[appengine-java] Re: Is it possible to implement Open EntityManager in View to avoid JDODetachedFieldAccessException?
I'm using Spring therefore I tried to configure the OpenEntityManagerInViewInterceptor, if this works as it's supposed to I shouldn't get JDODetachedFieldAccessException anymore, but I still get it. And what state are the objects in when you access the field ? detached ? and what PersistenceContext is used ? As per http://www.datanucleus.org/products/accessplatform_2_0/jpa/object_lifecycle.html DataNucleus 1.x supports Transaction out of the box (whereas DataNucleus 2.x supports both). You could easily use the persistence properties datanucleus.DetachAllOnCommit = false datanucleus.DetachOnClose=true if you wanted Extended. -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] [ANN] Gaelyk 0.3.2, a lightweight Groovy toolkit for App Engine
Hi all, This is the first time I'm posting about Gaelyk in this group, I hope it's okay according to the netiquette of the Group. If not, please advise me the best place to give some news on that topic, on an occasional basis. I wanted to share with you the r*elease of Gaelyk 0.3.2, a lightweight Groovy toolkit for App Engine*. Gaelyk is a thin layer on top of the Google App Engine SDK, that is aimed at simplifying the creation of applications written in the *G**roovy dynamic language* to be deployed on GAE. Thanks to Groovlets (servlet scripts basically) and templates, and entities, you can follow an *MVC paradigm* for creating your applications. Several nice *syntax shortcuts simplify the usage of the low-level SDK APIs*, such as an email.send to: recipi...@gmail.com shorthand and more. This new release adds some handy *URL routing system* to have nice RESTful URLs. If you want to learn more about this little framework, please have a look at the extensive Tutorial: http://gaelyk.appspot.com/tutorial Gaelyk was also presented recently at the Devoxx conference in Belgium, along with Patrick Chanezon descripting the GAE platform. You can view the slides of the presentation here: http://glaforge.free.fr/blog/groovy/286 You can download Gaelyk and a template project in the download section of the website: http://gaelyk.appspot.com/download And get involve in the community: http://gaelyk.appspot.com/community Particularly, you can join the Gaelyk Google Group for posting questions and chatting with the users and developers: http://groups.google.com/group/gaelyk Gaelyk is an *Open Source project* licensed under the terms of the *Apache Software License 2.0*. The project is hosted on GitHub: http://github.com/glaforge/gaelyk A number of applications online already use this lightweight toolkit. - For example, the Groovy Web Console lets you execute and share Groovy scripts online: http://groovyconsole.appspot.com/ - The Gaelyk website itself is of course a Gaelyk application: http://gaelyk.appspot.com/ - The iUI iPhone JavaScript toolkit website is also powered by Gaelyk: http://iui-js.appspot.com/ (best viewed with an iPhone) - The Averone's company website is developed with Gaelyk: http://www.averone.com.br/ In the future, we're looking forward to simplifying other parts of the GAE SDK, for instance providing some nice DSLs (Domain-Specific Languages) to improve and enrich the low-level datastore APIs to further simplify querying the datastore, or to create a RESTful language on top of the URL Fetch service to interact with REST backends. We're looking forward to your feedback and having you on board! -- Guillaume Laforge Groovy Project Manager Head of Groovy Development at SpringSource http://www.springsource.com/g2one -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Is there a recommended way to differentiate between production and dev GAE environments?
Another approach I've just found is doing something like: ApiProxy.getCurrentEnvironment().getClass().getName().contains (LocalHttpRequestEnvironment) Not sure in the end what's the best approach of them all. On 24 nov, 16:29, Marcel Overdijk marceloverd...@gmail.com wrote: Or use a Listener as described herehttp://marceloverdijk.blogspot.com/2009/10/determining-runtime-enviro... On 23 nov, 15:58, Nacho Coloma icol...@gmail.com wrote: To answer my own question, this has been my best shot this far: SecurityManager sm = System.getSecurityManager(); localDevelopmentEnvironment = sm == null || com.google.appengine.tools.development.DevAppServerFactory $CustomSecurityManager.equals(sm.getClass().getName()); If anyone has a better way, I will be glad to hear. On Nov 23, 1:17 pm, Nacho Coloma icol...@gmail.com wrote: Hi all, I was considering options, but I first wanted to ask: is there a recommended way to differentiate between my local development environment and the real GAE server? This far, the only options I can think of are: * adding a -Dtest=true to my eclipse launcher * looking up for any test environment classes (Class.forName) but it's not reliable as they could get included by mistake in any WAR release. * I have been searching for instanceof alternatives i.e.: DatastoreServiceFactory.getService() instanceof LocalDatastoreService but I could not find any such expression that could possibly work. Ideas? What are people using out there? Nacho. -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] problem in XMPP sendMessage()
I am using XMPP and getting following error when I try /CODE*/ Message msg = new MessageBuilder() .withRecipientJids(receiverJid) .withFromJid(new JID(recipientJid[0].getId()) ) .withMessageType(MessageType.NORMAL) .withBody(msgBody) .build(); SendResponse status =xmpp.sendMessage(msg); My JID's are correct. msgBody is not null Problem occures at xmpp.sendMessage(msg); I don't understand what is null? /***ERROR DETAILS/ Uncaught exception from servlet java.lang.NullPointerException at com.google.appengine.api.xmpp.XMPPServiceImpl.createMessageRequest(XMPPServiceImpl.java:120) at com.google.appengine.api.xmpp.XMPPServiceImpl.sendMessage(XMPPServiceImpl.java:105) at com.ChatRoom.server.XMPPReceiverServlet.doPost(XMPPReceiverServlet.java:165) 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.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$RequestHandler.headerComplete(HttpConnection.java:830) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139) at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:239) at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5135) at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5133) 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$2.run(Server.java:814) at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56) at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516) at com.google.net.rpc.impl.Server.startRpc(Server.java:769) at com.google.net.rpc.impl.Server.processRequest(Server.java:351) at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:437) at com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:319) at com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:290) at com.google.net.async.Connection.handleReadEvent(Connection.java:436) at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762) at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:207) at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:101) at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:251) at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run(JavaRuntime.java:396) at java.lang.Thread.run(Unknown Source) -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: xmlHttp request status is 0 for google maps http geocoder
Realized the issue - didn't realize there was a cross domain
restriction on AJAX. Problem solved. thanks
On Nov 27, 5:09 pm, shaz ssh...@gmail.com wrote:
Hi,
I am trying to submit an HTTP request via AJAX from the client to the
Google Maps Geocoding service. I keep getting a status of 0.
I know the request is valid because when I enter the URL right into
the browser address bar I get a valid result. Here is the code (assume
'url_string' has a valid url to the geocoding service - I have tested
this already as mentioned above):
var request = GXmlHttp.create(); request.open(GET, url_string,
true); request.onreadystatechange = function() { if
(request.readyState == 4) { alert(STATUS IS + request.status);
} }
request.send(null);
My app is running on Google appengine and I get the error when I try
it locally but also when I deploy and try it.
Any help would be appreciated.
--
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[appengine-java] Re: Why is it called Google App Engine for Java ?
On Nov 27, 7:19 pm, Diana Cruise diana.l.cru...@gmail.com wrote: Ted... java.lang.Thread, you want to launch new processes from within your app server...that's a job for URLFetch. Unlike Thread, I can't use URLFetch to perform a task asynchronously and return a result to the calling thread. -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] problem in XMPP sendMessage()
I am not sure, but i think you dont need to(should not) set fromJid, as
message will be sent from your application JID.
I am running following code and its working .
JID jid = new JID(responseJid);
Message msg = new MessageBuilder()
.withRecipientJids(jid)
.withBody(msgBody)
.build();
boolean messageSent = false;
XMPPService xmpp = XMPPServiceFactory.getXMPPService();
if (xmpp.getPresence(jid).isAvailable()) {
SendResponse status = xmpp.sendMessage(msg);
messageSent = (status.getStatusMap().get(jid) ==
SendResponse.Status.SUCCESS);
}
On Sat, Nov 28, 2009 at 2:51 PM, sahil mahajan sahilm2...@gmail.com wrote:
I am using XMPP and getting following error when I try
/CODE*/
Message msg = new MessageBuilder()
.withRecipientJids(receiverJid)
.withFromJid(new JID(recipientJid[0].getId()) )
.withMessageType(MessageType.NORMAL)
.withBody(msgBody)
.build();
SendResponse status =xmpp.sendMessage(msg);
My JID's are correct. msgBody is not null
Problem occures at xmpp.sendMessage(msg);
I don't understand what is null?
