[infinispan-dev] Infinispan and Google app engine

Hi all, Manik asked me to investigate what it would take to deploy Infinispan inside google app engine (GAE). As you might have heard GAE execution environment is somewhat constricted (can not create threads, write to files, open sockets, etc). Right from a get go it was clear that we can not run Infinispan in any mode other than local. However, even if Infinispan is run in local mode GAE users could benefit from Infinispan's JSR-107 cache interface that is backed up with cache store implemented using google datastore api. There probably are use case scenarios where GAE users interact with both google provided JSR-107 memcache service [1] and datastore [2] separately where in fact Infinispan's JSR-107 interface that is automatically synced with datastore would make much more sense. Manik and I went back and forth and decided to put this sub project on a back burner at this moment. Even though we could accommodate GAE's thread restriction it turns out that GAE sandbox restrictions involve several apis that we use (JAXB, JMX, JNDI among others) and retrofitting Infinispan into this tight sandbox would be a headache. There is a strong comunity push to unrestrict these API and it seems pressures from community would eventually be successful. Also, I am still awaiting for some feedback from Mircea to see if we can even implement google datastore cache loader to be transactional. Even though GAE datastore supports transactions they are only available in the same entity group [3]. As far as I understand GAE datastore they implement horizontal partitioning which basically involves putting different rows into different tables. Think each Person row entry would have to be in different table unless they are in some owns (say parent-child) relationship. Feedback appreciated, Vladimir [1] http://code.google.com/appengine/docs/java/memcache/usingjcache.html [2] http://code.google.com/appengine/docs/java/datastore/ [3] http://www.youtube.com/watch?v=2jW2iSKDipY (between 6:45 and 11:40)