Hi Takashi, I will make this changes to my app (named tasks, set retry count to task queue)
I have a task (Task1) which adds another task (Task2) but I am doing this in a transaction, with a retry limit of 10. (It is not self creating task). Task1 execution code si surrounding by try catch so if it fails it is not recreated (it just logs the error). In this case it shouldn't create so many tasks... Thanks for the answer, with your advices your situation shouldn't happen. joi, 21 iunie 2012, 16:31:14 UTC+3, Takashi Matsuo (Google) a scris: > > Hi Alexandru, > > It's just a guess, but one possibility is that one of your task keeps > adding another task and then fails, and as a result, you have lots of > similar tasks in your queue. Here are few suggestions to prevent it > from happening. > > * Use named task for preventing task bomb > > https://developers.google.com/appengine/docs/java/taskqueue/overview#Task_Names > > If you try to add a task with the same name as one of the recent > tasks, it'll throw an error. You can just catch that error and ignore > it in most cases. > > * Set appropriate retry count for that queue > > https://developers.google.com/appengine/docs/java/config/queue#Configuring_Retry_Attempts_for_Failed_Tasks > > > Hope it helps! > > -- Takashi > > On Thu, Jun 21, 2012 at 5:33 AM, Alexandru Farcaş > <alex.far...@expert-group.biz> wrote: > > We had a short period (~40 minutes) when the number of instances > increased > > from 2-3 to ~30 which caused a very hugh increasion of frontend instance > > hour cost. There was also a problem with the datastore read operations > (10 > > times higher for this period) > > > > I think that this happened because a task was multiplied >2000 times. > This > > happened to me a long time ago (2, 3 times) when in a few seconds a > single > > task multiplied more than 2000 times and make the same operation (in my > case > > the read operation). I can't find anything from logs because the space > is > > full with com.google.apphosting.api.ApiProxy$OverQuotaException because > I > > had a budget limit on my app (which was reached). > > > > > > Another unusal thing is that my app has 8 idle instances (normally it > has > > 1-2) > > > > My app id: ebashr > > (HR, AppEngine Java 1.6.3 sdk) > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "Google App Engine" group. > > To view this discussion on the web visit > > https://groups.google.com/d/msg/google-appengine/-/rRDLKn95_tAJ. > > To post to this group, send email to google-appengine@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. > > > > -- > Takashi Matsuo | Developer Advocate | tmat...@google.com > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/t4I3UYvALT0J. To post to this group, send email to google-appengine@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.
