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

[Anders]

Hi Jose,

Ok, setting idle instances would be similar to Always On I assume. Plus I 
read in one of those threads that they are working on fixing some instance 
scheduler bug. So that should make the performance smoother. Unless they try 
to squeeze too many instances into too few physical servers. Because then 
even an idle instance can become very sluggish.

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

[Jose Montes de Oca]

Hi Anders,

Part of the new billing plan is to have Always on go away, they are going to 
be replace by Min Idle Instances. as of SDK 1.5.2 we made some changes to 
the Scheduler on how the reserved instances behave.

I would recommend you should take a look at this two threads on the groups 
where we discuss this in great detail:

https://groups.google.com/forum/#!topic/google-appengine/nRtzGtG9790
https://groups.google.com/forum/#!searchin/google-appengine/always$20on/google-appengine/uvQ5puBz9to/qBZZgBWtoHgJ

FYI, App Engine is not a trial product, we would leave preview by the end of 
the year.

Hope this helps!

Best,
Jose Montes de Oca

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[appengine-java] Re: using https with my domain

[Jose Montes de Oca]

Hi,

At the moment you can only use SSL on the appspot domain, more information 
on our FAQ:
http://code.google.com/appengine/kb/general.html#httpsapps

Hope this helps!

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

[Anders]

Now the performance is pretty good. And to not appear as a total jerk I want 
to add that overall GAE is really awesome. Now I can focus on the really 
challenging part which is to generate massive traffic. And then it will be 
interesting to see how GAE will manage that. :-)

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[appengine-java] Anyone using appscale over ec2?

[Gal Dolber]

Any comments or advices?

-- 
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http://code.google.com/p/guit/

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[appengine-java] Re: java.lang.LinkageError encountered loading Google Checkout classes

[Eddie C]

After some more digging, we've identified the offending code that's
causing our App to fail with 202 Errors.
We do not, however, fully know the cause.

We integrate with Google Checkout and use an older version (Google
Checkout Java Code for jdk1.5).
We create a
com.google.checkout.protocol.MerchantCalculationResultBuilder to
return tax information to Google Checkout as follows:

MerchantCalculationResultBuilder.getInstance();


This, in turn, calls
com.google.checkout.sample.protocol.AbstractProtocolBuilder's
constructor:

  protected AbstractProtocolBuilder() throws JAXBException,
ProtocolException {
_objectFact = new ObjectFactory();
_xmlMarshaller = createXmlMarshaller();
_xmlUnMarshaller = createXmlUnMashaller();
_domBuilder = createDomBuilder();
  }

The full source of this class can be found at:
http://code.google.com/p/google-checkout-java15-sample-code/source/browse/trunk/src/com/google/checkout/sample/protocol/AbstractProtocolBuilder.java

BOTH createXmlMarshaller() and createXmlUnMashaller() in the above
constructor create a JAXBContext as follows:

JAXBContext jc =
JAXBContext.newInstance("com.google.checkout.schema._2");


And therein lies the problem. The fact that JAXBContext.newInstance()
is called twice is, for some reason, causing App Engine to eventually
fail with an Error 202.
We haven't dug into the JAXB code - it's quite complex - so we're not
exactly sure why creating 2 JAXBContext instances is not allowed on
the App Engine cloud.

Anyway, our fix is to only create 1 JAXBContext; we've refactored the
constructor above so that we no longer create 2 contexts:

  protected AbstractProtocolBuilder() throws JAXBException,
ProtocolException {
// create only 1 JAXBContext and pass it into
createXmlMarshaller() and createXmlUnMashaller().
JAXBContext jc =
JAXBContext.newInstance("com.google.checkout.schema._2");

_objectFact = new ObjectFactory();
_xmlMarshaller = createXmlMarshaller(jc);
_xmlUnMarshaller = createXmlUnMashaller(jc);
_domBuilder = createDomBuilder();
  }



Does anybody have any insight into WHY the creation of 2 JAXBContexts
causes App Engine to fail with Error 202?
Also, any feedback on our proposed solution would be appreciated.

