Re: [appengine-java] Re: Javaland scheduler behavior

[Francois MASUREL]

Yep noticed that too since a few days.

But no good explanations for the moment.

François


On Tue, Feb 28, 2012 at 18:25, Jeff Schnitzer  wrote:

> Thanks for the link.  This doesn't directly address the main point I'm
> worried about though:
>
>  * Why does any user-facing request ever sit in the pending queue for an
> instance that is warming-up when there is a perfectly good instance sitting
> there?
>
> My problem is not that GAE is spinning up new instances.  My problem is
> that users are waiting for it.  There's an instance sitting there with a
> low wait time in the pending queue - why is GAE shunting new requests to
> instances with an effective 10-20s wait time instead?
>
> Jeff
>
> On Tue, Feb 28, 2012 at 12:00 PM, Francois Masurel wrote:
>
>> Hi Jeff,
>>
>> Check this post :
>> https://groups.google.com/forum/#!msg/google-appengine/3t5muVhXajg/SSFU-udjIhwJ
>>
>>
>> Setting "Idle instances" to automatic, as Johan Euphrosine suggested,
>> seems to have solved the problem, at least temporarily (I was at 1 minimum
>> and 1 maximum before).
>>
>> I'm just a bit scared now to get over my daily quotas.
>>
>> François
>>
>>
>> On Tuesday, February 28, 2012 5:34:36 PM UTC+1, Jeff Schnitzer wrote:
>>>
>>> There's been a lot of discussion of the scheduler behavior in
>>> Pythonland, but not much about it's "eccentricities" in Javaland.
>>>
>>> I have a threadsafe=true Java app.  Let's say every request completes in
>>> exactly 1s.  Settings are:  idle instances min 1 max 1, latency auto/auto.
>>>Here is what I expect:
>>>
>>>  * Instance1 starts up and becomes permanently resident
>>>  * Instance1 serves concurrent requests up to some arbitrary CPU capcity
>>>  * When Instance1 exceeds capacity:
>>>  * Instance2 starts warming up
>>>  * All requests remain in the pending queue for Instance1, getting
>>> processed at 1/s * concurrency
>>>  * Instance2 is ready and starts processing new requests, sharing
>>> the load with Instance1
>>>
>>> What I actually see (as far as I can determine):
>>>
>>>  * Instance1 starts up and becomes permanently resident
>>>  * Instance1 supports almost no concurrency.  At most it's 2.  (no, my
>>> app is not particularly compute intensive)
>>>  * A new request comes in which for some reason can't be handled by
>>> Instance1:
>>>  * Instance2 starts warming up
>>>  * The new request is blocked on Instance2's pending queue, waiting
>>> 10-20s for Instance2 to be ready
>>>  * In the mean time, Instance1 is actually idle
>>>  * Another new request comes in and starts up Instance3
>>>  * Possibly this is while Instance2 is warming up
>>>  * AFAICT, Instance1 is taking a coffee break
>>>
>>> The net result is that I have an idle website with 1 user (me) clicking
>>> around and I've already gotten multiple 20s pauses and three instances.
>>>  Something is seriously wrong here.  Whether or not it's rational to have
>>> so many instances started, pending requests shouldn't be shunted to
>>> non-warmed-up servers, right?
>>>
>>> I've tried upping the min latency to a high value to see if this
>>> improves the situation.  If this works... shouldn't min latency *always* be
>>> as high as the startup time for an instance?
>>>
>>> I know it's been said before, but it needs to be said again... the
>>> guidance for scheduler configuration is really, really inadequate.
>>>
>>> Jeff
>>>
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[appengine-java] Re: Javaland scheduler behavior

[Francois Masurel]

Hi Jeff,

Check this post :  
https://groups.google.com/forum/#!msg/google-appengine/3t5muVhXajg/SSFU-udjIhwJ
 

Setting "Idle instances" to automatic, as Johan Euphrosine suggested, seems 
to have solved the problem, at least temporarily (I was at 1 minimum and 1 
maximum before).

I'm just a bit scared now to get over my daily quotas.

