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Strange timeout issues with Alfresco 4

katie

I am successfully retrieving documents (amongst other operations) from Alfresco using the DotCMIS library in C#. I have no issues when connecting to our older Alfresco 3.3 server.

When using Alfresco 4, however, the DotCMIS calls (fairly reliably) stop responding after I've fetched *any* two (sometimes three) documents, even the same one each time (I have created the same documents on both servers, to rule out anything peculiar with the documents themselves.) In this state, any subsequent call eventually raises a Timeout exception, although sometimes they will just magically start working again, most of the time the only resolution is to restart my application. It's just peculiar because this problem does not occur when I am using the older Alfresco server, I can fetch as many documents as I like with no issues.

I don't think the stack trace is very useful:

   at DotCMIS.Binding.AtomPub.AbstractAtomPubService.Read(UrlBuilder url) in chemistry-dotcmis-0.4-src\src\binding\atompub\atompub.cs:line 436
   at DotCMIS.Binding.AtomPub.AbstractAtomPubService.GetObjectInternal(String repositoryId, IdentifierType idOrPath, String objectIdOrPath, Nullable`1 returnVersion, String filter, Nullable`1 includeAllowableActions, Nullable`1 includeRelationships, String renditionFilter, Nullable`1 includePolicyIds, Nullable`1 includeAcl, IExtensionsData extension) in chemistry-dotcmis-0.4-src\src\binding\atompub\atompub.cs:line 742
   at DotCMIS.Binding.AtomPub.ObjectService.GetObject(String repositoryId, String objectId, String filter, Nullable`1 includeAllowableActions, Nullable`1 includeRelationships, String renditionFilter, Nullable`1 includePolicyIds, Nullable`1 includeAcl, IExtensionsData extension) in chemistry-dotcmis-0.4-src\src\binding\atompub\atompub.cs:line 1712
   at DotCMIS.Client.Impl.Session.GetObject(String objectId, IOperationContext context) in chemistry-dotcmis-0.4-src\src\client\client-impl.cs:line 532
   at DotCMIS.Client.Impl.Session.GetObject(IObjectId objectId, IOperationContext context) in chemistry-dotcmis-0.4-src\src\client\client-impl.cs:line 500
   at DotCMIS.Client.Impl.Session.GetObject(IObjectId objectId) in chemistry-dotcmis-0.4-src\src\client\client-impl.cs:line 490
   at GetDocumentFromID(String document_ID) in CMISDocumentManager.cs:line 533‍‍‍‍‍‍‍

The call I am making is

ob = session.GetObject(id) as IDocument;‍

I have checked the logs on the Alfresco server and there is nothing at all related to the failed calls.

Has anybody else seen this? I can't rule out that my code is at fault, but there must be some key difference between the versions of Alfresco that cause this behaviour if this isn't a problem with Alfresco's CMIS implementation…

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Comments

jpotts

Are you using the deprecated web script based CMIS implementation (has a service URL of /alfresco/s/api/cmis or similar) or the new OpenCMIS based CMIS implementation (has a service URL of /alfresco/cmisatom or /alfresco/cmisws)?

The new OpenCMIS implementation did not exist until Alfresco 4.

There are definitely implementation differences between the two.

Jeff

katie

Hi Jeff,

I'm using the OpenCMIS implementation at /alfresco/cmisatom (although we might temporarily change this due to another issue, so I will investigate if this problem persists once this change has been made.)

Thanks,
Katie.

rrosic

Hi,

we are having same issues as Katie!

For better understanding: we are doing migration from FileNet P8 to Alfresco through custom app, based on CMIS. We can do maybe several dozen files before timeout.

We are using Alfresco EE 4.0.2 with latest DotCMIS (0.4) from Apache Chemistry.
Binding is AtomPub. There is nothing in server logs.
After first timeout all subsequent operations also timeout.

Any new insights?

Best Regards,
Robert

katie

Further to this, I have exactly the same issue with another DMS, so this does not appear to be a problem with Alfresco specifically. I have logged an issue with the Chemistry project to see if they can make any sense of this: https://issues.apache.org/jira/browse/CMIS-559

bswartz-dorman

Katie, Did you ever resolve this?