CMIS REST interface slow performance with multiple repositories

When using the REST interface provided by CMIS, if you have multiple repositories on your docbroker, you may have noticed a slight delay in the response to your queries. I came across this issue in an environment with multiple repositories (+10), where additionally, every dmadmin user has different password, so not only we had this delay on the responses, we also had a log full of authentication errors.

If the delay was slighty concerning, the errors thrown on the log pointed to something more serious (and most likely a known issue in D2).

With a little bit of debugging and decompiling, we found out the culprit on opencmis-dctm-connector-XXX.jar, in the com.emc.documentum.fs.cmis.impl.cmisoperations.impl.GetRepositoryInfosOperationHandler class. This (surprise surprise) is the same situation that we saw with D2. Check the getRepositoryInfoList method:

private List getRepositoryInfoList(CallContext context, GetRepositoryInfosOperationInputBean inputBean, List repositoryEntries)
   {
     List repositoryInfoList = new ArrayList();
     for (CmisRepositoryEntryType repositoryEntry : repositoryEntries)
     {
       String repositoryId = repositoryEntry.getRepositoryId();
       if (CmisAuthenticationManager.INSTANCE.authenticate(context, repositoryId)) {
         repositoryInfoList.add(getRepositoryInfo(context, inputBean, repositoryEntry));
       }
     }
     return repositoryInfoList;
   }

Yes, they’ve done it again. The code tries to authenticate with the provided credentials in evey single repository known to the docbroker. Luckily for us, this method has the requested repository (i.e.: http//cmis…/resources/RepositoryName/…) in the context variable, so you can just do a comparison there and “magically” improve the perfomance (or wait until Opentext releases a “fix”).

Note that this happens in every version I could test from 16.4 to 20.4 😦

Java 11 Documentum REST Client examples

On Java 11, HttpClient was added to Java (no more need to use Apache’s HttpClient). and this presents some changes to the usual way of consuming Documentum REST services. The main “issue” is that there is no MultiPart class provided to easily handle multipart content (create a document), so we need to do it manually. I’ve upload a project to GitHub with basic examples of using Documentum REST services with Java 11: DctmRest11