Can anyone explain to me what is the difference between the timeout configuration on the server vesus on the client ? For example, what would happen if a client sets the sendTimeout to 5 minutes while the configuration on the server has it set for 1 minute ? Does the client prevail since it initiates the communication ?
Thanks for your help !
I think I got this, take a look at http://omsite.blogspot.com/2008/04/playing-with-wcf-nettcpbinding-timeouts.html.
When client initiates the call to server, the client side sendTimeout and server side receiveTimeout are in effect. The client has to send(or push) all the data before receiveTimeout set on server expires. The server has to complete its operation and return the results back to client before the sendTimeout set on the client expires.
If the roles are reversed, meaning server is opening communication back to client (like in a callback etc), then sendTimeout on server and receiveTimeout on client come into play.
There is also OpenTimeout and CloseTimeout which control the channel connection establishing timeouts and work at lower channel levels (line sockets etc)
In tests the scenario that you asked. The timeout of the request is 5 minutes, which was defined in the client
On the Client-side Timeouts
SendTimeout – used to initialize the OperationTimeout, which governs the whole process of sending a message, including receiving a reply message for a request/reply service operation. This timeout also applies when sending reply messages from a callback contract method.
ReceiveTimeout – is not used
On the Service-side Timeouts
SendTimeout are the same as on the client
ReceiveTimeout – used by the Service Framework Layer to initialize the session-idle timeout which controls how long a session can be idle before timing out.
See https://learn.microsoft.com/en-us/dotnet/framework/wcf/feature-details/configuring-timeout-values-on-a-binding
Related
I am using Visual Studio 2012 to generate a web service to be used by a winforms client. I created the client side by using "add service reference". This winforms client is a .net c# replacement of an old VB 6 app. Previously, in the VB app there were external settings for timeout values including the following:
DNS timeout
Connect timeout
Request timeout
The DNS timeout would work when the endpoint host address is a FQDN forcing a DNS lookup. The timeout value here would place a limit on the amount of time to wait for DNS resolution.
The connect timeout would place a limit on the amount of time the winforms client would wait to establish an http connection to the server. DNS lookup would have been successful.
The request timeout would place a limit on the amount of time to wait for the request to return after an http connection was successful. This would come into play if a long running query took too long after the web service call was initiated.
Is there something similar to the above in .net 4.0. I would like to be able to configure this in the app.config. I do know about the below.
<bindings>
<basicHttpBinding>
<binding name="IncreasedTimeout"
openTimeout="12:00:00"
receiveTimeout="12:00:00" closeTimeout="12:00:00"
sendTimeout="12:00:00">
</binding>
</basicHttpBinding>
Could these map to the ones I need or does it really not matter?
thanks
The OpenTimeout setting for the WCF binding is for the length of time to wait when opening the channel, so I believe this will be analogous to your old Connect timeout. This should be fast so you normally would only want to specify a few seconds to wait (30 or less), not 12 hours.
The WCF CloseTimeout is for when a Close Channel message is sent, and this is how long to wait for an acknowledgement. This may not have an equivalent in your old architecture. Again, this should be fast and should only need a few seconds.
The WCF SendTimeout (for the client config) essentially covers the time for the Client to send the message to the service, and to receive back the response (if any). This would correspond to your old Request timeout. This may need to be for several minutes if your server takes a while to process things.
The WCF SendTimeout (for the server config) is for when you want callbacks, so that the Server knows how long to wait for acknowledgement that its callback was received.
The WCF ReceiveTimeout does not apply to client-side configuration. For Server-side config the ReceiveTimeout is used by ServiceFramework layer to initialize the session-idle timeout (to be honest I don't really know what that is)
This MSDN discussion may be helpful http://social.msdn.microsoft.com/Forums/vstudio/en-US/84551e45-19a2-4d0d-bcc0-516a4041943d/explaination-of-different-timeout-types?forum=wcf
As a final note, having really big timeout values isn't a good idea unless you definitely have long running requests. This is because you can run out of available resources on your server if the client isn't closing the connections properly.
the service endpoint socket connection always abort 10 mins after last use.
the above image shows that the last use of the end point was 10:18:21. after 10 mins, activity Aborted 'System.ServiceModel.Channels.ServiceChannel' happened. is the 10 mins time out a default setting for WCF endpoint socket connection? can I set the timeout to be infinite? notice the abortion happens on a separate thread(thread 16).
or did I not configure the endpoint correct on the service endpoint?
The socket connection timeouts needs to be configured on both client and server side (smaller of the two will prevail). These should be done via binding configuration (in config or code). The timeouts can be done via inactivityTimeout setting of a reliableSession, in combination with recieveTimeout of the netTcpBinding. You can also consider using idleTimeouts in the connection pool settings option of netTcpBinding. It is typically not recommended to set infinite timeouts unless you have very specific needs that need to be met and have service usage parameters that safegaurd against infinite timeouts.