Thanks.



On Aug 25, 11:05 pm, Nichole  wrote:
> I started seeing errors due to changes in appengine security manager
> and a new appengine
> defined user-class loader on about July 21st for classes that I was
> constructing on
> the fly dynamically in the code using Constructor.  In addition to
> ExceptionInInitializerErrors there were logs statements about not
> being to resolve
> some of the members within the dynamically constructed class.  Some of
> those members
> were in other jars.  I added code to catch a few exceptions related to
> that and
> use the classes constructor instead.
>
> Your log statement java.lang.reflect.InvocationTargetException
> suggests that you may
> be seeing something similar.
>
> On Aug 24, 4:08 pm, Eddie C  wrote:
>
>
>
>
>
>
>
> > Hello.
>
> > Our app integrates with Google Checkout.
> > As part of the checkout process, Google Checkout makes an HTTP
> > callback request to our App to calculate taxes; it is at this point
> > that we are failing. It appears that the error occurs when our App
> > attempts to process XML content in the Google Checkout callback.
>
> > Here's the error that we see in the AppEngine console:
> > --
> > A serious problem was encountered with the process that handled this
> > request, causing it to exit. This is likely to cause a new process to
> > be used for the next request to your application.
> > If you see this message frequently, you should contact the App Engine
> > team. (Error code 202)
> > --
>
> > Not very helpful.
>
> > We turned up the logging level and got some more detailed logs.
> > Here's an excerpt from that log:
> > --
> > Caused by: java.lang.LinkageError: loader (instance of  com/google/
> > apphosting/runtime/security/UserClassLoader): attempted  duplicate
> > class definition for name: "com/google/checkout/schema/_2/
> > ShippingRestri

Re: [appengine-java] Re: Google plugin for Eclipse seems not to update 1.5.3 SDK version

[David Chandler]

see https://groups.google.com/d/msg/google-appengine-java/-/vyB42yXkoIwJ

On Fri, Aug 26, 2011 at 8:18 AM, cghersi  wrote:

> Hi Roberto,
>
> thanks for the response.
>
> I think I'll have to proceed in the manual way as you said; I hoped
> not to perform such action as the automatic way is far better!!
> Do you know how many days (more or less) they need to update the
> plugin to the latest version?
>
> Thanks
> bye
> cghersi
>
> On 26 Ago, 14:00, Roberto Saccon  wrote:
> > They don't seem to update the plugin whenever a new SDK comes out, but
> you
> > can download the SDK manually and point the eclipse plugin to the SDK.
>
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t: @googledevtools

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[appengine-java] BigTable "LIKE"

[realdope]

Hi,

I know that you cannot do a "LIKE" clause in BigTable. How do you get around 
this issue?

Suppose I'm making a book database, and I want to implement a search 
function that compares titles against a random string. What is a plausible 
mechanism with which to do so?

Any help would be appreciated!

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[appengine-java] Re: Appsstats for cronjob

[Sydney]

I had a Guice filter and I fixed it by putting the AppStats filter before 
the Guice filter

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Re: [appengine-java] using https with my domain

[Bruno Fuster]

It's in the roadmap.


On Fri, Aug 26, 2011 at 3:56 AM, Aswath Satrasala <
aswath.satras...@gmail.com> wrote:

> Hello,
> I want to use https with my domain www.AccountingGuru.in
> Any ideas on how to do this?
>
> Regards
> -Aswath
> www.AccountingGuru.in
>
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[appengine-java] Re: Always On not working properly

[Anders]

In this case it was the Java code. First it it took me several uploads to 
make the change happen. Now it's not even working with several uploads. I 
have used appcfg rollback recently and will try that again if I can get the 
upload to work. Frustrating!