François

On Tuesday, February 28, 2012 5:34:36 PM UTC+1, Jeff Schnitzer wrote:
>
> There's been a lot of discussion of the scheduler behavior in Pythonland, 
> but not much about it's "eccentricities" in Javaland.
>
> I have a threadsafe=true Java app.  Let's say every request completes in 
> exactly 1s.  Settings are:  idle instances min 1 max 1, latency auto/auto. 
>Here is what I expect:
>
>  * Instance1 starts up and becomes permanently resident
>  * Instance1 serves concurrent requests up to some arbitrary CPU capcity
>  * When Instance1 exceeds capacity:
>  * Instance2 starts warming up
>  * All requests remain in the pending queue for Instance1, getting 
> processed at 1/s * concurrency
>  * Instance2 is ready and starts processing new requests, sharing the 
> load with Instance1
>
> What I actually see (as far as I can determine):
>
>  * Instance1 starts up and becomes permanently resident
>  * Instance1 supports almost no concurrency.  At most it's 2.  (no, my app 
> is not particularly compute intensive)
>  * A new request comes in which for some reason can't be handled by 
> Instance1:
>  * Instance2 starts warming up
>  * The new request is blocked on Instance2's pending queue, waiting 
> 10-20s for Instance2 to be ready
>  * In the mean time, Instance1 is actually idle
>  * Another new request comes in and starts up Instance3
>  * Possibly this is while Instance2 is warming up
>  * AFAICT, Instance1 is taking a coffee break
>
> The net result is that I have an idle website with 1 user (me) clicking 
> around and I've already gotten multiple 20s pauses and three instances. 
>  Something is seriously wrong here.  Whether or not it's rational to have 
> so many instances started, pending requests shouldn't be shunted to 
> non-warmed-up servers, right?
>
> I've tried upping the min latency to a high value to see if this improves 
> the situation.  If this works... shouldn't min latency *always* be as high 
> as the startup time for an instance?
>
> I know it's been said before, but it needs to be said again... the 
> guidance for scheduler configuration is really, really inadequate.
>
> Jeff
>

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[appengine-java] Re: Datastore Admin and federated login

[Francois Masurel]

In fact, it seems that my browser blocked the openid url for some security 
reasons related to being in an iframe.

I just had to open this url in a new tab to solve the problem.

Francois

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Re: [appengine-java] Re: OpenId Provider using java

[Francois MASUREL]

You are supposed to have something like this in your application web.xml :

 
 providerServlet
 /authenticate
 
http://code.google.com/p/joid/source/browse/trunk/examples/openid-provider/src/main/webapp/WEB-INF/web.xml




On Wed, Feb 1, 2012 at 14:12, TG  wrote:

> I tried to create a project with the example of openid-provider in
>
> http://code.google.com/p/joid/source/browse/#svn%2Ftrunk%2Fexamples%2Fopenid-provider
>
> but I got the error *The requested resource (/authenticate) is not
> available.*
> in *http://localhost:8080/authenticate*
> *
> *
> What I have to do?
> Do I ha to do the server installation?
> http://code.google.com/p/joid/wiki/ServerInstallation
> *
> *
> I'm running on Tomcat in Eclipse.
> *
> *
> *
> *
>
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[appengine-java] Datastore Admin and federated login

[Francois Masurel]

The datastore admin doesn't seem to be working with Federated login :

Error: Not FoundThe requested URL 
/_ah/login_required?continue=http://ah-builtin-python-bundle-dot-latest-dot-vncts1.appspot.com/_ah/datastore_admin/
 was 
not found on this server.

Anyone knows if this will be fixed anytime soon?

Thanx for your help.

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[appengine-java] Re: OpenId Provider using java

[Francois Masurel]

I've successfully built an OpenId provider on GAE Java using this project 
as a starting point :

http://code.google.com/p/joid/ 

I added some connectors to enable users to log in using their social 
networks accounts (Twitter, Facebook, Foursquare, LinkedIn, etc.) as well 
as Mozilla BrowserId.

Francois

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[appengine-java] Re: AppEngine JVM Memory queries

[Francois Masurel]

I would also like to have more detailled information about memory usage in 
the administration console.

The memory counter keeps increasing constantly for one of my app (vncts1). 
 It looks like I'm being hit by a memory leak.

