Forgot this info:

OpenLDAP 2.4.39 with back-mdb

syncrepl: refreshAndPersist with keepalive set, authc with SASL/EXTERNAL based on TLS client certs

On Fri, 15 Aug 2014 12:21:30 +0200 "Michael Ströder" michael@stroeder.com wrote

HI!

I have a replication topology with providers running with MMR and a layer of r/o consumers..

• spread across three data centers
• in two different countries (DE and foreign country)

Network traffic between the countries has higher latency so consumers are only accessing providers within the same country. Write operations go nearly 100% to a single provider in Germany.

All systems are using these overlays:

• slapo-ppolicy (mostly for password expiry)
• slapo-lastbind overlays
• slapo-accesslog (yes, also on consumers)

Now occasionally contextCSN values differ most times for a couple of minutes on the consumers in the foreign country from their local providers.

I cannot tell exactly which conditions are causing this. But I observed that most times there was a login failure on the provider in Germany which results in 'pwdChangedTime' being set and replicated to the consumers. Most times followed by 'authTimestamp' being correctly set.

So I wonder whether the differences of the contextCSN values could be caused by 'pwdChangedTime' and 'authTimestamp' being replicated to providers but not to consumers.

Any clue? Thanks in advance.

Ciao, Michael.