/***ERROR
DETAILS/
Uncaught exception from servlet
java.lang.NullPointerException
at
com.google.appengine.api.xmpp.XMPPServiceImpl.createMessageRequest(XMPPServiceImpl.java:120)
at
com.google.appengine.api.xmpp.XMPPServiceImpl.sendMessage(XMPPServiceImpl.java:105)
at
com.ChatRoom.server.XMPPReceiverServlet.doPost(XMPPReceiverServlet.java:165)
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$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at
org.mortbay.jetty.servlet.ServletHandler$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.serviceRequest(JettyServletEngineAdapter.java:139)
at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:239)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5135)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5133)
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:814)
at
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
at
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
at com.google.net.rpc.impl.Server.startRpc(Server.java:769)
at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
at
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:437)
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:436)
at
com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:762)
at
[appengine-java] Re: Problem in uploading jsp file
Problem solved I found solution at comment 16 of Issue 1226 http://groups.google.com/group/google-appengine-java/browse_thread/thread/24aadd04f3ae0245 Regards Sahil On Nov 25, 11:14 pm, Sahil Mahajan sahilm2...@gmail.com wrote: Hello Stephan I am new to gae. My JAVA_HOME variable has value C:\Program Files\Java \jdk1.6.0_01 I also checked build.xml, but I could not understand where I need to mention jdk instead of jre. Can you give me some more details Regards Sahil On Nov 24, 11:00 pm, Stephan Hartmann hartm...@metamesh.de wrote: You are using a Java Runtime Environment (JRE) which does not include a compiler. You have to use a JDK instead. Regards, Stephan sahil mahajan schrieb: Hello I am working on java google app engine. When I try to upload my application, I receive following error Error Details: Nov 24, 2009 10:18:11 PM org.apache.jasper.JspC processFile INFO: Built File: \addressbook.jsp java.lang.IllegalStateException: cannot find javac executable based on java.home , tried C:\Program Files\Java\jre1.6.0_04\bin\javac.exe and C:\Program Files\ Java\bin\javac.exe Unable to upload app: cannot find javac executable based on java.home, tried C: \Program Files\Java\jre1.6.0_04\bin\javac.exe and C:\Program Files\Java\bin\ja vac.exe If I remove addressbook.jsp file, error does not occur What could be the reason? -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: Why is it called Google App Engine for Java ?
Actually, many people had the same reaction when GAE/J was released. See for instance, http://weblogs.java.net/blog/2009/04/16/google-app-engine-java-sucks Without a doubt if some smaller player created such an incompatible implementation they would not be allowed to call it 'Java'. On Nov 27, 7:19 pm, Diana Cruise diana.l.cru...@gmail.com wrote: As far as the naming goes, you may be the first to raise this concern in GAE's existence (2 years or so). -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] need comment on using @transactional on service layer
hi, can anyone comments whether my architecture is ok for using @transactional with spring on service layer? http://tinyurl.com/ybmev2b -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: problem in XMPP sendMessage()
I removed .withFromJid(new JID(recipientJid[0].getId()) )
but I am still facing problem.
The servlet works correctly for first two messages. But problem starts
when servlet receives third message.
I find this strange. Initially it works fine, but gives problem from
third message.
Regards
Sahil Mahajan
On Nov 28, 8:19 pm, Ravi Sharma ping2r...@gmail.com wrote:
I am not sure, but i think you dont need to(should not) set fromJid, as
message will be sent from your application JID.
I am running following code and its working .
JID jid = new JID(responseJid);
Message msg = new MessageBuilder()
.withRecipientJids(jid)
.withBody(msgBody)
.build();
boolean messageSent = false;
XMPPService xmpp = XMPPServiceFactory.getXMPPService();
if (xmpp.getPresence(jid).isAvailable()) {
SendResponse status = xmpp.sendMessage(msg);
messageSent = (status.getStatusMap().get(jid) ==
SendResponse.Status.SUCCESS);
}
On Sat, Nov 28, 2009 at 2:51 PM, sahil mahajan sahilm2...@gmail.com wrote:
I am using XMPP and getting following error when I try
/CODE*/
Message msg = new MessageBuilder()
.withRecipientJids(receiverJid)
.withFromJid(new JID(recipientJid[0].getId()) )
.withMessageType(MessageType.NORMAL)
.withBody(msgBody)
.build();
SendResponse status =xmpp.sendMessage(msg);
My JID's are correct. msgBody is not null
Problem occures at xmpp.sendMessage(msg);
I don't understand what is null?
/***ERROR
DETAILS/
Uncaught exception from servlet
java.lang.NullPointerException
at
com.google.appengine.api.xmpp.XMPPServiceImpl.createMessageRequest(XMPPServiceImpl.java:120)
at
com.google.appengine.api.xmpp.XMPPServiceImpl.sendMessage(XMPPServiceImpl.java:105)
at
com.ChatRoom.server.XMPPReceiverServlet.doPost(XMPPReceiverServlet.java:165)
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.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$RequestHandler.headerComplete(HttpConnection.java:830)
at
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139)
at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:239)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5135)
at
com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:5133)
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:814)
at
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)
at
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:516)
at com.google.net.rpc.impl.Server.startRpc(Server.java:769)
at com.google.net.rpc.impl.Server.processRequest(Server.java:351)
at
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:437)
at
[appengine-java] Re: Web Service deployment using Axis in Google app engine for java
It's interesting for me too. This is not the answer but may be useful: http://blog.cloudwhiz.com/2009/09/exposing-soap-service-on-gae-part-1.html -Andrey -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] JPA Like query
Hi all, I have a problem with a fairly basic JPA query that contains a Like clause My query looks like this SELECT FROM package.Object q WHERE q.property LIKE 'w%' According to the discussions in this forum there should be limited support for this. However I can´t get this limited query (which is all I need) to work. What am I doing wrong ? regards Wouter -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] import deployed project into eclipse
Is there a way to import the source code into eclipse of a previously deployed project from the app engine cloud? I want to work on the site but from another pc that does not share the workspace. -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Spring MVC with annotations
I developed an program with Spring MVC + annotations. He done in my computer. But when I make deploy and try acess the application, the GAE throws an error. Someone got use annotations with Spring MVC? -- Rafael Reuber MSN/Gtalk: psico.in...@gmail.com -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: JPA Like query
Hi, found the problem, I was still using an old GAE version. When I switch to GAE 1.2.6 the query described above works regards Wouter On Nov 28, 8:53 pm, Wouter wouter.nie...@gmail.com wrote: Hi all, I have a problem with a fairly basic JPA query that contains a Like clause My query looks like this SELECT FROM package.Object q WHERE q.property LIKE 'w%' According to the discussions in this forum there should be limited support for this. However I can´t get this limited query (which is all I need) to work. What am I doing wrong ? regards Wouter -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Re: JSF 2.0.1 java.lang.ClassNotFoundException: void
