[389-users] Re: Replication Delay

On Fri, 2016-03-25 at 02:45 +0530, shardulsk wrote:
> We recently upgraded from Centos 5.4 389-ds Version 1.1.2 to Centos 6.7
> 389-ds version 1.2.11
>
>
> 389-console-1.1.7-1.el6.noarch
> 389-ds-base-1.2.11.15-48.el6_6.x86_64
> 389-ds-console-1.2.6-1.el6.noarch
> 389-ds-base-libs-1.2.11.15-48.el6_6.x86_64
> 389-admin-console-1.1.8-1.el6.noarch
> 389-adminutil-1.1.19-1.el6.x86_64
> 389-admin-1.1.35-1.el6.x86_64
>
>
> The setup has a single master, hub and 5 replicas. For some reason we are
> experiencing replication delays of upto 40 secs between hub and replicas.
> This did not occur in the old setup.  At the time access logs showed an
> average of  1000 MOD operations per minute.
>

For a start, ldap is an async replication protocol, not a sync one.

With that setup, remember the hub can only provide updates to one replica at a time. So they each have to wait in turn.

You can see this by turning on the replication logging in errorlog-level to 8192.


--
Sincerely,

William Brown
Software Engineer
Red Hat, Brisbane