workflow-foundation-4 - WWF ワークフロー永続ストアの例外

Question

「WWF」をワークフロー エンジンとして使用しているシステムがあり、ワークフローを続行するリクエストが頻繁に失敗し、ログがこの例外でいっぱいになります。

System.Runtime.DurableInstancing.InstancePersistenceException : SqlWorkflowInstanceStore ロックがデータベースに存在しません。これは、SQL Server がビジーであるか、接続が一時的に失われたために発生した可能性があります。

そしてそれはこれで発火しますevent (application.Aborted = (e) =>{})、この問題を解決する方法についてのアイデアはありますか?

ワークフローをロードしてロックを解除する方法は次のとおりです

            //Create an instance of the workflow and its application and associate with workflow application.
            Activity workflow = Activator.CreateInstance(workflowType) as Activity;
            WorkflowApplication application = new WorkflowApplication(workflow);
            application.SynchronizationContext = SyncSynchronizationContext.SingletonInstance;

            //Hold the workflow store            
            application.InstanceStore = CreateInstanceStore(WorkflowDatabaseConnectionString);
            var instanceHandle = application.InstanceStore.CreateInstanceHandle(guid);
            var ownerCommand = new CreateWorkflowOwnerCommand();
            var view = application.InstanceStore.Execute(instanceHandle, ownerCommand, TimeSpan.FromDays(30));

            application.InstanceStore.DefaultInstanceOwner = view.InstanceOwner;
            // Do whatever needs to be dome with multiple WorkflowApplications

            if (pParticipant != null)
                application.Extensions.Add(pParticipant);

            //Register workflow application services from the external world
            ExternalRegisteredServices.ForEach(service => application.Extensions.Add(service));

            ReadOnlyCollection<BookmarkInfo> currentBookmarks = null;
            Dictionary<string, object> wfContextBag = null;

            application.PersistableIdle = (workflowApplicationIdleEventArgs) =>
            {
                currentBookmarks = workflowApplicationIdleEventArgs.Bookmarks;

                wfContextBag = workflowApplicationIdleEventArgs
                    .GetInstanceExtensions<WorkflowContext>()
                    .First()
                    .GetBag();
                return PersistableIdleAction.Unload;
            };

            application.OnUnhandledException = (e) =>
            {
                if (wfUnhandledExceptionEventHandler != null)
                    wfUnhandledExceptionEventHandler(e);
                return UnhandledExceptionAction.Abort;
            };

            application.Aborted = (e) =>
            {
                if (wfAbortedEventHandler != null)
                    wfAbortedEventHandler(e);
            };

            application.Completed = (e) =>
            {
                if (wfCompletedEventHandler != null)
                    wfCompletedEventHandler(e);
            };

            application.Load(guid);

            BookmarkResumptionResult resumptionResult = BookmarkResumptionResult.NotFound;
            if (!string.IsNullOrEmpty(bookmarkName))
                resumptionResult = application.ResumeBookmark(bookmarkName, null);

            if (resumptionResult != BookmarkResumptionResult.Success)
                currentBookmarks = application.GetBookmarks();

            var deleteOwnerCommand = new DeleteWorkflowOwnerCommand();
            application.InstanceStore.Execute(instanceHandle, deleteOwnerCommand, TimeSpan.FromSeconds(30));
            instanceHandle.Free();