A rack server could be purchased anywhere. However, I want to streamline my development and it would be best to build every thing on GAE structure. Given I want to store real-time game data using memcache, If I strictly maintain number of objects stored in memcache (thus, limit the use of memcache to certain size), then will my memcache be available even if the app is restarted on another server in the cloud? What is the probability that my data in memcache get lost during normal operation (given I will not let memcache data expired)?
On Apr 18, 12:57 am, Jeff Schnitzer <[email protected]> wrote: > You should never put something in the memcache that you don't mind > losing when the memcache service flushes your data. Players are > probably going to be very unhappy if their scores and current > positions suddenly disappear mid-game. > > GAE is just not an appropriate platform for a realtime game. You can > do turnbased games, or games that have a slow update period (using the > datastore), but GAE doesn't provide the bread-and-butter of realtime > games: persistent socket connections and singleton in-memory data > structures. > > You could spend months working around this problem with XMPP and > hacking together a fragile solution on top of memcache, or you could > just spend a few bucks a month on a more traditional server > infrastructure running elsewhere in the cloud. A 256M slice at > rackspace is $11/mo. A week of Starbucks costs more than that. > > Jeff > > > > On Fri, Apr 16, 2010 at 9:28 PM, Timofey Koolin <[email protected]> wrote: > > You can store your data in memcache and in datastore. Then you read > > data from memcache or (if is'n exsists in memcache) from datasrore. Or > > you can use write-behind cachehttp://www.youtube.com/watch?v=HL5igKTuN8M > > > On 17 апр, 08:04, Phuong Nguyen <[email protected]> wrote: > >> Hi guys, > >> I'm creating an online game server with GAE and there's a few concerns > >> that I'd like to ask for advice. > > >> One of my problem is that I need to manage a lot of information that > >> would not make sense to be stored in database. Like the status of each > >> player, the last time server seen such player, his current position in > >> the game. I'd like to store all of these information in the memory and > >> periodically persist back to the data store. Problem is (correct me if > >> I'm wrong) that GAE may shutdown my app and restart it on different > >> server at any time, so, data in memory would be gone and I need to > >> reload them from the database. But, certainly, if GAE Server restart > >> my app before the periodical saving happens, then the status of > >> players may be gone without my ability to recover back from database. > >> And, these data are subject to high change, so, persist them to data > >> store frequently would not be sensible. > > >> So, I may encounter problems to keep these data in memory. And I may > >> also encounter performance problem to constantly persist these data to > >> data store. So, would you guys please give me some advice? Am I > >> missing some thing or there should be any technology/tricks that can > >> be employed on GAE that can facilitate me to build such online game > >> like this? > > >> Thanks. > >> Phuong > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Google App Engine for Java" group. > >> To post to this group, send email to > >> [email protected]. > >> To unsubscribe from this group, send email to > >> [email protected]. > >> For more options, visit this group > >> athttp://groups.google.com/group/google-appengine-java?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google App Engine for Java" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group > > athttp://groups.google.com/group/google-appengine-java?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/google-appengine-java?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
