Google released the App Engine SDK version 1.4.0, that include a number of new features:
- Always On is a premium feature costing $9 per month which reserves three instances of your app, never turning them off, even if the app has no traffic. This mitigates the impact of loading requests on apps that've small or variable amounts of traffic.
- Warm Up Requests reduces time to serve requests by anticipating the need for more instances and loading them before user traffic is sent to new instance. It can be enabled for all apps through app.yaml or appengine-web.xml and is enabled by default for apps with "Always On".
Here're some reduced or removed limitations:
Download: App Engine SDK