A few words of (extreme) caution: This is not a drop-in replacement for the version of the plugin that ships with the App Engine SDK. You'll need to update your JPA/JDO config files and you may notice that non-transactional writes now execute right away. A detailed list of the meaningful changes can be found at http://code.google.com/p/datanucleus-appengine/source/browse/trunk/V2_NOTES.txt. We'll get these notes polished and published as we get closer to an official release.
If you're feeling brave please try it out, provide feedback on the GAE Java group, and file bugs in the dedicated issue tracker.
Hello Mas Ross, Help me.... You can let me ask how to fix the one megabyte limit in the datastore. Since my application development website on google app engine, the query data, the error message "Out of sync".