区域清除后，具有适当速度的NHibernate崩溃

问题描述

| 我正在将NHibernate和VeLocity用作第二级缓存级别提供程序。 我需要清除一个区域。我正在使用以下代码：

_sessionFactory.evictQueries(\"Authorization\");
var authCache = _sessionFactory.GetSecondLevelCacheRegion(\"Authorization\");
authCache.Clear();

authCache.Clear（）实际上正在调用NHibernate.Caches.VeLocity.VeLocityClient.Cache方法。 该区域已正确清除。但是在那之后，将打开一个新会话，并对先前缓存的实体进行查询。它尝试在VeLocityClient中获取GetAndLock。砰。 AppFabricCachingService崩溃（请参阅下面的事件日志） 我是否正确清除了缓存？我怎么了 ===================== 事件记录日志

AppFabric Caching service crashed with exception {System.Runtime.CallbackException: Async Callback threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.GetPlaceHolderObject(Object key)
   at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PreProcess(MDHObjectNode oldobjectNode,MDHObjectNode& newObjectNode,MDHOperationInfo& operationInfo)
   at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PutNodeInSlot(MDHOperationInfo& operationInfo,MDHDirectoryNode dir,Int32 slotIndex)
   at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.TryOperation(MDHOperationInfo& operationInfo)
   at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PerformOperation(MDHOperationInfo& operationInfo)
   at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.GetAndLock(Object key,TimeSpan lockTimeOut,Boolean lockKey,DMOperationCallBack preOperation,DMOperationCallBack postOperation,Object opState)
   at Microsoft.ApplicationServer.Caching.DMHashContainer.GetAndLock(Object key,Object opState)
   at Microsoft.ApplicationServer.Caching.ObjectManager.GetAndLock(String cacheName,String regionName,Object key,DataCacheLockHandle& lHandle,Object opState)
   at Microsoft.ApplicationServer.Caching.VeLocityDataStore.ProcessWriteRequest(RequestBody request)
   at Microsoft.ApplicationServer.Caching.VeLocityDataStore.ProcessMessageRequest(RequestBody request)
   at Microsoft.ApplicationServer.Caching.distributedobjectManager.OnReceiveMessageFromremoteDRM(IReplyContext replyContext)
   at Microsoft.ApplicationServer.Caching.WcfTransportChannel.InvokeCallback(Message message,IChannelContainer container)
   at Microsoft.ApplicationServer.Caching.WcfServerChannel.InvokeCallback(Message message,IChannelContainer container)
   at Microsoft.ApplicationServer.Caching.WcfServerChannel.CompleteProcessing(IAsyncResult result)
   at Microsoft.ApplicationServer.Caching.WcfTransportChannel.Receive(IAsyncResult result)
   at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
   --- End of inner exception stack trace ---
   at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
   at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously,Exception exception)
   at System.ServiceModel.Channels.SynchronizedMessageSource.ReceiveAsyncResult.OnReceiveComplete(Object state)
   at System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete(Object state)
   at System.ServiceModel.Channels.StreamConnection.OnRead(IAsyncResult result)
   at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
   at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
   at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result,IntPtr userToken)
   at System.Net.Security.NegotiateStream.ProcessFrameBody(Int32 readBytes,Byte[] buffer,Int32 offset,Int32 count,AsyncProtocolRequest asyncRequest)
   at System.Net.Security.NegotiateStream.ReadCallback(AsyncProtocolRequest asyncRequest)
   at System.Net.AsyncProtocolRequest.CompleteRequest(Int32 result)
   at System.Net.FixedSizeReader.CheckCompletionBeforeNextRead(Int32 bytes)
   at System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
   at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
   at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously,Exception exception)
   at System.ServiceModel.Channels.ConnectionStream.ReadAsyncResult.OnAsyncReadComplete(Object state)
   at System.ServiceModel.Channels.socketConnection.FinishRead()
   at System.ServiceModel.Channels.socketConnection.AsyncReadCallback(Boolean haveResult,Int32 error,Int32 bytesRead)
   at System.ServiceModel.Channels.OverlappedContext.CompleteCallback(UInt32 error,UInt32 numBytes,NativeOverlapped* nativeOverlapped)
   at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error,UInt32 bytesRead,NativeOverlapped* nativeOverlapped)
   at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode,NativeOverlapped* pOVERLAP)}. Check debug log for more @R_828_4045@ion

    

解决方法

这是一个已知的AF缓存错误。缓存项锁定时，“区域清除”会导致崩溃。看到这个线程： 清除系统区域时发生异常 解决方法是：不是清除而是应该在随附的AF Cache PS控制台中重新启动群集。