But when I profile my app locally on the dev server, there is no such 
memory usage increase, it stays quite stable at about 25 MB.

On GAE my app memory usage can go up to 120 MB for my resident instance in 
less than one day.

Any help will be greatly appreciated.

François

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[appengine-java] Re: GAE app completely down for over an hour due to com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Error setting single item

[Francois Masurel]

Yep, we got struck by the same outage for about 30 minutes yesterday.

It's clear that we need to manage such exceptions in our code, we were not 
prepared for that.

But it would be interesting to have some information from Google about what 
happened exactly.

Francois


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[appengine-java] Re: HELP PLEASE! Bug!

[Francois Masurel]

Hi Bruno,

I don't think it's related to AppEngine.

I've found this after a quick search on Google :

"It means that you compiled your classes under a specific JDK, but then try 
to run them under older version of JDK. So, you can't run classes compiled 
with JDK 6.0 under JDK 5.0. The same with classes compiled under JDK 7.0 
when you try to run them under JDK 6.0."

Hoping it will help.

Francois

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[appengine-java] Re: .A research: how long will your java app instance start up fully?

[Francois Masurel]

Between 5s and 10s, about 10s most of the time.

Using quite a few libraries, but no spring, struts or other heavy MVC 
framework.

Francois

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[appengine-java] Re: Asynchronous sessions enabled and deferred task error - ClassNotFoundException

[Francois Masurel]

Same for me.  Just disabled async sessions for the moment.

Francois

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[appengine-java] Re: sending pdf

[Francois Masurel]

Hi Vik,

I'm using PDFJet to generate simple PDFs on GAE/Java.

Francois

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[appengine-java] Re: Strange datastore exception

[Francois Masurel]

Hi Daniel,

Datastore entity keys include the app name.

I guess you moved your content from a M/S to a HR app without updating the 
keys.

You cannot access data belonging to another app for security reasons.

Francois

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[appengine-java] Re: threads per instance (Java)

[Francois Masurel]

I just asked a similar question here : 
http://code.google.com/p/googleappengine/issues/detail?id=5414#c31

You might want to file a documentation bug.

Francois

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[appengine-java] Re: Always On not working properly

[Francois Masurel]

Yep same here, lots of warmup requests and slow responses to users.  Quite 
costly CPU wise too.

Really annoying.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

Hi Don,

I was just wondering : could these buggy DeadlineExceededExceptions cause a 
memory leak ?

I've seen my instance take up to 134MB just running 2 simple datastore 
queries (DeadlineExceededException) every minute.

Do you know when will the next SDK version be released ?

BTW, it looks like I get these deadline exceptions every 500 datastore api 
calls, quite far from the every 3000 announced. 

Thanx for your help.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

Happy to be able to help.

In fact, I just put in place all this catches to avoid instance restart 
which causes lots of error 500 and get my site unreachable for a few seconds 
each time it happens.

Do you mean that all these strange DeadlineExceededExceptions will disappear 
with next SDK version ?

Thanx for all.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

The faulty instance was restarted so everything went back to normal.

I just flushed my cache and reloaded about 20 pages to reproduce the bug.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois MASUREL]

Hi Don,

My appId is : vncts1

It's bugging at the moment.

Thanx  for your help.

Francois



On Fri, May 20, 2011 at 18:31, Don Schwarz  wrote:

> This is very strange.  What is your app id?
>
> On Fri, May 20, 2011 at 7:55 AM, Francois Masurel wrote:
>
>> And here is how it goes when everything is normal... (cf. attachment)
>>
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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

If anyone interested at Google, I can reproduce this strange behavior quite 
easily.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

I just found something rather strange :

After setting a 10 seconds deadline on my datastore service and setting a 
page reload when deadline exceptions are thrown, I got caught in an infinite 
loop : pages were reloading for several minutes until a background task 
using a datastore service without deadline caused an instance restart.

And no new instance were created during all this time, this quite suprised 
me.

These pages load in less than 400ms in normal conditions.