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[appengine-java] Re: java.net.SocketTimeoutException: Timeout while fetching

[Ji]

i wonder you resolve the issue. I am having the similar problem. on my
app engine. one servlet gets data  and post data as multipart/form-
data to answer servlet. the form contain very small zip file that I am
generating in fly. whever, receiver servlet tried to read file
content, i am getting java.net.SocketTimeoutException: Timeout while
fetching. any idea how i cam resolve this issue?

Thanks

On Aug 19, 7:35 am, Luke  wrote:
> application B is real gwt application.  application A is use to crawl
> application B.  if the page content is minimum then no timeout. but
> when the content is lot then it timeout 99% of the time.   can google
> team set sockettimeout longer or dont set timeout for users that
> enabled billing?

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

[Simon Knott]

I should add that, as far as I'm aware, GAE is still in beta - it is due to 
come out of beta by the end of the year I believe.

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

[Simon Knott]

Are you talking about static resources, or your Java compiled code?  The 
former can be cached on the front-end servers, so you need to use some 
cache-busting techniques to get around that if you are updating static 
resources.  I can't say I've ever experienced issues with Java code being 
stale.

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

[Anders]

Another problem when switching to Always On is that sometimes when I upload 
new versions of the application no change happens! Even when I wait several 
minutes after the upload. Is Google App Engine really a finished product? Or 
is it still in a trial version? It's starting to feel really shaky.

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[appengine-java] Re: Google plugin for Eclipse seems not to update 1.5.3 SDK version

[cghersi]

Hi Roberto,

thanks for the response.

I think I'll have to proceed in the manual way as you said; I hoped
not to perform such action as the automatic way is far better!!
Do you know how many days (more or less) they need to update the
plugin to the latest version?

Thanks
bye
cghersi

On 26 Ago, 14:00, Roberto Saccon  wrote:
> They don't seem to update the plugin whenever a new SDK comes out, but you
> can download the SDK manually and point the eclipse plugin to the SDK.

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[appengine-java] Re: Google plugin for Eclipse seems not to update 1.5.3 SDK version

[Roberto Saccon]

They don't seem to update the plugin whenever a new SDK comes out, but you 
can download the SDK manually and point the eclipse plugin to the SDK.

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

[Anders]

I use the high replication datastore if that's what you mean by high 
availability.

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

[Mike Lawrence]

switching to the high availability data store
fixed this for me.

On Aug 25, 10:30 am, Anders  wrote:
> I switched on the Always On option and it works inasmuch as the dashboard
> shows three resident instances but new instances are started sometimes with
> only a few seconds between page accesses with very low overall traffic. In
> the log the message "This request caused a new process to be started for
> your application, and thus caused your application code to be loaded for the
> first time." pops every 10 log lines or so.
>
> Surely, with Always On activated, new instances should not be started
> several times every minute?! The reason I switched it on was to prevent
> exactly that from happening.

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[appengine-java] Re: Problem with Memcache

[Simon Knott]

Hi,

Additionally, it seems you can specify the error handling you would like in 
your application using the ErrorHandler 
interface
 
and the 
MemcacheService.setErrorHandlermethod.

Cheers,
Simon

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[appengine-java] Re: Problem with Memcache

[Simon Knott]

Hi,

According to the API docs, a* MemcacheServiceException * 
will
 
be thrown "for backend non-availability or similar error states which may 
occur, but are not necessarily indicative of a coding or usage error by the 
application".

I would go on the assumption that if an exception has occurred, that the 
operation you were attempting to do has not occurred.  i.e.  If you've 
attempted to clear the cache and get an exception, I'd assume that the cache 
still has data in it.

Cheers,
Simon

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[appengine-java] Re: Problem with Memcache

[cghersi]

Hi Simon, thank you for the fast response!

Surely my app is designed as you suggest: I try to get the object from
the cache, if not found I search it in the datastore.

