Thanks for the tip on the Blobstore issue with the migration. Nothing much has changed on our side, but we've started seeing more of these data store put exceptions - its frequency has slowly but surely increased (may of the requests that face this problem also have low latencies - <1 sec.). So, we are considering HR datastore migration. Thanks for alerting us to the Blobstore situation you have.
Regards, Arun On Jun 5, 10:57 pm, c h <how...@umich.edu> wrote: > i was seeing a crap-ton of deadline exceeded exceptions on starmakerapp > from about 9:30-10:00am PDT today. the exceptions were on datastore put > calls, and caused instance thrashing (my average instance life was under 1 > minute) and made my app unresponsive returning 500 errors to my users. > > yup, i'm on master slave datastore. i'm still waiting for a response > tohttp://code.google.com/p/googleappengine/issues/detail?id=7434before i > migrate. > > > > > > > > On Tuesday, June 5, 2012 10:03:15 AM UTC-7, aramanuj wrote: > > > 1. > > > Hi, > > > We are seeing several > > "com.google.apphosting.api.ApiProxy$CancelledException: The API call > > datastore_v3.Put() was explicitly cancelled." exceptions on any page trying > > to access the datastore (at around 10:00am PDT). This is the first time > > we've observed this on our application (samaanguru). It is using the > > master-slave datastore. Clearly, the datastore writes are not happening. > > Can anyone throw light on what's happening? > > > The stack-trace is as below. > > > Thanks, > > Arun > > > com.google.apphosting.api.ApiProxy$CancelledException: The API call > > datastore_v3.Put() was explicitly cancelled. > > at > > com.google.apphosting.runtime.ApiProxyImpl$5.get(ApiProxyImpl.java:361) > > at > > com.google.apphosting.runtime.ApiProxyImpl$5.get(ApiProxyImpl.java:359) > > at > > com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90) > > at > > com.google.appengine.api.datastore.FutureHelper$CumulativeAggregateFuture.get(FutureHelper.java:145) > > at > > com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:90) > > at > > com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:72) > > at > > com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:33) > > at > > com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(DatastoreServiceImpl.java:113) > > at > > com.google.appengine.api.datastore.DatastoreServiceImpl$2.runInternal(DatastoreServiceImpl.java:110) > > at > > com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:31) > > at > > com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:110) > > at > > com.google.appengine.api.datastore.DatastoreServiceImpl.put(DatastoreServiceImpl.java:94) > > at > > com.google.apphosting.runtime.jetty.DatastoreSessionStore.saveSession(DatastoreSessionStore.java:93) > > at > > com.google.apphosting.runtime.jetty.SessionManager$AppEngineSession.save(SessionManager.java:164) > > at > > com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:41) > > at > > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) > > at > > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43) > > at > > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157) > > at > > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388) > > at > > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) > > at > > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182) > > at > > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765) > > at > > org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418) > > at > > com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:249) > > at > > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) > > at org.mortbay.jetty.Server.handle(Server.java:326) > > at > > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) > > at > > org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923) > > at > > com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) > > at > > org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) > > at > > com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:135) > > at > > com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:477) > > at > > com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:449) > > at > > com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:455) > > at > > com.google.tracing.TraceContext.runInContext(TraceContext.java:695) > > at > > com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:333) > > at > > com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:325) > > at > > com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:453) > > at > > com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251) > > at java.lang.Thread.run(Thread.java:679) > > > 2. 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