There is definitely something going wrong.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

I've been able to lower the impact of these datastore 
DeadlineExceededException by setting a global datastore deadline using :

http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/DatastoreServiceConfig.html

I just catch the ApiProxy$ApiDeadlineExceededException being thrown and 
reload the page using a redirect. It works ok.

But sadly, there doesn't seem to be a way to do the same thing for deadline 
exceptions thrown during Jetty session loading, I'm stuck.

I really want to avoid these annoying instance restarts that kill my 
application.

Any help will be greatly appreciated.

Francois

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Re: [appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

Hi Don,

Thanx for your answer.

Actually I'm testing an HR application and I get these errors quite often on 
load increase.

Could you explain why datastore entity are unavailable periodically ?  And 
why we have to wait 30s to know that these entities are unavailable ?

What is really annoying is that when an instance is restarted all pending 
requests/threads are also stopped which results in a lot of additionnal 
errors.  And when you had only one instance running, all further requests 
throw 500 errors while we are waiting for a new instance to be started.

I really hope you'll find a more optimal way to manage 
DeadlineExceededException.

I've filed a bug : 
http://code.google.com/p/googleappengine/issues/detail?id=5066

Thanx again for your help.

Francois


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[appengine-java] DeadlineExceededException on Jetty session loading

[Francois Masurel]

Hey Googlers,

Do you know why we get these DeadlineExceededException when Jetty's trying 
to load session data from the datastore ?

It looks like a bug as there is only Google App Engine code being executed 
here (see stacktrace below).

And (still haven't got an answer about that) why does it have to kill and 
restart the instance when such exceptions occurs ?  Doesn't seem to be 
optimal in threadsafe mode.

Thanx for your help.

Francois


   1. 2011-05-17 02:00:14.483
   
   Nested in javax.servlet.ServletException: 
com.google.apphosting.api.DeadlineExceededException: This request 
(fb27bd896bd3c1f8) started at 2011/05/17 08:59:44.654 UTC and was still 
executing at 2011/05/17 09:00:14.465 UTC.:
   com.google.apphosting.api.DeadlineExceededException: This request 
(fb27bd896bd3c1f8) started at 2011/05/17 08:59:44.654 UTC and was still 
executing at 2011/05/17 09:00:14.465 UTC.
at sun.misc.Unsafe.park(Native Method)
at 
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)
at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1326)
at 
com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:232)
at 
com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:69)
at 
com.google.appengine.tools.development.TimedFuture.get(TimedFuture.java:41)
at 
com.google.common.util.concurrent.ForwardingFuture.get(ForwardingFuture.java:64)
at 
com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:67)
at 
com.google.appengine.api.datastore.FutureHelper$CumulativeAggregateFuture.get(FutureHelper.java:136)
at 
com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:71)
at 
com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:32)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl$1.runInternal(DatastoreServiceImpl.java:78)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl$1.runInternal(DatastoreServiceImpl.java:75)
at 
com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:31)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:75)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:62)
at 
com.google.apphosting.runtime.jetty.SessionManager.loadSession(SessionManager.java:318)
at 
com.google.apphosting.runtime.jetty.SessionManager.getSession(SessionManager.java:288)
at 
org.mortbay.jetty.servlet.AbstractSessionManager.getHttpSession(AbstractSessionManager.java:237)
at 
org.mortbay.jetty.servlet.SessionHandler.setRequestedId(SessionHandler.java:246)
at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:136)
at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at 
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at 
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at 
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135)
at 
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:260)
at 
com.google.apphosting.base.RuntimePb$EvaluationRuntime$2.handleRequest(RuntimePb.java:9669)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:439)
at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:573)
at 
com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448)
at com.google.tracing.TraceContext.runInContext(TraceContext.java:688)
at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326)
at 
com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318)
at 
com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446)
at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:

[appengine-java] Java instances memory usage

[Francois Masurel]

Hi everybody,

I would like to know how much memory space do your Java instances use. 
 Mines use from 75 to 90 MB of memory on average basis.

Future billing rules might make these numbers more important than they are 
today.

Thanx for your help.

Francois

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[appengine-java] DeadlineExceededException and instance restart

[Francois Masurel]

Why do DeadlineExceededException always cause an instance restart even if 
properly catched ?

