Debugging SharePoint Workflows

May 5, 2009

This blog post is about tips and tricks for monitoring the health of SharePoint workflows. I will like to suggest  this excellent MSDN article for additional information.

Logging information about the progress of workflows

The WF tracking service logs the events as the workflow progresses along.  For example, consider a simple workflow (see below) that creates a task and then loops until the task is 100% complete.

 

 

clip_image002

 

 

By turning the tracking service on (see [1]) we can capture entries like the following, the trace output below corresponds to the workflow in Figure 1 above:

 

System.Workflow.Runtime.Hosting Information: 0 : Creating instance 1888f8e6-145c-4220-be52-99cfd09098a7

 

System.Workflow.Runtime Information: 1 : Workflow Runtime: Scheduler: InstanceId: 1888f8e6-145c-4220-be52-99cfd09098a7 : Running scheduled entry: SubscriptionEvent((1)Workflow1, ActivityStatusChange(‘(1)createTask1‘, Closed, Succeeded))

 

System.Workflow.Runtime Information: 0 : Activity Status Change – Activity: whileActivity1 Old:Initialized; New:Executing

 

// At this point the workflow is waiting for the user to update the task. So the workflow runtime can hydrate the running instance to the database

 

System.Workflow.Runtime Information: 0 : Workflow Runtime: WorkflowExecutor: Got an unload request for instance 1888f8e6-145c-4220-be52-99cfd09098a7

System.Workflow.Runtime Information: 0 : 1888f8e6-145c-4220-be52-99cfd09098a7: Calling PerformUnloading(false) on instance 1888f8e6-145c-4220-be52-99cfd09098a7 hc 13970169

System.Workflow.Runtime Information: 0 : Workflow Runtime: WorkflowExecutor: Unloading instance 1888f8e6-145c-4220-be52-99cfd09098a7

System.Workflow.Runtime.Hosting Information: 0 : TimerEventSubscriptionQueue: 1888f8e6-145c-4220-be52-99cfd09098a7 Suspend

System.Workflow.Runtime Information: 0 : 1888f8e6-145c-4220-be52-99cfd09098a7: Calling Persist

 

// At this point the user marks the task as complete . So the workflow runtime can deserialize the workflow and pass it the TaskChanged event. This results in re-evaluation of the while loop

 

System.Workflow.Runtime Stop: 0 : Workflow Trace

System.Workflow.Runtime.Hosting Information: 0 : Deserialized a Workflow1 [SampleWorkflow.Workflow1] to length 8660. Took 00:00:00.0400576.

System.Workflow.Runtime Information: 0 : Workflow Runtime: WorkflowExecutor: Loading instance 1888f8e6-145c-4220-be52-99cfd09098a7

 

System.Workflow.Runtime Information: 0 : Activity Status Change – Activity: onTaskChanged1 Old:Executing; New:Closed

System.Workflow.Runtime Information: 1 : Workflow Runtime: Scheduler: InstanceId:

 

1888f8e6-145c-4220-be52-99cfd09098a7 : Scheduling entry: SubscriptionEvent((1)whileActivity1, ActivityStatusChange(‘(2)onTaskChanged1’, Closed, Succeeded))

 

 

As you can see from the snippets above, we have information about step by step execution of the workflow.

 

Workflow Failure Conditions

Some of the common reasons why a workflow can fail include:

 

a.      The WF program instance errors out because of an exception. For example, if a null object reference is encountered inside the CreateTask handler, in the workflow in Figure 1, above. This exception will cause the WF instance to move to the error state (reflected in the status column of the document library)

 

clip_image004

 

 

The tracking service will record this exception and typically log detailed information as shown below:

 

System.Workflow.Runtime Critical: 0 : Uncaught exception escaped to the root of the workflow.

    In instance 9e644d58-9990-443a-a595-1685fec2c311 in activity

Inner exception: System.NullReferenceException: Object reference not set to an instance of an object.

   at SampleWorkflow.Workflow1.TaskCreation(Object sender, EventArgs e)

   at System.Workflow.ComponentModel.Activity.RaiseEvent(DependencyProperty dependencyEvent, Object sender, EventArgs e)

   at System.Workflow.Activities.CallExternalMethodActivity.Execute(ActivityExecutionContext executionContext)

   at System.Workflow.ComponentModel.ActivityExecutor`1.Execute(T activity, ActivityExecutionContext executionContext)

   at System.Workflow.ComponentModel.ActivityExecutor`1.Execute(Activity activity, ActivityExecutionContext executionContext)

   at System.Workflow.ComponentModel.ActivityExecutorOperation.Run(IWorkflowCoreRuntime workflowCoreRuntime)

   at System.Workflow.Runtime.Scheduler.Run()

