the Admin Console is now a weighted > > average over QPS per instance. > > - Added a low-level AysncDatastoreService for making calls to the > datastore > > asynchronously. > > - Added a getBodyAsBytes() method to QueueStateInfo.TaskStateInfo, this > > returns > > the body of the task state as a pure byte-string. > > - The whitelist has been updated to include all classes from > javax.xml.soap. > > - Fixed an issue sending email to multiple recipients. > > http://code.google.com/p/googleappengine/issues/detail?id=1623 > > > > As usual, we value your feedback, so don't hesitate to evaluate these > SDKs > > and let us know. Be mindful that the server-side components have not been > > deployed yet, so uploaded code shouldn't work. > > > > Happy coding! > > > > -- > > 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 > > -- > 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-appeng...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine+unsubscr...@googlegroups.com<google-appengine%2bunsubscr...@googlegroups.com> > . > 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 google-appeng...@googlegroups.com. 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