My instances are quite slow to start since 1.5.0 and I get a lot of errors 
500 then.

Thanx for your help.

François

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Re: [appengine-java] warmup requests going crazy (9850 requests in 15 hours)

[Francois Masurel]

I have a problem that might be related.

It looks like my "Always On" instances are restarted when traffic increase 
which gives me quite a few 500 errors.

Could it be related to the new "threadsafe" mode ?


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[appengine-java] Re: Backup & restore of my app - Is this really a joke or am I missing something?

[Francois Masurel]

You might be interested in this issue :

http://code.google.com/p/googleappengine/issues/detail?id=776

Francois

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Re: [appengine-java] Re: is it possible to use Java 7 on GAE ?

[Francois Masurel]

Ok, Ikai, thanx for your answer.

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Re: [appengine-java] Re: is it possible to use Java 7 on GAE ?

[Francois Masurel]

Hi Ikai,

Does this mean that GAE Java won't be supported when Java 1.6 will be 
deprecated (I guess we have some time) ?

Thanx for your answers.

Francois

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[appengine-java] Re: My site is very latency now, even if 3 "always on" instances are running.

[Francois Masurel]

Yep, same for me, and quite a few datastore timeouts.  Annoying.

Francois

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[appengine-java] Re: Datastore Backup and Restore (for Java)

[Francois Masurel]

Actually there is a problem is you store content keys as string in the 
datastore.
They can't be imported back in another application because keys are 
"application prefixed".
I was hit by this problem and I'm still stuck to my old application that I 
can't rename.

I think GAE really miss an easy to use backup/restore tool.
I know that it's probably quite complex to implement though.

You can star this issue :  
http://code.google.com/p/googleappengine/issues/detail?id=776

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[appengine-java] Re: Files Limitation 3000

[Francois Masurel]

Hi Ravi,

I'm putting all the generated GWT files in a zip file and I'm serving
them with a specific servlet.

It works fine and even allows me to do some GWT versioning : ///

Remember that, if you change the default GWT module path (like adding
a version number in it), you need to override the
RemoteServiceServlet#doGetSerializationPolicy method.

Francois

On 12 déc, 22:55, Ravi  wrote:
> Hello,
>
> After adding ExtJS GWT, the files count went to about 3500 after
> compilation.
> I am unable to deploy the project as GAE has a limit of 3000.
> I can put the java classes in JAR file, but the what can I do about
> the static files ?
> How can I overcome this problem ?
>
> Thanks,
> Ravi

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[appengine-java] Re: How can i store an image to a blobstore without using a form?

[Francois Masurel]

It looks like it's on the roadmap now : "Programatic Blob creation in
Blobstore"

http://code.google.com/appengine/docs/roadmap.html

Francois

On Nov 21, 5:09 pm, Max <6738...@gmail.com> wrote:
> I would like to do this also.  I am currently storing files as byte[] but I 
> receive corrupted files about 5% of the time and it is seemingly random.  I'm 
> using Objectify and I think it translates the byte[] to a Blob but doesn't 
> use the Blobstore.
>
> I believe it would be possible using the Apache HTTP library (or URL Fetch).  
> I use the Apache library to POST a file to a URL and retrieve the response.  
> See below.  If anyone has sample code, that would be great.
>
> thx
> MG
>
> HttpParams params = new BasicHttpParams();
> HttpClient httpClient = new DefaultHttpClient(new GAEConnectionManager(), 
> params);
> HttpPost post = new 
> HttpPost("https://www.ocrterminal.com/api/submit.cgi?version=1.0&username=&...";);
> HttpProtocolParamBean paramsBean = new HttpProtocolParamBean(params);
> paramsBean.setUserAgent("APIClient:bdrenv");
> post.setParams(params);
> MultipartEntity mpEntity = new 
> MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
> mpEntity.addPart("upload", new InputStreamKnownSizeBody(new 
> ByteArrayInputStream(body), body.length, contentType, filename));
> post.setEntity(mpEntity);
> HttpResponse response = httpClient.execute(post);
> HttpEntity entity = response.getEntity();
> String responseString = EntityUtils.toString(entity);
>
> On Nov 21, 2010, at 8:52 AM, acellam guy wrote:
>
>
>
>
>
>
>
> > is it possible???
>
> > --
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[appengine-java] Cold starts taking longer since recent update ?