[ServiceContract]
public interface Service
{
[OperationContract(IsOneWay = true)]
void ServiceMethod();
}
I set server's code with IsOneWay = true, because the client does not care about the server's result and the server's method may need run a long time (e.g.30 mins) in some cases.
But I found the client still waits for the server's method to be finished. After the server finished in 30 mins, client requests again, report the CommunicationException:
"The socket connection was aborted. This could be caused by an error
processing your message or a receive timeout being exceeded by the
remote host, or an underlying network resource issue. Local socket
timeout was '00:01:00'".
I think the client still wait the result (default receiveTimeOut is 10 mins), then lead to timeout. I use WCF 3.0.
Can you help me? Thank you!
A one-way call in WCF is not the same thing as an asynchronous call.
Even though the client making a one-way call will not receive a response from the service, if the service does not have a thread available to dispatch or queue the incoming client request then the client will hang and eventually timeout if no dispatcher thread becomes available within the timeout period.
The number of available threads and the size of the request queue are managed by WCF and are determined by the service concurrency mode, session mode, and whether the service was configured with reliable messaging, amongst other factors.
MSDN ServiceBehviorAttribute.concurrencyMode states:
Setting ConcurrencyMode to Single instructs the system to restrict
instances of the service to one thread of execution at a time, which
frees you from dealing with threading issues.
That means that server side all calls on the service will come in on a unique thread. Which is great as you don't have to worry about multithreading but also not so great in that if you block that one thread with a long operation then other calls from your client that happen while its processing will not get through. Hence the exception.
ConcurrancyMode = Single is the default. You could try setting the concurrancy mode to Multiple - which will mean that calls will now come in on random threadpool threads and if one of those is busy processing a request another one is available for another request. But because the enviroment is now multithreading you will have to protect server objects from access by multiple thread with locks or other syncronisation mechanisms.
Have you tried re-generating the service client? It may be that the client still has a reference to a synchronous operation, whereas the server has been re-defined as one way / async.
I have created a service which uses WCF for communication. Very basic. The server side is set up to listen like this where IEdWCF is my service contract which calls various methods on the server, ntb is a NetBinding with a ReceiveTimeout set to 60 minutes, and strHostURL is on localhost:
Host.AddServiceEndpoint(typeof(IEdWCF),
ntb,
new Uri(strHostURL));
The thing is that I have some items I want to send through but allow a longer processing time to (the client awaits a reply from the server and keeps getting dropped by the server)
I know on my client side I can extend the request by casting the channel as an IContextChannel and setting the OperationTimeout property.
I'd like to be able to do the same thing I'm doing with the client on the server.
Is this possible? Is there some way to dynamically change the setting on the server binding?
I have already asked a similar question here: WCF Service calling an external web service results in timeouts in heavy load environment but I've got a better idea now as to what's happening so posting a new question.
This is what is happening:
.NET client sends multiple requests at the same time to a WCF service (if it helps - I'm replicating this scneario by using Visual Studio Load Tests)
The client has got a "sendTimeout" set to 5 seconds
The WCF service receives it and start processing it. The processing involves sending a request to an external service which could take about 1 second to come back with a response
This is where I think the problem is: the client has sent many requests to the service and since the service is still busy processing the concurrent requests, some of the reqeusts from the client are timing out after 5 seconds
I have tried the following:
Changed the InstanceContextMode to PerCall
Increased the values of maxConcurrentCalls & maxConcurrentInstances
Increased the value of connectionManagement.maxconnection in machine.config
But none of that seems to be making any difference. Does anyone has any idea how can I ensure that I don't run into this timeout issue?
OK, you say WCF and that is not enough. What binding are you using and where are you hosting it? If you are using IIS, the could be different underlying problem than self-hosting.
The likely reason is the small number of ThreadPool size. You can use ThreadPool.SetMaxThreads() to change this but beware this is a sensitive value. Have a look here.
Check out the following link:
http://weblogs.asp.net/paolopia/archive/2008/03/23/wcf-configuration-default-limits-concurrency-and-scalability.aspx
I'm not sure what you're trying to achieve. Since the WCF service is doing a time consuming operation, you can't overload it and expect it to function. You can do the following (check the link about to set the following):
Increase the receiving capacity of the wcf service
Increase the send timeout of the service
Increase the send timeout of the client
Increase the receive timeout of the client
Limit the outgoing connections to the wcf service
The best and most robust option would be to configure and use MSMQ with the WCF service.