Google app engine 此异常是否意味着appstats正在锁定我的appengine应用程序？

我的应用程序已经运行了一个月，只是偶尔超过了最后期限。今天早上，在五分钟的时间里，我收到了150封超过截止日期的邮件。现在又恢复正常了。我知道这可能会发生，并且不一定会通过我在代码中所做的任何事情来解决，但每个异常都在堆栈跟踪中有appstats（至少是我最仔细查看的20个）。一方面，这涉及到appstats——另一方面，我猜appstats可能存在于曾经运行过的每个堆栈跟踪中。我试图确定appstats是否是问题所在

我不是过滤器方面的专家——有谁能告诉我，下面这样的堆栈跟踪是否意味着代码在appstats中等待了很长时间？看起来这确实意味着，但我想也许过滤器是以一种混淆堆栈跟踪的方式链接在一起的。此外，即使它正在appstats中等待—问题似乎可能是数据存储不可用（在全局appengine状态页面上没有明显的问题）

我把星号放在明显的appstats调用的开头，以便快速扫描

javax.servlet.ServletContext log: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract com.activegrade.shared.dto.ResultDTO com.activegrade.client.serviceinterfaces.CourseOperationService.getCourseList(com.activegrade.shared.dto.AuthInfo)' threw an unexpected exception: com.google.apphosting.api.DeadlineExceededException: This request (1ff876185c635baf) started at 2010/11/30 14:35:47.278 UTC and was still executing at 2010/11/30 14:36:16.261 UTC.
    at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:378)
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:581)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:207)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:243)
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
  **at com.google.appengine.tools.appstats.AppstatsFilter.doFilter(AppstatsFilter.java:140)**
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$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.handleRequest(JavaRuntime.java:261)
    at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:8486)
    at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:8484)
    at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24)
    at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:418)
    at com.google.net.rpc.impl.Server$RpcTask.runInContext(Server.java:572)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:448)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:688)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:326)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:318)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:446)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:636)
Caused by: com.google.apphosting.api.DeadlineExceededException: This request (1ff876185c635baf) started at 2010/11/30 14:35:47.278 UTC and was still executing at 2010/11/30 14:36:16.261 UTC.
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:502)
  **at com.google.appengine.tools.appstats.RecordingFuture.get(RecordingFuture.java:99)
  **at com.google.appengine.tools.appstats.RecordingFuture$ExtendedFuture.get(RecordingFuture.java:44)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:42)
    at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:42)
    at com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:71)
    at com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:32)
    at com.google.appengine.api.datastore.QueryResultsSourceImpl.loadMoreEntities(QueryResultsSourceImpl.java:69)
    at com.google.appengine.api.datastore.QueryResultsSourceImpl.loadMoreEntities(QueryResultsSourceImpl.java:56)
    at com.google.appengine.api.datastore.QueryResultIteratorImpl.ensureLoaded(QueryResultIteratorImpl.java:156)
    at com.google.appengine.api.datastore.QueryResultIteratorImpl.hasNext(QueryResultIteratorImpl.java:65)
    at org.datanucleus.store.appengine.DatastoreElementContainerStoreSpecialization.getChildren(DatastoreElementContainerStoreSpecialization.java:105)
    at org.datanucleus.store.appengine.DatastoreFKListStore.listIterator(DatastoreFKListStore.java:48)
    at org.datanucleus.store.mapped.scostore.AbstractListStore.listIterator(AbstractListStore.java:84)
    at org.datanucleus.store.mapped.scostore.AbstractListStore.iterator(AbstractListStore.java:74)
    at org.datanucleus.sco.backed.List.loadFromStore(List.java:241)
    at org.datanucleus.sco.backed.List.initialise(List.java:190)
    at org.datanucleus.sco.SCOUtils.newSCOInstance(SCOUtils.java:183)
    at org.datanucleus.store.mapped.mapping.AbstractContainerMapping.replaceFieldWithWrapper(AbstractContainerMapping.java:426)
    at org.datanucleus.store.mapped.mapping.AbstractContainerMapping.postFetch(AbstractContainerMapping.java:444)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.runPostFetchMappingCallbacks(DatastorePersistenceHandler.java:510)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:489)
    at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:565)
    at org.datanucleus.store.appengine.DatastoreRelationFieldManager.lookupOneToOneChild(DatastoreRelationFieldManager.java:320)
    at org.datanucleus.store.appengine.DatastoreRelationFieldManager.fetchRelationField(DatastoreRelationFieldManager.java:274)
    at org.datanucleus.store.appengine.DatastoreFieldManager.fetchObjectField(DatastoreFieldManager.java:289)
    at org.datanucleus.state.AbstractStateManager.replacingObjectField(AbstractStateManager.java:1197)
    at com.activegrade.server.dao.Course.jdoReplaceField(Course.java)
    at com.activegrade.server.dao.Course.jdoReplaceFields(Course.java)
    at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2772)
    at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2791)
    at org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:480)
    at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:565)
    at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:520)
    at org.datanucleus.store.appengine.query.DatastoreQuery.access$300(DatastoreQuery.java:110)
    at org.datanucleus.store.appengine.query.DatastoreQuery$6.apply(DatastoreQuery.java:638)
    at org.datanucleus.store.appengine.query.DatastoreQuery$6.apply(DatastoreQuery.java:630)
    at org.datanucleus.store.appengine.query.LazyResult.resolveNext(LazyResul

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Appstats将插装插入到应用程序引擎堆栈中，以便为应用程序进行的所有RPC调用计时。由于死线超出错误是由RPC抛出的，因此Appstats将始终位于堆栈中。这个有问题的电话不是由appstats发出的——它只是记录下来的