I am running OpenLDAP 2.3.39 (locally built) on Red Hat Enterprise Linux
4 servers with several replicas. We use delta-syncrepl to keep the
replicas in sync with the master server.
The issue we have now experienced a few times is that if there are a LOT
of updates in the nightly batch update process, that not all of the
updates make it to the replicas but the contextcsn stays in sync, so we
see strange errors that eventually lead us to see that the replicas are
not current even though they think they are.