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    <p>For app engine you will want a lightweight framework, both for persistance and application stuff. Google is changing their pricing model so you might want to consider how this will impact your plans as well. There is an interesting discussion on the app engine group about this: <a href="https://groups.google.com/forum/#!topic/google-appengine/ob-kMuDAAqc/discussion" rel="nofollow">https://groups.google.com/forum/#!topic/google-appengine/ob-kMuDAAqc/discussion</a></p> <p>Aside from that I can only comment on the choice of <strong>persistance framework</strong>:</p> <p><strong>JDO</strong> on app engine is a pain. The version they (Google) support in app engine is 1.x, which is ancient, I believe. I have had more trouble with getting things to work than I care to remember. <strong>If you have previous experience with JDO this still might be a good choice.</strong> If I were to start over again I would choose a persistence framework that was specifically written for app engine, like <strong>objectify</strong> or <strong>twig</strong>. They require less overhead and are easier to use (from my point of view). One <strong>giant</strong> plus of objectify: gives you <strong>memcache support out of the box</strong> with no extra work. How great is that?</p> <p>However, you also want to support an RDBMS. If you have the time, you could roll your own abstraction layer on top of objectify and the RDBMS persistance layer of your choice. That would give you the edge in performance that you are looking for. ;)</p> <p>If that is not an option I would suggest JPA (not because I have used it myself, but because I had so much trouble with JDO).</p> <p>Hope this helps!</p>
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    1. USStefan
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    1. COFWIW you could use DataNucleus "javax.cache" provider as L2 cache (to access memcache) with GAE/J (single persistence property, even with the ancient version they use) not that they ever bother to publicise the fact.
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    2. COI got the JDO cache to work with memcache. Took some research so I thought I'd share it as a blog-post: http://ukena.de/content/enabling-jdo-caching-google-app-engine
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    3. COThx Stefan. Should help lots of people until Google ever update their plugin; we've made many internal changes since v1.1 in L2 caching to reduce down to the minimal any calls to the datastore.
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