Thanks Jason for help. In our case the problem was caused by usage of
byte[] field in a persisted class. Somehow though, it wasn't causing
any problems immediately, but only after a few objects have been
saved. Per Jason, usage of byte[] in JDO on GAE isn't supported.

On Wed, Nov 18, 2009 at 1:00 PM, Diana Cruise <[email protected]> wrote:
> What's the latest here Dmitry...can GAE handle more than 100 request
> or not?  Please update where you are with this problem.  Thanks.
>
> On Nov 9, 5:15 pm, Dmitry Anipko <[email protected]> wrote:
>> Following up offline and will update with resolution later.
>>
>>
>>
>> On Mon, Nov 9, 2009 at 9:50 AM, Jason (Google) <[email protected]> wrote:
>> > As always, I need your application ID in order to help troubleshoot
>> > app-specific issues. Please provide that and any stack traces or other 
>> > error
>> > messages you see in your application's logs.
>>
>> > - Jason
>>
>> > On Fri, Nov 6, 2009 at 9:47 PM, Dmitry Anipko <[email protected]>
>> > wrote:
>>
>> >> After some more experimentation, it looks like there is something in
>> >> the data store that is surfaced by our application:
>>
>> >> if I clean up the store for the application completely, using the web
>> >> interface, then for the first ~100 request it works fine, but after
>> >> some time, it starts producing those errors I wrote before - it can't
>> >> query objects by index (and that problem persists until I clean the
>> >> store again).
>>
>> >> The second observation - although I don't know if it is related or not
>> >> - is when the store for my app is in such state, and I try to view
>> >> objects through the web interface, the web interfaces crashes with the
>> >> error 500:
>>
>> >> Server Error
>> >> A server error has occurred.
>>
>> >> Return to Applications screen »
>>
>> >> GAE folks, can someone please take a look - this is a blocking issue
>> >> for my team, and I don't know how to proceed here without your help.
>>
>> >> Everything works just fine when I run it on a local development
>> >> server.
>>
>> >> Thank you.
>>
>> >> On Nov 6, 11:05 am, Diana Cruise <[email protected]> wrote:
>> >> > I see NO reply from GAE here regarding such a critical issue!!!
>>
>> >> > Is your app still down, what is the status of your app?  How are we
>> >> > supposed to put an application in production with GAE if such a
>> >> > problem can occur with NO response for 3 days?  Is there another
>> >> > channel to raise such high-priority issues to get proper helpdesk
>> >> > response?
>>
>> >> > On Nov 4, 1:58 am, Dmitry Anipko <[email protected]> wrote:
>>
>> >> > > It is 11:56 Pacific 11/3/2009, are there any known issues withGAE
>> >> > > right now?
>>
>> >> > > My application that has been working for a couple of months now today
>> >> > > started producing failures for some queries from the data store
>> >> > > (basically an object which has just been stored cannot be retrieved
>> >> > > after that by key), and after some time started producing even
>>
>> >> > > <html><head>
>> >> > > <meta http-equiv="content-type" content="text/html;charset=utf-8">
>> >> > > <title>500 Server Error</title>
>> >> > > </head>
>> >> > > <body text=#000000 bgcolor=#ffffff>
>> >> > > <h1>Error: Server Error</h1>
>> >> > > <h2>The server encountered an error and could not complete your
>> >> > > request.<p>If the problem persists, please <A HREF="http://
>> >> > > code.google.com/appengine/support/">report</A> your problem and
>> >> > > mention this error message and the query that caused it.</h2>
>> >> > > <h2></h2>
>> >> > > </body></html>
>>
>> >> > > The same application executes just fine in the localGAEdevelopment
>> >> > > environment. Can folks fromGAEcomment if there is any maintenance
>> >> > > going on right now or how could I get more details on what causing the
>> >> > > failures (again the same code worked for quite some time now, so I
>> >> > > think it is unlikely the code is the issue here). Thanks for your
>> >> > > help.- Hide quoted text -
>>
>> >> > - Show quoted text -- Hide quoted text -
>>
>> - Show quoted text -
>
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