Now I get this 500 error quite frequently. See the log below in Admin
Console. I believe this is different from HardDeadlineExceededError
problem (exceeded 30 seconds limit) as there wasn't any
HardDeadlineExceededError exception logged in log. The site was
accessed by one user, hence the simultaneous dynamic request limit (30
requests) shouldn't have exceeded. Any idea?
"#
1.
03-04 07:38AM 42.337 /person/location 500 10680ms 0cpu_ms 0kb
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.8) Gecko/
20100202 Firefox/3.5.8,gzip(gfe),gzip(gfe)
See details
203.115.242.154 - - [04/Mar/2010:07:38:53 -0800] "GET /person/
location HTTP/1.1" 500 0 "http://m.mobisociety.com/person/location";
"Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.8) Gecko/
20100202 Firefox/3.5.8,gzip(gfe),gzip(gfe)" "m.mobisociety.com"
2.
W 03-04 07:38AM 53.018
Request was aborted after waiting too long to attempt to service
your request. Most likely, this indicates that you have reached your
simultaneous dynamic request limit. This is almost always due to
excessively high latency in your app. Please see
http://code.google.com/appengine/docs/quotas.html for more details."
On Mar 4, 11:56 am, yjun hu <[email protected]> wrote:
> Sorry, i'm using spring+struts , action class means controller in spring
> mvc.
> run cron job to make reactive, it's a temporary way, just make this problem
> always be happen
>
>
>
> On Thu, Mar 4, 2010 at 11:51 AM, Wong <[email protected]> wrote:
> > I am not sure what do you mean by action class. Could you please give
> > me a pointer?
>
> > I made change to ping a Controller class every 1 min. Same problem
> > persists.
>
> > On Mar 4, 11:06 am, yjun hu <[email protected]> wrote:
> > > maybe you'd better run hitting an action class, not a simple jsp page.
>
> > > On Thu, Mar 4, 2010 at 11:01 AM, Wong <[email protected]> wrote:
>
> > > > I used to run cron to make request every 1 min to a jsp which only
> > > > write out a line of text. I uses a HttpSessionListener to listen for
> > > > any "loading request"/startup. Even ping every 1 min the loading
> > > > request still happens. I still got 500 error due to the request CPU is
> > > > is over the limit.
>
> > > > On Mar 4, 10:21 am, yjun hu <[email protected]> wrote:
> > > > > Can anyone confirm that Spring MVC version 2.5.6 is working fine on
> > > > > GAE?
>
> > > > > No, the same problem is also in spring2.5
>
> > > > > there is no better way to avoid that, you can try to run cron job to
> > make
> > > > > your application reactive .
>
> > > > > Hitting a url every 1 miute, i did this ,that's all i did.
>
> > > > > On Thu, Mar 4, 2010 at 10:16 AM, Wong <[email protected]> wrote:
>
> > > > > > This problem normally happens "In the case of loading requests,
> > > > > > though, the execution time is artificially longer due to the extra
> > > > > > application initialization required.".
>
> >http://code.google.com/appengine/kb/java.html#Do_I_Need_To_Be_Concern.
> > > > ..
>
> > > > > > I am using Spring MVC version 3.0.0 RC1. I can't really do much to
> > > > > > reduce the "loading request" or application/framework
> > initialization
> > > > > > time. And, since this is a hard limit, I think I can't do anything
> > > > > > other than switching to other framework or plain servlet. However,
> > I
> > > > > > also see a lot of posts by other on "loading request" issue even in
> > > > > > plain servlet.
>
> >http://groups.google.com/group/google-appengine-java/browse_thread/th.
> > > > ..
>
> > > > > > Can anyone confirm that Spring MVC version 2.5.6 is working fine on
> > > > > > GAE?
>
> > > > > > On Mar 4, 9:51 am, gholler <[email protected]> wrote:
> > > > > > > No, the 30 second limit is a hard limit. If a request can't
> > finish in
> > > > > > > 30 seconds (or somewhat earlier), you get an exception. You then
> > have
> > > > > > > an undetermined amount of time before the app engine kills your
> > > > > > > request and returns a 500 status code. You wouldn't happen to be
> > > > using
> > > > > > > Spring, would you?
>
> > > > > > > On Mar 3, 7:57 pm, Wong <[email protected]> wrote:
>
> > > > > > > > Hi,
>
> > > > > > > > I am using Spring MVC. The application being cycled out overly
> > > > > > > > aggressively (sometimes less than 1 min)
>
> > > >http://groups.google.com/group/google-appengine-java/browse_thread/th.
> > > > > > ..
>
> > > > > > > > I register an HttpSessionListener to listen for "loading
> > request"
> > > > > > > > which takes more than 20 seconds.
>
> > > > > > > > Due to the long loading request/cold start time, some requests
> > hit
> > > > the
> > > > > > > > following HardDeadlineExceededError exception.
>
> > > > > > > > Log seen in my Admin Console:
> > > > > > > > com.google.apphosting.runtime.HardDeadlineExceededError: This
> > > > request
> > > > > > > > (eb11499c97029f78) started at 2010/03/03 16:41:08.062 UTC and
> > was
> > > > > > > > still executing at 2010/03/03 16:41:37.260 UTC.
>
> > > > > > > > This request used a high amount of CPU, and was roughly 1.5
> > times
> > > > over
> > > > > > > > the average request CPU limit. High CPU requests have a small
> > > > quota,
> > > > > > > > and if you exceed this quota, your app will be temporarily
> > > > disabled.
>
> > > > > > > > I am currently on free quota. If I enable billing and set to
> > higher
> > > > > > > > CPU quota, will I be able to avoid the
> > HardDeadlineExceededError
> > > > > > > > problem?
>
> > > > > > --
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