quanah@symas.com wrote:

--On Thursday, April 09, 2015 5:42 AM +0000 quanah@openldap.org wrote:

...

Full_Name: Quanah Gibson-Mount Version: 2.4.39 OS: Linux 2.6 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (50.25.188.166)

When one has an MMR setup using delta-syncrepl, and the masters get into a situation where one is out of sync, or adding a new MMR node to an existing cluster, things will be broken until the new/reloaded node has a write op that goes to the accesslog DB. In an existing cluster, where a node is being reloaded, it causes all nodes to go into an endless looping fallback sync until that write occurs.

One possible fix for this, would be to refuse to delete the final entry in the accesslog during the purge phase. That way, the accesslog would never be empty. I'm not sure how difficult this would be to implement, code wise.

A patch which skips deleting the final entry, and creates an initial dummy log entry if needed, is available in https://github.com/quanah/openldap-scratch/tree/its8100 for testing.