[Francois Masurel]

Hi everbody,

Has anyone noticed that cold starts seems to last quite longer than
usual recently ?

Some of my cold starts that were about 3 to 4 seconds before are now
up to 10 seconds.

Sometimes I get them while navigating from one page to another.  Quite
annoying.

I'm supposed to go in production before year end, will reserved
instances be available by that date ?

Thanx for your help.

Francois

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[appengine-java] Re: 500 Server Error (Dashboard)

[Francois Masurel]

And the latency is not so good today :

http://code.google.com/status/appengine/detail/serving-java/2010/11/12#ae-trust-detail-helloworld-get-java-latency

Some of my pages are suddenly loading very slowly without any reason
(and no cold start going on).

Quite annoying as I was doing a demo to an important potential user.

Francois

On Nov 12, 11:28 am, heros  wrote:
> Yes, I'm too. But I can log in if trying some times.
> Google may be maintaining their server.
>
> Hung
>
> On Nov 12, 4:51 pm, rsutaria  wrote:
>
>
>
>
>
>
>
> > ++1. Any idea when will it be resolved?
>
> > On Nov 12, 2:28 pm, Nikhil Aggarwal 
> > wrote:
>
> > > I am getting the following 500 Server Error message while trying to
> > > login to appengine.google.com to view the admin panel:
>
> > > Error: Server Error
>
> > > The server encountered an error and could not complete your request.
> > > If the problem persists, please report your problem and mention this
> > > error message and the query that caused it.

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[appengine-java] Re: Does AppEngine recycle threads (Is using ThreadLocal considered good practice on the GAE?)

[Francois Masurel]

Each app instance runs in its own JVM.  So it should be safe to cache
data in ThreadLocal.

On 16 sep, 09:08, Maxim Veksler  wrote:
> I would like to cache a not thread safe object, I'm hoping to improve
> performance by caching it instead of instantiating new instance per request.
>
> Thanks,
> Maxim.
>
> On Thu, Sep 16, 2010 at 8:12 AM, Guillaume Laforge wrote:
>
>
>
> > What kind of data or information do you want to share through thread-locals
> > between threads/requests?
>
> > On Thu, Sep 16, 2010 at 08:04, Maxim Veksler  wrote:
>
> >> I didn't say multi threaded.
>
> >> ThreadLocal gives access to the cached object of the current thread.
> >> I'm doing an assumption here that appengine/j is implemented with thread
> >> per incoming request.
>
> >> What I would like to know is if these threads are recycled (in which case
> >> ThreadLocal is a good approach) or not.
>
> >> Thanks,
> >> Maxim.
>
> >> On Thu, Sep 16, 2010 at 6:17 AM, Didier Durand 
> >> wrote:
>
> >>> Hi Maxim,
>
> >>> Multi-threading is not the way to go under GAEJ, see
> >>>http://code.google.com/appe
>
> >> *I didn't say multi threaded. *
>
> >> ngine/docs/java/runtime.html#The_Sandbox
>
> >>> The right way to go is Tasks:
> >>>http://code.google.com/appengine/docs/java/taskqueue/overview.html
>
> >>> regards
>
> >>> didier
>
> >>> On Sep 15, 2:00 pm, Maxim Veksler  wrote:
> >>> > Hello,
>
> >>> > I'm wondering (after some internal discussion we had) is using
> >>> ThreadLocal
> >>> > for applications running on the AppEngine is performance beneficial ?
>
> >>> > For this to work AppEngine should recycle threads, right?
>
> >>> > Another question is how many threads does the appengine allows per JVM
> >>> ?
> >>> > Such ThreadLocal based approach would (probably) be inefficient if the
> >>> JVM
> >>> > allowed 2 threads.
>
> >>> > Help is appreciated.
> >>> > Maxim.
>
> >>> --
> >>> You received this message because you are subscribed to the Google Groups
> >>> "Google App Engine for Java" group.
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> >>> google-appengine-j...@googlegroups.com.
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> >>> .
> >>> For more options, visit this group at
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>
> >>  --
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> >> .
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>
> > --
> > Guillaume Laforge
> > Groovy Project Manager
> > Head of Groovy Development at SpringSource
> >http://www.springsource.com/g2one
>
> > --
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[appengine-java] Re: time triggered tasks

[Francois Masurel]

It looks like you can delay tasks via API :

 TaskOptionscountdownMillis(long countdownMillis)
  Set the number of milliseconds delay before execution of the
task.
 TaskOptionsetaMillis(long etaMillis)
  Sets the approximate absolute time to execute.