 

System.Workflow.Runtime Information: 0 : Workflow Runtime: WorkflowExecutor: Terminating instance 9e644d58-9990-443a-a595-1685fec2c311

 

One more point about exception conditions – there are times when we need to thrown an exception ourselves. For instance, if the user does not have appropriate permission, or there is missing data. In those cases, we could set a custom error message (See [2])

 

clip_image005

 

 

 

 

b.      The Application pool is recycled.  The state from a previous persist point (if there was one – typically a delay activity or OnTaskChanged activity) is persisted in the database, but since there is no retry mechanism, there is no way to re-start the persisted workflow instance. For example, if the sample WF program instance was executing inside the While activity (whileActivity1 in Figure 1) when the app pool crashed, there is no automatic way to have the workflow restarted.

One potential solution would be to model the workflow as a state machine and include retry logic. But this would add complexity to the workflow.

c.       If the correlation token is being set dynamically, there is a chance that the value gets incorrectly set in some cases. As a result, the waiting WF program instance will never receive the event. A correlation token is an identifier WF uses to tie activities to a common task – for example if CreateTask, OnTaskChanged and CompleteTask relate to a single task; they should have the same correlation token.

d.      SharePoint workflow activities (like Create Task) delay database commits until a persist point is reached. This means that a CreateTask activity will not result in a “real” task being added to the list until a persist point is reached. So any direct SharePoint OM calls that attempt to reference the created task will fail until the point a persist point is reached. Please refer to [3] to dump out the

 [1] Workflow Diagnostics

 

Add the following section to the web.config:

 

<system.diagnostics>

       <switches>

              <add name=System.Workflow LogToTraceListeners value=1 />

              <add name=System.Workflow.Runtime.Hosting value=All />

              <add name=System.Workflow.Runtime value=All />

              <add name=System.Workflow.Runtime.Tracking value=All />

              <add name=System.Workflow.Activities value=All />

       </switches>

       <trace autoflush=true indentsize=4>

              <listeners>

                     <add name=customListener

               type=System.Diagnostics.TextWriterTraceListener

               initializeData=WFTrace.log />

              </listeners>

       </trace>

</system.diagnostics>

 

 

Additionally, we can use stsadm to capture the trace messages from Workflow Infrstructure as shown below:

 

@echo off

set SPAdminTool=%CommonProgramFiles%\Microsoft Shared\web server extensions\12\BIN\stsadm.exe

 

rem echo Logging levels before…

rem “%SPAdminTool%” -o listlogginglevels

 

echo Setting levels…

stsadm -o setlogginglevel -category “Workflow Features;Workflow Infrastructure” -tracelevel Verbose -windowslogginglevel Error

 

echo Restarting SPTrace service…

net stop sptrace

net start sptrace

 

rem echo Logging levels after…

rem “%SPAdminTool%” -o listlogginglevels

 

pause

 

 

 

[2] Adding custom status message

 

1.       Add a custom status in workflow.xml

<ExtendedStatusColumnValues>

       <StatusColumnValue>

              Failed to start due to insufficient permissions

       </StatusColumnValue>

</ExtendedStatusColumnValues> 

 

2.       Add the following code for the invoking method

 private void setState1_MethodInvoking(object sender, EventArgs e)

{

      ((Microsoft.SharePoint.WorkflowActions.SetState)sender).State = ((Int32)SPWorkflowStatus.Max);

}

 

 [3] Code to extract the persisted workflow state

 

Since the workflow runtime is finicky about changes such as adding private variables, it is useful to dump the persisted state.

 

System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(

       “select InstanceData from dbo.workflow  where  InstanceDataSize > 0″);

System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(

       “Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=WSS_Content_Portal;Data Source=CTSDEV1”);

conn.Open();

cmd.Connection = conn;

byte[] image = (byte[])cmd.ExecuteScalar();

System.IO.FileStream fs = new System.IO.FileStream(@”c:\data.gz”, System.IO.FileMode.CreateNew);

fs.Write(image, 0, image.Length);

fs.Flush();

fs.Close(); 

 

 

 

 

 

22 Responses to “Debugging SharePoint Workflows”


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