Sorry for the late response, somehow I missed your reply. No, just using the default GAE stuff with annotations on the persisted objects.
Code is under http://code.google.com/p/appengine-closure-chat/, app ID is ptucker. Code: Persisted objects: http://code.google.com/p/appengine-closure-chat/source/browse/trunk/src/com/honkentuber/chat/Room.java http://code.google.com/p/appengine-closure-chat/source/browse/trunk/src/com/honkentuber/chat/Message.java See selectMessages and persistMessage here: http://code.google.com/p/appengine-closure-chat/source/browse/trunk/src/com/honkentuber/chat/ChatServlet.java All other classes under http://code.google.com/p/appengine-closure-chat/source/browse/trunk/src. Thanks for taking a look, Philip On Dec 23 2009, 5:46 pm, "Jason (Google)" <[email protected]> wrote: > This is definitely odd. Are you using any frameworks or libraries aside from > the App Engine-supplied JDO/JPA implementation? I assume you're using a > query to fetch the most recent n messages sorted by a date -- can you reply > with your app ID, a snippet of your fetching and persisting code, and any > extra information that might be relevant? > > Thanks, > - Jason > > > > On Mon, Dec 21, 2009 at 11:51 PM, Philip Tucker <[email protected]> wrote: > > I've got a very simple application with very little data in it. It's a > > simple chat app with 2 tables, Room and Message. Each server requests > > stores a message and returns the most recent n messages, where n is on > > the order of 1-5. > > > Each request is taking 2-3 seconds. I'm doing 3 datastore > > transactions; look up room by ID, insert message, look up most recent > > n message by room ID. I know there's some optimization I could do to > > skip the room lookup, but this is still way slower than I would > > expect. > > > I've also been getting a few of these errors, maybe 1/20 requests or > > so: > > > com.honkentuber.Servlet doIt: error on ChatServlet > > com.google.appengine.api.datastore.DatastoreTimeoutException: Unknown > > at > > com.google.appengine.api.datastore.DatastoreApiHelper.translateError > > (DatastoreApiHelper.java:42) > > at > > com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall > > (DatastoreApiHelper.java:60) > > at com.google.appengine.api.datastore.DatastoreServiceImpl$2.run > > (DatastoreServiceImpl.java:173) > > at > > com.google.appengine.api.datastore.TransactionRunner.runInTransaction > > (TransactionRunner.java:30) > > at com.google.appengine.api.datastore.DatastoreServiceImpl.put > > (DatastoreServiceImpl.java:161) > > at com.google.appengine.api.datastore.DatastoreServiceImpl.put > > (DatastoreServiceImpl.java:141) > > at com.google.appengine.api.datastore.DatastoreServiceImpl.put > > (DatastoreServiceImpl.java:133) > > at > > > org.datanucleus.store.appengine.RuntimeExceptionWrappingDatastoreService.pu > > t > > (RuntimeExceptionWrappingDatastoreService.java:93) > > at org.datanucleus.store.appengine.DatastorePersistenceHandler.put > > (DatastorePersistenceHandler.java:165) > > at org.datanucleus.store.appengine.DatastorePersistenceHandler.put > > (DatastorePersistenceHandler.java:112) > > at > > org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects > > (DatastorePersistenceHandler.java:239) > > at > > org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject > > (DatastorePersistenceHandler.java:225) > > at org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent > > (JDOStateManagerImpl.java:3185) > > at org.datanucleus.state.JDOStateManagerImpl.makePersistent > > (JDOStateManagerImpl.java:3161) > > at org.datanucleus.ObjectManagerImpl.persistObjectInternal > > (ObjectManagerImpl.java:1298) > > at org.datanucleus.ObjectManagerImpl.persistObject > > (ObjectManagerImpl.java:1175) > > at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent > > (JDOPersistenceManager.java:669) > > at org.datanucleus.jdo.JDOPersistenceManager.makePersistent > > (JDOPersistenceManager.java:694) > > at com.honkentuber.chat.ChatServlet.persistMessage(ChatServlet.java: > > 83) > > at com.honkentuber.chat.ChatServlet.newJspResponse(ChatServlet.java: > > 21) > > at com.honkentuber.Servlet.doIt(Servlet.java:42) > > at com.honkentuber.Servlet.doPost(Servlet.java:29) > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) > > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) > > at > > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > > 487) > > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > > (ServletHandler.java:1093) > > at > > com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter > > (ParseBlobUploadFilter.java:97) > > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > > (ServletHandler.java:1084) > > at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter > > (SaveSessionFilter.java:35) > > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > > (ServletHandler.java:1084) > > at > > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter > > (TransactionCleanupFilter.java:43) > > at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter > > (ServletHandler.java:1084) > > at org.mortbay.jetty.servlet.ServletHandler.handle > > (ServletHandler.java:360) > > at org.mortbay.jetty.security.SecurityHandler.handle > > (SecurityHandler.java:216) > > at org.mortbay.jetty.servlet.SessionHandler.handle > > (SessionHandler.java:181) > > at org.mortbay.jetty.handler.ContextHandler.handle > > (ContextHandler.java:712) > > at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: > > 405) > > at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle > > (AppVersionHandlerMap.java:238) > > at org.mortbay.jetty.handler.HandlerWrapper.handle > > (HandlerWrapper.java:139) > > at org.mortbay.jetty.Server.handle(Server.java:313) > > at > > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: > > 506) > > at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete > > (HttpConnection.java:830) > > at > > com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable > > (RpcRequestParser.java:76) > > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381) > > at > > > com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceReques > > t > > (JettyServletEngineAdapter.java:135) > > at com.google.apphosting.runtime.JavaRuntime.handleRequest > > (JavaRuntime.java:235) > > at com.google.apphosting.base.RuntimePb$EvaluationRuntime > > $6.handleBlockingRequest(RuntimePb.java:5235) > > at com.google.apphosting.base.RuntimePb$EvaluationRuntime > > $6.handleBlockingRequest(RuntimePb.java:5233) > > at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest > > (BlockingApplicationHandler.java:24) > > at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java: > > 363) > > at com.google.net.rpc.impl.Server$2.run(Server.java:838) > > at com.google.tracing.LocalTraceSpanRunnable.run > > (LocalTraceSpanRunnable.java:56) > > at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan > > (LocalTraceSpanBuilder.java:536) > > at com.google.net.rpc.impl.Server.startRpc(Server.java:793) > > at com.google.net.rpc.impl.Server.processRequest(Server.java:368) > > at com.google.net.rpc.impl.ServerConnection.messageReceived > > (ServerConnection.java:448) > > at com.google.net.rpc.impl.RpcConnection.parseMessages > > (RpcConnection.java:319) > > at com.google.net.rpc.impl.RpcConnection.dataReceived > > (RpcConnection.java:290) > > at com.google.net.async.Connection.handleReadEvent(Connection.java: > > 466) > > at com.google.net.async.EventDispatcher.processNetworkEvents > > (EventDispatcher.java:759) > > at com.google.net.async.EventDispatcher.internalLoop > > (EventDispatcher.java:205) > > at com.google.net.async.EventDispatcher.loop(EventDispatcher.java: > > 101) > > at com.google.net.rpc.RpcService.runUntilServerShutdown > > (RpcService.java:251) > > at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run > > (JavaRuntime.java:394) > > at java.lang.Thread.run(Unknown Source) > > > -- > > > You received this message because you are subscribed to the Google Groups > > "Google App Engine" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]<google-appengine%2Bunsubscrib > > [email protected]> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-appengine?hl=en.
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