A simple project (where the JSF2 framework initializes and a default page is displayed) is available at Google Code: http://code.google.com/p/jsf2template/. This is the source code for the application I wrote developing the tutorial for configuring a JSF 2 project to run on Google App Engine - http://jsf2template.appspot.com/. Derek On Nov 23, 2009, at 1:55 PM, Alexandre Calvão wrote: Does anyone have a archetype project for GAE, whith the JSF Working ? I could not do this think work. Thanks 2009/11/20 addy.bhardwaj addy.bhard...@gmail.com I had a similar issue. The way I fixed it was to configure state saving to client rather than server. For details check my blog http://consultingblogs.emc.com/jaddy/archive/2009/11/20/jsf2-in-google-app-engine.aspx Let me know if this fixes your problem. On Nov 12, 6:15 pm, Mirco Attocchi ami...@gmail.com wrote: Problem using majorra 2.0.1 and GAE 1.2.6, but some times pages render correctly. javax.servlet.ServletException: java.lang.RuntimeException: java.lang.ClassNotFoundException: void at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle (AppVersionHandlerMap.java:240) 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:139) at com.google.apphosting.runtime.JavaRuntime.handleRequest (JavaRuntime.java:239) at com.google.apphosting.base.RuntimePb$EvaluationRuntime $6.handleBlockingRequest(RuntimePb.java:5135) at com.google.apphosting.base.RuntimePb$EvaluationRuntime $6.handleBlockingRequest(RuntimePb.java:5133) 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$2.run(Server.java:814) at com.google.tracing.LocalTraceSpanRunnable.run (LocalTraceSpanRunnable.java:56) at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan (LocalTraceSpanBuilder.java:516) at com.google.net.rpc.impl.Server.startRpc(Server.java:769) at com.google.net.rpc.impl.Server.processRequest(Server.java:351) at com.google.net.rpc.impl.ServerConnection.messageReceived (ServerConnection.java:437) at com.google.net.rpc.impl.RpcConnection.parseMessages (RpcConnection.java:319) at com.google.net.rpc.impl.RpcConnection.dataReceived (RpcConnection.java:290) at com.google.net.async.Connection.handleReadEvent(Connection.java: 436) at com.google.net.async.EventDispatcher.processNetworkEvents (EventDispatcher.java:762) at com.google.net.async.EventDispatcher.internalLoop (EventDispatcher.java:207) at com.google.net.async.EventDispatcher.loop(EventDispatcher.java: 101) at com.google.net.rpc.RpcService.runUntilServerShutdown (RpcService.java:251) at com.google.apphosting.runtime.JavaRuntime$RpcRunnable.run (JavaRuntime.java:396) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: void at com.google.apphosting.runtime.jetty.SessionManager.deserialize (SessionManager.java:389) at com.google.apphosting.runtime.jetty.SessionManager.loadSession (SessionManager.java:307) at com.google.apphosting.runtime.jetty.SessionManager.getSession (SessionManager.java:282) at org.mortbay.jetty.servlet.AbstractSessionManager.getHttpSession (AbstractSessionManager.java:237) at org.mortbay.jetty.Request.getSession(Request.java:998) at com.sun.faces.application.WebappLifecycleListener.syncSessionScopedBeans (WebappLifecycleListener.java:393) at com.sun.faces.application.WebappLifecycleListener.requestDestroyed (WebappLifecycleListener.java:117) at com.sun.faces.config.ConfigureListener.requestDestroyed (ConfigureListener.java:341) at org.mortbay.jetty.handler.ContextHandler.handle (ContextHandler.java:725) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: 405) at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle (AppVersionHandlerMap.java:238) ... 27 more Caused by: java.lang.ClassNotFoundException: void at
[appengine-java] Re: redirect /file.jsp
You might want to use a framework like Struts or Spring. I also have a redirect.jsp in my app like Rusty, only that any of my Spring MVC controllers can use it and package in the request the url where the page will be redirected. Anyway the benefit I see here is that for one you don't have to declare it as static in the appengine-web.xm (it works for me) and of course many others that the framework can give. On Nov 28, 2:49 am, Don lydonchan...@gmail.com wrote: Hi, Trivial question for the gurus here, if i do: response.redirect(bla.jsp) I get WARNING: Can not serve /bla.jsp directly. You need to include it in static-files in your appengine-web.xml. on development server (localhost) Everything is ok when it is run on the cloud. Why?? I know I have to do this below so it works on localhost... servlet servlet-nameblajsp/servlet-name jsp-file/bla.jsp/jsp-file /servlet servlet-mapping servlet-nameblajsp/servlet-name url-pattern/blajsp/url-pattern /servlet-mapping -- 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 google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] Re: problem in XMPP sendMessage()
Hi.
I tested execution by the following source.
JID jid = new JID(x...@gmail.com); // set your send gmail address
Message msg = new MessageBuilder().withRecipientJids(jid)
.withFromJid(new JID(x...@appspot.com) ) // set your
ap...@appspot.com
.withMessageType(MessageType.NORMAL)
.withBody(send-message).build(); //set msg String
boolean messageSent = false;
XMPPService xmpp = XMPPServiceFactory.getXMPPService();
if (xmpp.getPresence(jid).isAvailable()) {
SendResponse status = xmpp.sendMessage(msg);
messageSent = (status.getStatusMap().get(jid) ==
SendResponse.Status.SUCCESS);
}
I executed about ten times.
My Gtalk is seem to receive it normally.
Though various possibilities are thought.
If it is possible
Please execute it by the fixed value
as much as possible to simplify a problem.
Though something only has to be able to be useful.
thanks.
On 11月29日, 午前2:52, Sahil Mahajan sahilm2...@gmail.com wrote:
I removed .withFromJid(new JID(recipientJid[0].getId()) )
but I am still facing problem.
The servlet works correctly for first two messages. But problem starts
when servlet receives third message.
I find this strange. Initially it works fine, but gives problem from
third message.
Regards
Sahil Mahajan
On Nov 28, 8:19 pm, Ravi Sharma ping2r...@gmail.com wrote:
I am not sure, but i think you dont need to(should not) set fromJid, as
message will be sent from your application JID.
I am running following code and its working .
JID jid = new JID(responseJid);
Message msg = new MessageBuilder()
.withRecipientJids(jid)
.withBody(msgBody)
.build();
boolean messageSent = false;
XMPPService xmpp = XMPPServiceFactory.getXMPPService();
if (xmpp.getPresence(jid).isAvailable()) {
SendResponse status = xmpp.sendMessage(msg);
messageSent = (status.getStatusMap().get(jid) ==
SendResponse.Status.SUCCESS);
}
On Sat, Nov 28, 2009 at 2:51 PM, sahil mahajan sahilm2...@gmail.com wrote:
I am using XMPP and getting following error when I try
/CODE*/
Message msg = new MessageBuilder()
.withRecipientJids(receiverJid)
.withFromJid(new JID(recipientJid[0].getId()) )
.withMessageType(MessageType.NORMAL)
.withBody(msgBody)
.build();
SendResponse status =xmpp.sendMessage(msg);
My JID's are correct. msgBody is not null
Problem occures at xmpp.sendMessage(msg);
I don't understand what is null?
/***ERROR
DETAILS/
Uncaught exception from servlet
java.lang.NullPointerException
at
com.google.appengine.api.xmpp.XMPPServiceImpl.createMessageRequest(XMPPServiceImpl.java:120)
at
com.google.appengine.api.xmpp.XMPPServiceImpl.sendMessage(XMPPServiceImpl.java:105)
at
com.ChatRoom.server.XMPPReceiverServlet.doPost(XMPPReceiverServlet.java:165)
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$CachedChain.doFilter(ServletHandler.java:1093)
at
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at
org.mortbay.jetty.servlet.ServletHandler$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.serviceRequest(JettyServletEngineAdapter.java:139)
at
[google-appengine] Re: Can a bank system be transactional and low contentious?
On Nov 27, 2:42 pm, 风笑雪 kea...@gmail.com wrote: Actually, I just want to know how to avoid big entity group, is it possible or not. It obvious has some other parts need to be figured out, but I'm not really building a bank system, just concern about it. Main anomaly called arbitrage (no such thing...) while floats and transaction costs testable: stoploss method can reweight markowitz portfolio with cron=you win. Handling currencies requires external verification. One approach was keep a table with exchangerates. Which is no modern way. You can implement an own currency amount, register app as a computergame, use external certified you trust. Tech we can verify selves, economy more like acceptance or psychology 2009/11/27 Niklas Rosencrantz teknik...@gmail.com: On Fri, Nov 27, 2009 at 10:22 AM, 风笑雪 kea...@gmail.com wrote: If so, why google's engineers wast so much time for supporting the useless transaction system? No google guys would like tell me the reason? For the future, tech team and investment banking very 2 systems you know, one is more legislative (de jure) and technology more de facto. Ask a technical physicists can matter tunnel through... answer yes. Ask investment banker and answer is the opposite (normative) that your vault is sealed. I don't think only using app layer is a good choice, since I need connect the outside db by urlfetch which not efficient and safe enough. It's most natural obvious very good choice avoid storage whenever you can and just pass on. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Issue 777: Officially Support Naked Domains for GAE Apps
Why can you not set up forwarding from the naked domain to www? It is a DNS function, not anything to do with your browser. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Issue 777: Officially Support Naked Domains for GAE Apps
On Nov 28, 9:38 am, Greg g.fawc...@gmail.com wrote:
Why can you not set up forwarding from the naked domain to www? It is
a DNS function, not anything to do with your browser.
Onway supplierdependent got enom records, godaddy records, offsite,
onsite, looks {Fridge.koolbusiness,www.koolbusiness,koolbusiness}.com,
godaddy roundabout number this number that
A record for ___.com has been deleted which is keeping the domain from
forwarding properly. You will need to create a new A record and point
it to our forwarding IP address;___
First, log into your account:
• Go to the Go Daddy Account Login Page
• Log in using your account username (which may be the same as your
customer number) and password
If you have trouble logging in, our password reset form may help you.
You can find this form through the following link:
Account Retrieval Page
Once logged in, follow these steps:
• In the My Products section, click Domain Manager.