Just a little confirm: what is the behavior of the methods
cache.containsKey(), cache.get() and cache.put() when the Memcache is
not available?
Do they throw an exception? what else? I cannot find such hints in the
documentation.
Moreover, when the method cache.clear() fails throwing the exception,
may I assume that the cache will be empty the next time I use it or
not?

Thank you very much!

Best
cghersi

On 26 Ago, 11:15, Simon Knott  wrote:
> Hi,
>
> There have been a number of issues with MemCache availability over the last
> few days.  You need to ensure that your code is written in such a way that
> if MemCache is unavailable, your application carries on as normal (if
> possible) - at the end of the day it's only a cache, not a datastore.
>
> Cheers,
> Simon

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[appengine-java] Re: Problem with Memcache

[Simon Knott]

Hi,

There have been a number of issues with MemCache availability over the last 
few days.  You need to ensure that your code is written in such a way that 
if MemCache is unavailable, your application carries on as normal (if 
possible) - at the end of the day it's only a cache, not a datastore.

Cheers,
Simon

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[appengine-java] Problem with Memcache

[cghersi]

Hi all,

I'm experiencing a problem with Memcache in the last days. I don't
touch that code from 6-7 months, ut in the last days I found in the
logs the following exception:
com.google.appengine.api.memcache.LogAndContinueErrorHandler
handleServiceError: Service error in memcache
com.google.appengine.api.memcache.MemcacheServiceException: Memcache
flush: exception
at
com.google.appengine.api.memcache.MemcacheServiceImpl.makeSyncCall(MemcacheServiceImpl.java:
205)
at
com.google.appengine.api.memcache.MemcacheServiceImpl.clearAll(MemcacheServiceImpl.java:
819)
at com.google.appengine.api.memcache.jsr107cache.GCache.clear(Unknown
Source)

thrown when I invoke this method:
private static net.sf.jsr107cache.Cache cache;
public static void initCache() {
  HashMap props = new HashMap();
  props.put(net.sf.jsr107cache.GCacheFactory.EXPIRATION_DELTA, 3600 *
24); //expiration=once a day

  try {
if (cache != null)
 cache.clear();
net.sf.jsr107cache.CacheFactory cacheFact =
net.sf.jsr107cache.CacheManager.getInstance().getCacheFactory();
cache = cacheFact.createCache(props);
   } catch (CacheException e) {
 log.severe("Cannot instantiate caches");
   }
}

and particularly at the line cache.clear().

What can I do?
Is there any property that I'm missing?

Thank you very much for the help!

Bye
cghersi

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[appengine-java] Google plugin for Eclipse seems not to update 1.5.3 SDK version

[cghersi]

Hi all,

I tried to update my Google plugin for Eclipse (Helios) to the new SDK
version (1.5.3), but the system tries to update plugin to 1.5.2 SDK
version.
I tried both from Remote site and from local archive.
Anyone has the same problem?

How may I solve my issue?

Thank you very much
Bye
cghersi

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

[Anders]

And why so complicated price model? Isn't it possible to normalize 
difference things like CPU, number of instances, data storage and bandwidth 
cost etc into a single metric? And then have enough physical servers etc so 
that too much instance swapping is prevented. With a normalization like that 
it would be as simple as paying for electricity. The amount of resources an 
application needs, regardless of whether it's more CPU or data storage or 
bandwidth or primary memory or whatever, since the resources are normalized 
they can all be combined into a single parameter, would be like paying for 
the amount of electricity used.

Too much optimization by having all kinds of parameters for customers to 
choose between and alter will likely be a suboptimization overall. Some 
customers may need to fine-tune things on a detailed level, so manual 
options could be available but also an automatic default price model that 
would be as simple as paying for electricity.

I don't want to regulate the budget manually except for setting a monthly 
amount. And instead have an algorithm automatically distributing the budget 
amount for the different kinds of resources. And have statistics presented 
showing how much the application consumes for each resource type such as 
CPU, data storage etc, so that I can optimize the application without having 
to manually adjust the budget distribution.

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