问题描述
我们经常面临以下问题：AppFabric缓存服务崩溃并出现以下错误消息，
AppFabric缓存服务因异常{System.Runtime.CallbackException：Async Callback引发异常而崩溃。 ---> System.NullReferenceException：对象引用未设置为对象的实例。
在Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.GetPlaceHolderObject（对象键）
在Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PreProcess（MDHObjectNode oldObjectNode，MDHObjectNode& newObjectNode，MDHOperationInfo& operationInfo）
在Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PutNodeInSlot（MDHOperationInfo& operationInfo，MDHDirectoryNode dir，Int32 slotIndex）
在Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.TryOperation（MDHOperationInfo& operationInfo）
在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，TimeSpan lockTimeOut，Boolean lockKey，Object opState）
在Microsoft.ApplicationServer.Caching.OMRegion.GetAndLock（对象键，TimeSpan lockTimeOut，Boolean lockKey，Object opState）
在Microsoft.ApplicationServer.Caching.ObjectManager.GetAndLock（String cacheName，String regionName，Object key，TimeSpan lockTimeOut，DataCacheLockHandle& lHandle，Boolean lockKey，Object opState）
在Microsoft.ApplicationServer.Caching.VelocityDataStore.ProcessWriteRequest（RequestBody request）
在Microsoft.ApplicationServer.Caching.VelocityDataStore.ProcessMessageRequest（RequestBody request）
在Microsoft.ApplicationServer.Caching.DistributedObjectManager.OnReceiveMessageFromRemoteDRM（IReplyContext replyContext）
在Microsoft.ApplicationServer.Caching.WcfServerChannel.InvokeCallback（消息消息，IChannelContainer容器）
在Microsoft.ApplicationServer.Caching.WcfServerChannel.CompleteProcessing（IAsyncResult结果）
at System.Runtime.AsyncResult.Complete（Boolean completedSynchronously）
---内部异常堆栈跟踪结束---
at System.Runtime.AsyncResult.Complete（Boolean completedSynchronously）
at System.ServiceModel.Channels.SynchronizedMessageSource.ReceiveAsyncResult.OnReceiveComplete（Object state）
在System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete（对象状态）
在System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame（IAsyncResult结果）
在System.Net.LazyAsyncResult.Complete（IntPtr userToken）
在System.Net.Security.NegotiateStream.ProcessFrameBody（Int32 readBytes，Byte [] buffer，Int32 offset，Int32 count，AsyncProtocolRequest asyncRequest）
在System.Net.Security.NegotiateStream.ReadCallback（AsyncProtocolRequest asyncRequest）
在System.Net.FixedSizeReader.CheckCompletionBeforeNextRead（Int32 bytes）
在System.Net.FixedSizeReader.ReadCallback（IAsyncResult transportResult）
at System.Runtime.AsyncResult.Complete（Boolean completedSynchronously）
at System.ServiceModel.Channels.ConnectionStream.ReadAsyncResult.OnAsyncReadComplete（Object state）
at System.ServiceModel.Channels.SocketConnection.AsyncReadCallback（Boolean hasResult，Int32 error，Int32 bytesRead）
在System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame（UInt32错误，UInt32 bytesRead，NativeOverlapped * nativeOverlapped）
在System.Threading._IOCompletionCallback.PerformIOCompletionCallback（UInt32 errorCode，UInt32 numBytes，NativeOverlapped * pOVERLAP）}。检查调试日志以获取更多信息
然后非常接下来的访问总是记录以下错误信息，
AppFabric缓存服务崩溃。{Lease外部存储过期：}
缓存集群配置和数据库服务器时序相同。我们在群集中只有一个主机。
急切等待回复，因为这是生产问题。
问候，
Hariharan
Hi,
We are facing the following issue very frequently that AppFabric Caching service is crashing with following error message,
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, TimeSpan lockTimeOut, Boolean lockKey, Object opState)
at Microsoft.ApplicationServer.Caching.OMRegion.GetAndLock(Object key, TimeSpan lockTimeOut, Boolean lockKey, Object opState)
at Microsoft.ApplicationServer.Caching.ObjectManager.GetAndLock(String cacheName, String regionName, Object key, TimeSpan lockTimeOut, DataCacheLockHandle& lHandle, Boolean lockKey, 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.WcfServerChannel.InvokeCallback(Message message, IChannelContainer container)
at Microsoft.ApplicationServer.Caching.WcfServerChannel.CompleteProcessing(IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
--- End of inner exception stack trace ---
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.ServiceModel.Channels.SynchronizedMessageSource.ReceiveAsyncResult.OnReceiveComplete(Object state)
at System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete(Object state)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.Net.LazyAsyncResult.Complete(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.FixedSizeReader.CheckCompletionBeforeNextRead(Int32 bytes)
at System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.ServiceModel.Channels.ConnectionStream.ReadAsyncResult.OnAsyncReadComplete(Object state)
at System.ServiceModel.Channels.SocketConnection.AsyncReadCallback(Boolean haveResult, Int32 error, Int32 bytesRead)
at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)}. Check debug log for more information
and then very next access always logs the following error msg,
AppFabric Caching service crashed.{Lease with external store expired: }
The Cache cluster configuration and database server timing are same. We have only one host in the cluster.
Eagerly awaiting the reply as it is a production issue.
Regards,
Hariharan
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