• Click the domain name for which you want to create an A record.
• In the Total DNS section, click Total DNS Control.
• Click the Add New A Record option.
• Complete the following:
Host Name
The host name the A record links to. You can enter @ to map the record
directly to your domain.
•OK.
Sincerely,
-- Forwarded message --
From:
Date: Thu, Nov 19, 2009 at 4:34 PM
Subject: Re: Issue 777 in googleappengine: Officially Support Naked
Domains
for GAE Apps
To: nikla...@gmail.com
Comment #41 on issue 777 by jason.a.collins: Officially Support Naked
Domains for GAE Apps
http://code.google.com/p/googleappengine/issues/detail?id=777
GoDaddy does support maintaining the path and query string on a
redirect (we
have it configured this way).
You just have to navigate through
--
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[google-appengine] Waiting already for 6 hours for 300 records to index
Hi, I added an index to a table with approx 300 records almost 6 hours ago and the index is still building. I am starting to worry, in particular since I will have to add indexes in the future when there are many more records. Is this kind of delay the norm? I don't see any quota related errors, as some of the other posts here report. The app-id is wavedirectory. Regards, -HC -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: preserve data during dev stage
By default, the development server should preserve data between runs. Are you sure you're not launching dev_appserver with the -c or -- clear_datastore flags? On Nov 27, 11:38 pm, james_027 cai.hai...@gmail.com wrote: hi, How do i preserve my data during the development stage. Every time I start my application all my previous inputted data are lost. thanks, -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Waiting already for 6 hours for 300 records to index
Same pb here with a table containing approx 100 records. Already 30 minutes and still building. On 28 nov, 14:07, HC hc...@gmx.net wrote: Hi, I added an index to a table with approx 300 records almost 6 hours ago and the index is still building. I am starting to worry, in particular since I will have to add indexes in the future when there are many more records. Is this kind of delay the norm? I don't see any quota related errors, as some of the other posts here report. The app-id is wavedirectory. Regards, -HC -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Storing Intervals (datetime.timedelta) in the datastore.
On Nov 28, 3:19 pm, JDT john.david@googlemail.com wrote: Hello All, I have an application where I need store the difference in time between two events. Unfortunately the datastore only supports storing 'time' as a datetime.datetime object. In an attempt to circumvent this constraint, I am adding the interval to the smallest possible datetime.datetime object and saving to the datastore, then doing the reverse when recalling the interval. Before I implement this I though I would check to see that I wasn't reinventing the wheel. Does anyone know if there a better way to do this? Will datetime.min will ever change? I am stupidly creating a CPU intensive process? All comments/suggestions most appreciated. Thanks, David For example: Model: class Item(db.Model): interval = db.DateTimeProperty() To save the interval : days = int(self.request.get(days)) hours = int(self.request.get(hours)) minutes = int(self.request.get(minutes) Item = db.Item() delay = timedelta(days = days, hours = hours, minutes = minutes) Item.interval = datetime.min + delay Item.put() To recall the interval: Item = db.Item.get(key) delay = Item.interval - datetime.min You could create your own IntervalProperty, which would store the interval as integer seconds and convert to a python timedelta when you access it: http://googleappengine.blogspot.com/2009/07/writing-custom-property-classes.html -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Re: Waiting already for 6 hours for 300 records to index
same here. i was testing a new class design and indexes are stuck for 5 records :( -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Re: gql not giving full result set
same problem here...
following is my JDO class:
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class _Contact{
@Persistent(primaryKey = true)
private String EmailID;
@Persistent
private String Name;
@Persistent
private ListString Groups;
}
following is my test case:
PersistenceManager pm = pmf.getPersistenceManager();
Query query = pm.newQuery(_Contact.class);
query.setOrdering(EmailID);
query.setFilter(Groups.contains(\mygroup\));
int i = 1;
for(_Contact cont : (List_Contact) query.execute()){
resp.getWriter().print(i++ + + cont.getID() + br);
}
pm.close();
above code printed 23 contacts and when I replaced *
query.setOrdering(EmailID); *by *query.setOrdering(EmailID desc); *it
printed 18 contacts only.
This proves that indexes are not working properly, i am stuck in the middle
of development because of this bug and no body seems to listening to this
problem.
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[google-appengine] Re: GAE for CPU intensive time important application
Thanks for the response. Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. Also, do you think the latency requirements are realistic with GAE? That is, in the ordinary case, could the response be consistently served back to the querying user with delay of max 3 seconds? On Nov 28, 8:35 am, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak.http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: GAE for CPU intensive time important application
Another question, you both recommended Python for some of its features, but isn't Python much slower than Java? So wouldn't that necessitate many more instances/CPUs to keep with the query load? On Nov 28, 9:45 am, Niklas Rosencrantz teknik...@gmail.com wrote: 1) pricing absolutely seems so. gae apps 1/20 cheaper than previous hostingmethods (servers) 2) latency resulting from slow CPU, JIT compiles, etc. latency oriented group we don't focus onhttp://groups.google.com/group/make-the-web-faster in the long run, yes. you can compare to dedicated physical server, much more difficult to configure, compile modules spec for physical architecture, get superiour response time with C++ server pages ouput hello world while best project is security and convenience are kings. latency least prio still important. python is good, same thing in python 1/10 code compared to java, no XML, yaml very neat. java strong point: more ways to solve same problem. On Sat, Nov 28, 2009 at 6:35 AM, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak. http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: preserve data during dev stage
Are you using a Mac ? On Nov 28, 3:21 pm, dburns drrnb...@gmail.com wrote: By default, the development server should preserve data between runs. Are you sure you're not launching dev_appserver with the -c or -- clear_datastore flags? On Nov 27, 11:38 pm, james_027 cai.hai...@gmail.com wrote: hi, How do i preserve my data during the development stage. Every time I start my application all my previous inputted data are lost. thanks, -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Re: GAE for CPU intensive time important application
An app instance cannot serve 2 request at the same time. Suppose you have 100 requests/sec, and GAE offers 100 app instances to serve these requests. At one time it suddenly raise up to 200 requests/sec, so GAE tries to create 100 more app instances to serve. But create a new Java instance may need more than 5 seconds, in these 5 seconds, 500 requests have to wait, and new requests are still coming. So GAE create even more app instances, maybe 50, 100 or 200, and kill them when the 500 requests have been finished. Thus I think Java will waste much more time than Python. Query between Python and Java is almost the same speed, but you need low-level api for batch query: http://gaejava.appspot.com/ 2009/11/29 Eric shel...@gmail.com: Another question, you both recommended Python for some of its features, but isn't Python much slower than Java? So wouldn't that necessitate many more instances/CPUs to keep with the query load? On Nov 28, 9:45 am, Niklas Rosencrantz teknik...@gmail.com wrote: 1) pricing absolutely seems so. gae apps 1/20 cheaper than previous hostingmethods (servers) 2) latency resulting from slow CPU, JIT compiles, etc. latency oriented group we don't focus onhttp://groups.google.com/group/make-the-web-faster in the long run, yes. you can compare to dedicated physical server, much more difficult to configure, compile modules spec for physical architecture, get superiour response time with C++ server pages ouput hello world while best project is security and convenience are kings. latency least prio still important. python is good, same thing in python 1/10 code compared to java, no XML, yaml very neat. java strong point: more ways to solve same problem. On Sat, Nov 28, 2009 at 6:35 AM, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak. http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to
[google-appengine] Re: How can I pre-fill the email address when deploying my apps?