I also found a link : 
http://efreedom.com/Question/1-1049054/Task-Queue-API-ETA-Countdown

I have not tested it though.

Francois

On 9 sep, 05:29, Hariharan Anantharaman
 wrote:
> Hi,
> Are you planning to have all users authenticated only using google accounts?
> If so, you can see if you can use google calendar. Just a thought. That
> might help you to acheieve few things out of box.
>
> ~hari
>
> On Sep 9, 2010 4:56 AM, "Marco Alves"  wrote:
>
> Hi Didier. Thanks for your input.
>
> I was hoping that it would be possible to schedule each task with an
> execution date. With that information, GAE would execute the task on
> the execution date, very much like an alarm clock.
>
> I guess I'll have to implement a cron job at a regular interval and
> use the task queues as you mentioned.
>
> On Sep 5, 4:56 pm, Didier Durand  wrote: > Hi
> marco, > > One solution to t...

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[appengine-java] Re: can we use Web-services in Gooogle app engine

[Francois Masurel]

I've successfully used some SOAP Services using the WSC library :
http://code.google.com/p/sfdc-wsc/

Francois

On 3 sep, 10:27, moissinac  wrote:
> No true/false response possible.
>
> 1) Response time: if a GAE application calls web services, each call
> must be ended in the limited response time offered by Google; so if
> there is some delay in the response of the called web service, you
> need to manage this finely; it could be a bit complex
>
> 2) Web service framework: if you implement web services by using a
> framework/library (Axis,...), it's possible/common that the framework
> uses a database and so that the framework is not directly compatible
> with GAE
>
> But, it's POSSIBLE to implement anf use web services with GAE

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[appengine-java] Re: Google app engine database backup java

[Francois Masurel]

You might also want to star the following issue :
http://code.google.com/p/googleappengine/issues/detail?id=776

On Aug 31, 12:09 pm, Frederik Pfisterer  wrote:
> http://code.google.com/intl/de-DE/appengine/docs/python/tools/uploadi...
>
> On 30 Aug., 14:05, prabu  wrote:
>
>
>
> > hi,
> >  please somebody help me.I have a java project on app engine,how to
> > backup and restore database using pythan give example code

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[appengine-java] Re: Datastore Backup in JAVA

[Francois Masurel]

There is, at the moment, not native Java tools for doing backup/
restore.  You need to download the Python SDK.

You coul also star the following issue :
http://code.google.com/p/googleappengine/issues/detail?id=776

On Aug 30, 7:17 am, Star25  wrote:
> Can anyone tell me how to backup the Datastore in JAVA

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Re: [appengine-java] Oracle sues Google on Java Patents and Copyright

[Francois MASUREL]

Yep, but it's not the full standard OpenJDK as some classes are not
accessible (white list).

I bet Oracle doesn't agree with that.  But they'll probably do one thing at
a time, we'll see.

I don't enjoy what is going on at the moment, Java being my main developping
language for almost 10 years now.

François


On Sat, Aug 14, 2010 at 17:12, Wilson MacGyver  wrote:

> I don't think so. The lawsuit is really against the android VM Dalvik.
> Since GAE uses openjdk as far as I know, it's not a problem.
>
> On Aug 14, 2010, at 5:52 AM, François Masurel  wrote:
>
> > Will Google App Engine for Java be impacted ?
> >
> > I guess that if the Oracle patents are validated, Google wont be able
> > to use their "adapted" version of the JDK anymore because it will not
> > pass the TCK tests which is required to get the GPL patent grant.
> >
> > Does that mean the end of the Google App Engine for Java platform any
> > time soon ?
>
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