(ITS#9061) LDAP replication issue on a big network

[alex.s@wildix.com]

Full_Name: Alex
Version: 2.4.44+dfsg-5+deb9u2
OS: Debian 9
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (154.41.3.130)


Hello

I have some issues with replication between Master and Slave LDAP servers.

Preconditions data:
I have a Master server with a huge LDAP data
And also I have about 200 Slave servers around the world which have a data
replica in their databases.

What happened:
I have applied a bckup on Master server. (Actually data have not changed except
entryCSN)

entryCSN has been deleted from backup previously, before apply, for actualise
data in LDAP database.

As a result I had a situation when all Slave servers starts replication.

The first question is: how I can avoid full replication after apply backup on
Master? I understand that entryCSN changed and LDAP should sync some objects.
But can I use another way to actualize the data in LDAP database instead of
entryCSN?

The second question is: after apply backup and restarts the Master server I had
a problem with local LDAP because all Slave servers start connecting and start
their replication. In this case LDAP on Master server not responding even on
localhost via ldapsearch. May I change some parameters to increase concurrent
connections? Because LDAP starts not responding if the quantity of simultaneous
connected of Slave servers exceeds 10-15

Thank you in advance
Best regards, Alex