On the command line, you can use: appcfg.py --emai...@b.com update [dir] You still have to enter your password. But I find it only prompts me for my password every 24 hours. On Nov 27, 8:44 pm, samwyse samw...@gmail.com wrote: *sigh* Thanks for letting me know it isn't just me. Maybe someone from Google will fix this. On Nov 27, 8:35 am, Brian br...@semo.net wrote: I got tired of that and went back to command line. After i run it once, then it is up arrow followed by Enter to start the upload, another up arrow + Enter to auto-fill the email field. And then I type in the password. It is much faster than the launcher. From your command prompt move to \program files\google \google_appengine on pre-Win7 or \program files (x86)\google \google_appengine on Win7. Then issue the command appcfg.py update [your app folder] Brian -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: GAE for CPU intensive time important application
Another question, you both recommended Python for some of its features, but isn't Python much slower than Java? Maybe, maybe not, but it may not matter. What fraction of your run- time actually depends on language speed? On Nov 28, 9:13 am, Eric shel...@gmail.com wrote: Another question, you both recommended Python for some of its features, but isn't Python much slower than Java? So wouldn't that necessitate many more instances/CPUs to keep with the query load? On Nov 28, 9:45 am, Niklas Rosencrantz teknik...@gmail.com wrote: 1) pricing absolutely seems so. gae apps 1/20 cheaper than previous hostingmethods (servers) 2) latency resulting from slow CPU, JIT compiles, etc. latency oriented group we don't focus onhttp://groups.google.com/group/make-the-web-faster in the long run, yes. you can compare to dedicated physical server, much more difficult to configure, compile modules spec for physical architecture, get superiour response time with C++ server pages ouput hello world while best project is security and convenience are kings. latency least prio still important. python is good, same thing in python 1/10 code compared to java, no XML, yaml very neat. java strong point: more ways to solve same problem. On Sat, Nov 28, 2009 at 6:35 AM, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak. http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en.- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: GAE for CPU intensive time important application
Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. What makes you think that the request that causes the creation of a new instance doesn't wait for the creation of said instance? (The scheme you suggest is plausible, but why do you think that it's how appengine works?) On Nov 28, 9:03 am, Eric shel...@gmail.com wrote: Thanks for the response. Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. Also, do you think the latency requirements are realistic with GAE? That is, in the ordinary case, could the response be consistently served back to the querying user with delay of max 3 seconds? On Nov 28, 8:35 am, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak.http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en.- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: Waiting already for 6 hours for 300 records to index
Yes ! My index is serving :-) On 28 nov, 17:04, Prashant antsh...@gmail.com wrote: same here. i was testing a new class design and indexes are stuck for 5 records :( -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Re: Waiting already for 6 hours for 300 records to index
mine too... -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Help with an accurate counter with no contention...?
Hey all, I've been looking at the Task Queue API and counter example. In my app, each user will have a couple of counters maintained for them, counting various things. Thing is, these counters need to be accurate. So I'm not sure if the example given for the Task Queue API using memcache would be appropriate for me - it would not be good, really, if my counters were to be inaccurate. My users would expect accurate counts here. So I was thinking about a sort of modified version whereby each change to the counter would be stored in the DS in its own entity. E.g. an entity called 'counter_delta' or some such, which holds the delta to apply to a counter, and the key to the counter that the delta is to be applied to. Then, using the Task Queue I guess I could hoover up all these delta entities, aggregate them, and apply them in one go (or in batches) to the counter. And then delete the delta entries. Thus the task queue is the only thing accessing the counter entity, and it does so in a controllable fashion - so no real contention. Each change to the counter gets written to the store in its own counter_delta entity, so no contention there either. And because the deltas are stored in DS and not in memcache, it should be much more reliable. However, I'm not entirely sure how I should actually go about implementing this, or specifically, the task queue end of things. I'm thinking if there is a change to a counter to be made, I should check if there's a task already running for this counter, and if so, not to do insert any new task, and let the currently running task take care of it. If there is no running task for this counter, I would instead create one, and set it to run in - say - 60 seconds, allowing time for further deltas for this counter to accumulate so the task can take care of more than just one delta. This would mean the counter might be inaccurate for up to 60 seconds, but I can live with that. But what I'm wondering is, how can I implement this 'don't insert a new task if one for this counter is already in the queue or running' behaviour? I was thinking initially that I could give the task a name based on the counter, so that only one such task can exist at any one time. However, I believe we have no control over when that name is freed up - it isn't necessarily freed up when the task ends, I believe names can be reserved for up to 7 days (?) So that wouldn't work. If a name could be freed up when a task was really finished then this could work, I think. I was thinking also I could store a flag so that when a counter_delta is created, I'd look to see if a flag for this counter was present, and if so, do nothing. If not, create the task, and create the flag. Then when the task was all done and didn't see any more counter_deltas, it'd delete the flag. But I'm worried that there could be race conditions here, and some deltas might get overlooked as a result? And if I were to use transactions on such a flag, would I not fall into the same contention trap I'm trying to avoid in the first place? Help? :| Thanks for any advice/insight... -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
[google-appengine] Re: GAE for CPU intensive time important application
Thanks for all your comments. Regarding Python/Java speed, 99% of the runtime is spent iterating in an attempt to converge to some numerical solution . Loops, arithmetic and memory updates. I would guess an interpreted language like Python (am I right?) would be much slower. About the instance set up time, I agree that if query frequency suddenly rises from 100/sec to 200/sec the system I suggested would stall, but I'm don't think I'm expecting such drastic changes in a small amount of time. Regarding my suggestion on new instance creation, don't I have a say on when and how that happens? Or is it totally up to AppEngine to define when a new instance is created? Can I, for example, have 10 instances that are simply waiting for situations like Keakon described? I'm trying to form some intuitive picture of how GAE works by guessing and hoping to be corrected by someone when/if I'm wrong. Maybe I require a cloud platform that allows tinkering at lower levels? On Nov 28, 9:54 pm, Andy Freeman ana...@earthlink.net wrote: Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. What makes you think that the request that causes the creation of a new instance doesn't wait for the creation of said instance? (The scheme you suggest is plausible, but why do you think that it's how appengine works?) On Nov 28, 9:03 am, Eric shel...@gmail.com wrote: Thanks for the response. Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. Also, do you think the latency requirements are realistic with GAE? That is, in the ordinary case, could the response be consistently served back to the querying user with delay of max 3 seconds? On Nov 28, 8:35 am, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak.http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en.-Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this
Re: [google-appengine] Help with an accurate counter with no contention...?
I think there would have to be some divergence between what the counter should be and what the user will actually see at any given time.. since if you have a high rate of counts happening for a user.. you'd get contention when trying to update all the count each time the event being counted happened. Of course, you know that part.. since they have all these sharding examples. So, you gotta decide how stale the count can be... Once you decide that, since you don't seem to want any potential loss of counts... you'd probably need two Models to do counting for each user. (memcache would be out since that allows potential lost counts) One for each individual count inserted (call it UserCounter) and one for the count that the user sees (UserTotalCount). So, if a count-event happens you insert a new row into UserCounter. Then you should have a task that runs that selects __key__ from UserCounter, finds out how many entities were returned, updates the UserTotalCount model with the additional counts, and once that update is successful, it deletes the keys, entities for those counts that it selected. AND then, once all of that is successful, have the Task essentially schedule itself to run again in N seconds or however long you've decided to give it. Presumably, doing it this way would allow you to make sure that the counterupdate task is running one at a time for each user (since it can only start itself up again after it is done counting).. and you would avoid write contention since the task is the only thing updating the user's counter. Probably, you could set up two Expando models to do this for all users.. and each time a new user was created, you'd add a new Column to the Expando models for that user. so, you'd have these initial definitions: class UserCounter(db.Expando): BobCountEvent = db.BooleanProperty(required=True) class UserTotalCount(db.Expando): BobTotalCount = db.IntegerProperty(required=True) Then, each time user Bob has a count event you do: bobCount = UserCounter(BobCountEvent = True) bobCount.put() And when you want to update Bob's Total Count, you do (I have to do this quasi-pseudo since it isn't trivial to do): results = Select __key__ from UserCounter Where BobCountEvent = True If len(results) 0: countResult = Select * from UserTotalCount Where BobTotalCount = 0 if len(countResult) 0: countResult.BobTotalCount += len(results) db.put(countResults) else: newCount = UserTotalCount(BobTotalCount = len(results)) newCount.put() db.delete(results) Now, you might wonder... how do I do puts for variable user names? (You can' t just create new put functions for each new user).. In Python, you can use exec to do that.. I have not tested how any of this performs... having an expando model may hurt performance.. but, I don't think so, and I know the method works for other things (not sure how it'd do on this counter method). See here for Google's sharded counts example: http://code.google.com/appengine/articles/sharding_counters.html On Sat, Nov 28, 2009 at 5:17 PM, peterk peter.ke...@gmail.com wrote: Hey all, I've been looking at the Task Queue API and counter example. In my app, each user will have a couple of counters maintained for them, counting various things. Thing is, these counters need to be accurate. So I'm not sure if the example given for the Task Queue API using memcache would be appropriate for me - it would not be good, really, if my counters were to be inaccurate. My users would expect accurate counts here. So I was thinking about a sort of modified version whereby each change to the counter would be stored in the DS in its own entity. E.g. an entity called 'counter_delta' or some such, which holds the delta to apply to a counter, and the key to the counter that the delta is to be applied to. Then, using the Task Queue I guess I could hoover up all these delta entities, aggregate them, and apply them in one go (or in batches) to the counter. And then delete the delta entries. Thus the task queue is the only thing accessing the counter entity, and it does so in a controllable fashion - so no real contention. Each change to the counter gets written to the store in its own counter_delta entity, so no contention there either. And because the deltas are stored in DS and not in memcache, it should be much more reliable. However, I'm not entirely sure how I should actually go about implementing this, or specifically, the task queue end of things. I'm thinking if there is a change to a counter to be made, I should check if there's a task already running for this counter, and if so, not to do insert any new task, and let the currently running task take care of it. If there is no running task for this counter, I would instead create one, and set it to run in - say - 60 seconds, allowing time for further deltas for this counter to accumulate so the task can take care of more than just one delta. This
[google-appengine] Reference Properties
I was wondering: isn't using reference properties a waste of space? Wouldn't it make more sense to store the id (assuming not using key_name) of the entity. After all, if the Kind is known, one can easily generate the full key based on that. And with a reference property it actually stores the _entire_ key (very long!). Why? -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Help with an accurate counter with no contention...?
