I forgot to add that as you can see on the graph that is attached to the previous email, our request/sec rate which has been at about 5 queries/sec for the past few weeks is now showing spikes at 10 queries per sec, followed by drops to 0 queries per sec. There is no logical way to explain this, we should still have a pretty much constant 5 reqs/sec rate.
The error rate spikes do not correlate to the reqs/sec unexpected spikes though. Let me know if I can provide additional data for review. Thanks Jerome On Jan 8, 6:54 pm, Jerome Mouton <jerome.mou...@gmail.com> wrote: > Hello, > > Our AppEngine application has been experiencing an increase rate of > bogus exceptions for the past 48+ hours. See the attached image for > our requests/seconds and errors/seconds for the last 6 hours. We have > been seeing the exact same pattern for the past 2 days. > > This is an app with billing enabled, and we have way (over 10x) below > our billing quotas. > The only change we can figure out that started at about the same time > as this increase rate of error was the usage of the XMPP API being > more frequent than before, but the exceptions are not related to the > XMPP API calls, they are the one of the following: > > - com.google.appengine.api.datastore.DatastoreTimeoutException: Unknown > on servlets data store JDO queries that are expected to be (and most > of the time are) extremely fast; when it fails, the servlet shows > times in this area: 4135ms 187cpu_ms 12api_cpu_ms > > - com.google.apphosting.api.ApiProxy$ApiDeadlineExceededException: The > API call datastore_v3.RunQuery() took too long to respond and was > cancelled. > on servlets data store JDO queries that are expected to be (and most > of the time are) extremely fast; when it fails, the servlet shows > times in this area: 5464ms 194cpu_ms > > - 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 > seehttp://code.google.com/appengine/docs/quotas.htmlfor more details. > > Is this reliability degradation for the past 48 hours seen by other > users? If a Googler needs our appId for review, please drop me an > email. > > Thank you. > > Jerome > > 20100108-appengine_issue.png > 80KViewDownload
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