I am a senior student, this is my project topic,
Project description:
Cloudfoundry system currently does not provide a smooth upgrade function of application software, user application software upgrade, cloudfoundry system will force to stop the currently running application examples, and then running the new version of the application, for the high availability requirements of the application, the current mode of application upgrade obviously cannot meet the practical requirements, smooth, so it is necessary to determine the application software upgrade plan and complete the related development work,

I've tried this method before http://my.oschina.net/lax/blog/102791, our teacher said this method doesn't work, will be lost when unmap session, cache (big website login state, etc), and other information, now my problem is one way to avoid missing this information, how to design?

Note: we use the v2 version