To be fair, this method I described may be overkill. I developed it when I was thinking about how to lighten up insert costs to the datastore. I figured that, if one could store some of the relevant information in the Column name (specifically, string info like who's count is this?), that would reduce the total size of the entity.. and thus speed up writes. It was suggested that the performance wouldn't be much different than just having models like this: class UserCounter(db.Model): Username = db.StringProperty(required = True) class UserTotalCount(db.Model): Username = db.StringProperty(required = True) Count = db.IntegerProperty(required = True) Then, you'd just Select __key__ from UserCounter Where Username = 'Bob' and Select * from UserTotalCount Where Username = 'Bob' To do your counting and updating.. Though, my intuition is that doing it this way would take more processing power (and maybe lead to some contention) since you're inserting StringProperties into one big column when putting UserCounter events. Here is the initial thread covering what I was trying to figure out: Expando and Index Partitioninghttp://groups.google.com/group/google-appengine/browse_thread/thread/6210ba5158ec0971/25b09b70ef9b82ff On Sat, Nov 28, 2009 at 6:46 PM, Eli Jones eli.jo...@gmail.com wrote: I think there would have to be some divergence between what the counter should be and what the user will actually see at any given time.. since if you have a high rate of counts happening for a user.. you'd get contention when trying to update all the count each time the event being counted happened. Of course, you know that part.. since they have all these sharding examples. So, you gotta decide how stale the count can be... Once you decide that, since you don't seem to want any potential loss of counts... you'd probably need two Models to do counting for each user. (memcache would be out since that allows potential lost counts) One for each individual count inserted (call it UserCounter) and one for the count that the user sees (UserTotalCount). So, if a count-event happens you insert a new row into UserCounter. Then you should have a task that runs that selects __key__ from UserCounter, finds out how many entities were returned, updates the UserTotalCount model with the additional counts, and once that update is successful, it deletes the keys, entities for those counts that it selected. AND then, once all of that is successful, have the Task essentially schedule itself to run again in N seconds or however long you've decided to give it. Presumably, doing it this way would allow you to make sure that the counterupdate task is running one at a time for each user (since it can only start itself up again after it is done counting).. and you would avoid write contention since the task is the only thing updating the user's counter. Probably, you could set up two Expando models to do this for all users.. and each time a new user was created, you'd add a new Column to the Expando models for that user. so, you'd have these initial definitions: class UserCounter(db.Expando): BobCountEvent = db.BooleanProperty(required=True) class UserTotalCount(db.Expando): BobTotalCount = db.IntegerProperty(required=True) Then, each time user Bob has a count event you do: bobCount = UserCounter(BobCountEvent = True) bobCount.put() And when you want to update Bob's Total Count, you do (I have to do this quasi-pseudo since it isn't trivial to do): results = Select __key__ from UserCounter Where BobCountEvent = True If len(results) 0: countResult = Select * from UserTotalCount Where BobTotalCount = 0 if len(countResult) 0: countResult.BobTotalCount += len(results) db.put(countResults) else: newCount = UserTotalCount(BobTotalCount = len(results)) newCount.put() db.delete(results) Now, you might wonder... how do I do puts for variable user names? (You can' t just create new put functions for each new user).. In Python, you can use exec to do that.. I have not tested how any of this performs... having an expando model may hurt performance.. but, I don't think so, and I know the method works for other things (not sure how it'd do on this counter method). See here for Google's sharded counts example: http://code.google.com/appengine/articles/sharding_counters.html On Sat, Nov 28, 2009 at 5:17 PM, peterk peter.ke...@gmail.com wrote: Hey all, I've been looking at the Task Queue API and counter example. In my app, each user will have a couple of counters maintained for them, counting various things. Thing is, these counters need to be accurate. So I'm not sure if the example given for the Task Queue API using memcache would be appropriate for me - it would not be good, really, if my counters were to be inaccurate. My users would expect accurate counts here. So I was thinking about a sort of modified version whereby each
[google-appengine] Re: Help with an accurate counter with no contention...?
Hey Eli, Thanks very much for your replies. You're thinking along the same lines as me, although I wasn't considering using Expandos to store the data. My concern is sort of independent of this anyway - i'm worried that you can actually have more than one task aggregating changes to a counter running simultaneously. For example, an update is recorded for Bob's counter. How do we know if a task is already running to aggregate Bob's updates? If it's not we want to create one, but if there is already one we don't, because we want to try and avoid multiple tasks running simultaneously for one counter. So we could use a flag to indicate if a task is already running. So before starting a task you could look to see if a flag is set. But there is a window there where two updates could see no flag, and create two tasks, and then create their flag. We could maybe use a transaction to get around this, but then I think (?) we have a point of contention for updates as if we were updating a single counter entity, and we're losing the benefits of all our other work. So then I was thinking we could move that flag to memcache. Which I think might solve our contention issue on the flag using add() etc. However there's then the possibility that the flag could be dropped by memcache prematurely. In that case, a second or third concurrent task for a given counter could be started up. But at least we won't be starting a task up for every update. I was thinking...maybe this isn't a problem to have a few tasks perhaps running concurrently for one counter if we put all our updates for a given counter into a single entity group. Then we could read the update, add it to the aggregation, and delete it in a transaction. So I think then, with a transaction with a delete in it, if another task concurrently tries to process that update, it'll fail. So our updates will only get hoovered up once by one task. I'm not entirely sure if this will be the case though. Will deletion of an entity in a transaction cause another task trying to do the same thing to fail? Obviously in this case we would want that behaviour so we could lock access to a given counter update to one task. On Nov 29, 12:19 am, Eli Jones eli.jo...@gmail.com wrote: To be fair, this method I described may be overkill. I developed it when I was thinking about how to lighten up insert costs to the datastore. I figured that, if one could store some of the relevant information in the Column name (specifically, string info like who's count is this?), that would reduce the total size of the entity.. and thus speed up writes. It was suggested that the performance wouldn't be much different than just having models like this: class UserCounter(db.Model): Username = db.StringProperty(required = True) class UserTotalCount(db.Model): Username = db.StringProperty(required = True) Count = db.IntegerProperty(required = True) Then, you'd just Select __key__ from UserCounter Where Username = 'Bob' and Select * from UserTotalCount Where Username = 'Bob' To do your counting and updating.. Though, my intuition is that doing it this way would take more processing power (and maybe lead to some contention) since you're inserting StringProperties into one big column when putting UserCounter events. Here is the initial thread covering what I was trying to figure out: Expando and Index Partitioninghttp://groups.google.com/group/google-appengine/browse_thread/thread/... On Sat, Nov 28, 2009 at 6:46 PM, Eli Jones eli.jo...@gmail.com wrote: I think there would have to be some divergence between what the counter should be and what the user will actually see at any given time.. since if you have a high rate of counts happening for a user.. you'd get contention when trying to update all the count each time the event being counted happened. Of course, you know that part.. since they have all these sharding examples. So, you gotta decide how stale the count can be... Once you decide that, since you don't seem to want any potential loss of counts... you'd probably need two Models to do counting for each user. (memcache would be out since that allows potential lost counts) One for each individual count inserted (call it UserCounter) and one for the count that the user sees (UserTotalCount). So, if a count-event happens you insert a new row into UserCounter. Then you should have a task that runs that selects __key__ from UserCounter, finds out how many entities were returned, updates the UserTotalCount model with the additional counts, and once that update is successful, it deletes the keys, entities for those counts that it selected. AND then, once all of that is successful, have the Task essentially schedule itself to run again in N seconds or however long you've decided to give it. Presumably, doing it this way would allow you to make sure that the counterupdate task is running one at a time for each
Re: [google-appengine] Re: Help with an accurate counter with no contention...?
Well, it sounds like you're wanting to have the aggregation task fired off when a count event happens for a user. So, then, as you mention, you'd need a way to check if there wasn't already an aggregation task running. And, in the worst case scenario, you could have two tasks get fired off at once.. to aggregate counts.. before the either of the tasks had a chance to set the flag to indicate they were running. You can give the task a name when you add it to the queue.. and once a task exists in the Queue with given name.. you cannot insert a new task using that same name. So, the question becomes, how do you figure out what this Task Name should be..? A quick and dirty guess leads me to think you could do something like. Task Name = AggregateBobCount_ + BobsCurrentTotalCount Thus, you would ensure that no additional tasks were fired off until the current AggregateBobCount_1208 task was done updating the count.. But, then .. as you mention, what about that window between the time that the Aggregator updates the totalCount and flags,deletes the counted counters? If you lock it up with a transaction, will that effect the insertion of other counts for Bob? It might not.. and using a transaction along with Task Names could solve this issue. Another approach is to have the Task NOT be generally fired off anytime a count event is inserted for a User. I think having the Task be configured to be recursive might be the most simple to manage. At the beginning of the day, the initial Aggregator task runs (doing aggregation for all users), once it is done, it adds a new Task to the Queue with a Task Name like I mentioned above (this would cover the extremely random chance that the Task ended up getting created twice somehow), and it sets the delay to 60 seconds or whatever it is that you want. So, the task is chained.. and a new one only runs once an old one is finished. The problem with this approach is... will you be wasting a lot of CPU time by having tasks running for all Users trying to aggregate counts if the users have no counts to aggregate? That's something you'd just have to test to see.. (were you to attempt this method). On Sat, Nov 28, 2009 at 7:45 PM, peterk peter.ke...@gmail.com wrote: Hey Eli, Thanks very much for your replies. You're thinking along the same lines as me, although I wasn't considering using Expandos to store the data. My concern is sort of independent of this anyway - i'm worried that you can actually have more than one task aggregating changes to a counter running simultaneously. For example, an update is recorded for Bob's counter. How do we know if a task is already running to aggregate Bob's updates? If it's not we want to create one, but if there is already one we don't, because we want to try and avoid multiple tasks running simultaneously for one counter. So we could use a flag to indicate if a task is already running. So before starting a task you could look to see if a flag is set. But there is a window there where two updates could see no flag, and create two tasks, and then create their flag. We could maybe use a transaction to get around this, but then I think (?) we have a point of contention for updates as if we were updating a single counter entity, and we're losing the benefits of all our other work. So then I was thinking we could move that flag to memcache. Which I think might solve our contention issue on the flag using add() etc. However there's then the possibility that the flag could be dropped by memcache prematurely. In that case, a second or third concurrent task for a given counter could be started up. But at least we won't be starting a task up for every update. I was thinking...maybe this isn't a problem to have a few tasks perhaps running concurrently for one counter if we put all our updates for a given counter into a single entity group. Then we could read the update, add it to the aggregation, and delete it in a transaction. So I think then, with a transaction with a delete in it, if another task concurrently tries to process that update, it'll fail. So our updates will only get hoovered up once by one task. I'm not entirely sure if this will be the case though. Will deletion of an entity in a transaction cause another task trying to do the same thing to fail? Obviously in this case we would want that behaviour so we could lock access to a given counter update to one task. On Nov 29, 12:19 am, Eli Jones eli.jo...@gmail.com wrote: To be fair, this method I described may be overkill. I developed it when I was thinking about how to lighten up insert costs to the datastore. I figured that, if one could store some of the relevant information in the Column name (specifically, string info like who's count is this?), that would reduce the total size of the entity.. and thus speed up writes. It was suggested that the performance wouldn't be much different than just
Re: [google-appengine] Re: Help with an accurate counter with no contention...?
Though, let me re-iterate... all the round-about stuff I'm talking about is something to consider if you don't want to try and modify the sharded counter technique mentioned in this article: http://code.google.com/appengine/articles/sharding_counters.html http://code.google.com/appengine/articles/sharding_counters.htmlYou'd need some db.Expando model that you used to replace the Memcached counting. And each user could have 20 counters in the model.. And each time a count event happened, you would increment a random counter for that User.. and when you wanted to aggregate, you would get all the counters for that user, add them up and then change the TotalCount to whatever it was you got. I think that might be a worthwhile approach too. On Sat, Nov 28, 2009 at 8:20 PM, Eli Jones eli.jo...@gmail.com wrote: Well, it sounds like you're wanting to have the aggregation task fired off when a count event happens for a user. So, then, as you mention, you'd need a way to check if there wasn't already an aggregation task running. And, in the worst case scenario, you could have two tasks get fired off at once.. to aggregate counts.. before the either of the tasks had a chance to set the flag to indicate they were running. You can give the task a name when you add it to the queue.. and once a task exists in the Queue with given name.. you cannot insert a new task using that same name. So, the question becomes, how do you figure out what this Task Name should be..? A quick and dirty guess leads me to think you could do something like. Task Name = AggregateBobCount_ + BobsCurrentTotalCount Thus, you would ensure that no additional tasks were fired off until the current AggregateBobCount_1208 task was done updating the count.. But, then .. as you mention, what about that window between the time that the Aggregator updates the totalCount and flags,deletes the counted counters? If you lock it up with a transaction, will that effect the insertion of other counts for Bob? It might not.. and using a transaction along with Task Names could solve this issue. Another approach is to have the Task NOT be generally fired off anytime a count event is inserted for a User. I think having the Task be configured to be recursive might be the most simple to manage. At the beginning of the day, the initial Aggregator task runs (doing aggregation for all users), once it is done, it adds a new Task to the Queue with a Task Name like I mentioned above (this would cover the extremely random chance that the Task ended up getting created twice somehow), and it sets the delay to 60 seconds or whatever it is that you want. So, the task is chained.. and a new one only runs once an old one is finished. The problem with this approach is... will you be wasting a lot of CPU time by having tasks running for all Users trying to aggregate counts if the users have no counts to aggregate? That's something you'd just have to test to see.. (were you to attempt this method). On Sat, Nov 28, 2009 at 7:45 PM, peterk peter.ke...@gmail.com wrote: Hey Eli, Thanks very much for your replies. You're thinking along the same lines as me, although I wasn't considering using Expandos to store the data. My concern is sort of independent of this anyway - i'm worried that you can actually have more than one task aggregating changes to a counter running simultaneously. For example, an update is recorded for Bob's counter. How do we know if a task is already running to aggregate Bob's updates? If it's not we want to create one, but if there is already one we don't, because we want to try and avoid multiple tasks running simultaneously for one counter. So we could use a flag to indicate if a task is already running. So before starting a task you could look to see if a flag is set. But there is a window there where two updates could see no flag, and create two tasks, and then create their flag. We could maybe use a transaction to get around this, but then I think (?) we have a point of contention for updates as if we were updating a single counter entity, and we're losing the benefits of all our other work. So then I was thinking we could move that flag to memcache. Which I think might solve our contention issue on the flag using add() etc. However there's then the possibility that the flag could be dropped by memcache prematurely. In that case, a second or third concurrent task for a given counter could be started up. But at least we won't be starting a task up for every update. I was thinking...maybe this isn't a problem to have a few tasks perhaps running concurrently for one counter if we put all our updates for a given counter into a single entity group. Then we could read the update, add it to the aggregation, and delete it in a transaction. So I think then, with a transaction with a delete in it, if another task concurrently tries to process that update, it'll fail. So
Re: [google-appengine] Re: Help with an accurate counter with no contention...?
oh, and duh.. the first part of that article does the sharded counting.. using transactions without memcached. So, presumably, it should do exactly what you want. you just need to modify that to allow counting for an arbitrary number of users. On Sat, Nov 28, 2009 at 8:30 PM, Eli Jones eli.jo...@gmail.com wrote: Though, let me re-iterate... all the round-about stuff I'm talking about is something to consider if you don't want to try and modify the sharded counter technique mentioned in this article: http://code.google.com/appengine/articles/sharding_counters.html http://code.google.com/appengine/articles/sharding_counters.htmlYou'd need some db.Expando model that you used to replace the Memcached counting. And each user could have 20 counters in the model.. And each time a count event happened, you would increment a random counter for that User.. and when you wanted to aggregate, you would get all the counters for that user, add them up and then change the TotalCount to whatever it was you got. I think that might be a worthwhile approach too. On Sat, Nov 28, 2009 at 8:20 PM, Eli Jones eli.jo...@gmail.com wrote: Well, it sounds like you're wanting to have the aggregation task fired off when a count event happens for a user. So, then, as you mention, you'd need a way to check if there wasn't already an aggregation task running. And, in the worst case scenario, you could have two tasks get fired off at once.. to aggregate counts.. before the either of the tasks had a chance to set the flag to indicate they were running. You can give the task a name when you add it to the queue.. and once a task exists in the Queue with given name.. you cannot insert a new task using that same name. So, the question becomes, how do you figure out what this Task Name should be..? A quick and dirty guess leads me to think you could do something like. Task Name = AggregateBobCount_ + BobsCurrentTotalCount Thus, you would ensure that no additional tasks were fired off until the current AggregateBobCount_1208 task was done updating the count.. But, then .. as you mention, what about that window between the time that the Aggregator updates the totalCount and flags,deletes the counted counters? If you lock it up with a transaction, will that effect the insertion of other counts for Bob? It might not.. and using a transaction along with Task Names could solve this issue. Another approach is to have the Task NOT be generally fired off anytime a count event is inserted for a User. I think having the Task be configured to be recursive might be the most simple to manage. At the beginning of the day, the initial Aggregator task runs (doing aggregation for all users), once it is done, it adds a new Task to the Queue with a Task Name like I mentioned above (this would cover the extremely random chance that the Task ended up getting created twice somehow), and it sets the delay to 60 seconds or whatever it is that you want. So, the task is chained.. and a new one only runs once an old one is finished. The problem with this approach is... will you be wasting a lot of CPU time by having tasks running for all Users trying to aggregate counts if the users have no counts to aggregate? That's something you'd just have to test to see.. (were you to attempt this method). On Sat, Nov 28, 2009 at 7:45 PM, peterk peter.ke...@gmail.com wrote: Hey Eli, Thanks very much for your replies. You're thinking along the same lines as me, although I wasn't considering using Expandos to store the data. My concern is sort of independent of this anyway - i'm worried that you can actually have more than one task aggregating changes to a counter running simultaneously. For example, an update is recorded for Bob's counter. How do we know if a task is already running to aggregate Bob's updates? If it's not we want to create one, but if there is already one we don't, because we want to try and avoid multiple tasks running simultaneously for one counter. So we could use a flag to indicate if a task is already running. So before starting a task you could look to see if a flag is set. But there is a window there where two updates could see no flag, and create two tasks, and then create their flag. We could maybe use a transaction to get around this, but then I think (?) we have a point of contention for updates as if we were updating a single counter entity, and we're losing the benefits of all our other work. So then I was thinking we could move that flag to memcache. Which I think might solve our contention issue on the flag using add() etc. However there's then the possibility that the flag could be dropped by memcache prematurely. In that case, a second or third concurrent task for a given counter could be started up. But at least we won't be starting a task up for every update. I was thinking...maybe this isn't a problem to have a few tasks perhaps
[google-appengine] Re: Newly registered App doesn't appear in App Engine Administrator Console
Are you an Apps user (ie. /a/mydomain.com) as opposed to a gmail.com user? On Nov 27, 6:55 pm, mika-vienna mka...@deepsec.net wrote: Hi all, I'm new to Google Apps and Wave, experimenting with Wave Bots I registered my first App with SMS verification and it doesn't appear in my Administrator Console (https://appengine.google.com/start) like described. When I try to repeat the steps (with the same App ID) I get an error message App or User already exists Using Firefox 3.0 Any clue? regards, MiKa -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Re: GAE for CPU intensive time important application
2009/11/29 Eric shel...@gmail.com: Thanks for all your comments. Regarding Python/Java speed, 99% of the runtime is spent iterating in an attempt to converge to some numerical solution . Loops, arithmetic and memory updates. I would guess an interpreted language like Python (am I right?) would be much slower. You can try a simulation test before your decision. About the instance set up time, I agree that if query frequency suddenly rises from 100/sec to 200/sec the system I suggested would stall, but I'm don't think I'm expecting such drastic changes in a small amount of time. Regarding my suggestion on new instance creation, don't I have a say on when and how that happens? Or is it totally up to AppEngine to define when a new instance is created? Can I, for example, have 10 instances that are simply waiting for situations like Keakon described? At least not right now, It's up to the app master. http://code.google.com/events/io/2009/sessions/FromSparkPlugToDriveTrain.html I'm trying to form some intuitive picture of how GAE works by guessing and hoping to be corrected by someone when/if I'm wrong. Maybe I require a cloud platform that allows tinkering at lower levels? On Nov 28, 9:54 pm, Andy Freeman ana...@earthlink.net wrote: Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. What makes you think that the request that causes the creation of a new instance doesn't wait for the creation of said instance? (The scheme you suggest is plausible, but why do you think that it's how appengine works?) On Nov 28, 9:03 am, Eric shel...@gmail.com wrote: Thanks for the response. Maybe I don't understand something, but why should the 5 second setup on a new instance bother me? A new instance should be created when other instances are near capacity, and not when they exceed it, right? So once initialized it can be dummy-run internally and only available 5 seconds later while the existing instance continue to take care of the incoming queries. Also, do you think the latency requirements are realistic with GAE? That is, in the ordinary case, could the response be consistently served back to the querying user with delay of max 3 seconds? On Nov 28, 8:35 am, 风笑雪 kea...@gmail.com wrote: The White House hosted an online town hall meeting on GAE with GWT, and received 700 hits per second at its peak.http://google-code-updates.blogspot.com/2009/04/google-developer-prod... But more than 1000 queries a second is never been tested. I think Java is not a good choice in your case. When your user suddenly increasing, starting a new Jave instance may cost more than 5 seconds, while Python needs less than 1 second. 2009/11/27 Eric shel...@gmail.com: Hi, I wish to set up a CPU-intensive time-important query service for users on the internet. Is GAE with Java the right choice? (as compared to other clouds, or non-cloud architecture) Specifically, in terms of: 1) pricing 2) latency resulting from slow CPU, JIT compiles, etc.. 3) latency resulting from communication of processes inside the cloud (e.g. a queuing process and a calculation process) 4) latency of communication between cloud and end user A usage scenario I am expecting is: - a typical user sends a query (XML of size around 1K) once every 30 seconds on average, - Each query requires a numerical computation of average time 0.2 sec and max time 1 sec (on a 1 GHz Pentium). The computation requires no data other than the query itself. - The delay a user experiences between sending a query and receiving a response should be on average no more than 2 seconds and in general no more than 5 seconds. - A background save to a DB of the response should occur (not time critical) - There can be up to 3 simultaneous users - i.e., on average 1000 queries a second, each requiring an average 0.2 sec calculation, so that would necessitate around 200 CPUs. Is this feasible on GAE Java? If so, where can I learn about the correct design methodology for such a project on GAE? If this is the wrong forum to ask this, I'd appreciate redirection. Thanks, Eric -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/google-appengine?hl=en.-Hide quoted
Re: [google-appengine] Re: GAE for CPU intensive time important application
On Sat, Nov 28, 2009 at 5:13 PM, Eric shel...@gmail.com wrote: Another question, you both recommended Python for some of its features, but isn't Python much slower than Java? So wouldn't that necessitate many more instances/CPUs to keep with the query load? Yes, the python VM is slower than JVM. Python dev and prototyping time however amazingly faster and less frustrating. I recommend anybody avoid xml and use beautiful yaml whenever able. Both py and java can use just function or static method which won't create instance, very fast and no proof here you can't do everything in Java with static methods or likewise python withno classas, just functions. Example advance python phonetic algorithm, just a function, no class http://atomboy.isa-geek.com/plone/Members/acoil/programing/double-metaphone/metaphone.py/at_download/file or a snippet I posted in python than will be a mess in java, 23 rows in python refactorable to half http://www.djangosnippets.org/snippets/1821/ good luck Niklas (montao.googlecode.com) -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
Re: [google-appengine] Reference Properties
On Sun, Nov 29, 2009 at 12:09 AM, MajorProgamming sefira...@gmail.com wrote: I was wondering: isn't using reference properties a waste of space? Wouldn't it make more sense to store the id (assuming not using key_name) of the entity. After all, if the Kind is known, one can easily generate the full key based on that. And with a reference property it actually stores the _entire_ key (very long!). Why? We do waste space to quicken dev time and rapid prototyping. I call it a tradeoff, know ways to easy storage use several halves that view won't react to, making 100 created object 50 and 25 etc, priotitizing security, stability and views top, optimizations last. -- You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
