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Re: In MirrorMode - proxy or external frontend needed?

Quanah Gibson-Mount wrote:

--On Friday, July 06, 2012 1:41 PM +0200 Pieter Baele
<pieter.baele@gmail.com> wrote:


I've 2 servers in MirrorMode, a part of the tree wil also be partially
replicated to 3 slaves.

Do I really need an LDAP proxy or Load balancer(s) so writes are only
directed to one server?
In our LDAP, the number of writes will be very very low,  most of them
will be reads (authentication, ssh keys, puppet nodes...)

Any benefit in using 'normal' n multimaster instead of MirrorMode?


You don't have to redirect writes to just one server and set up heartbeat
monitoring etc?  Mirrormode is just N-way multimaster with a proxy/balancer
in front of it.  Whether or not that is what you want is up to you to
decide. ;)

Personally, I'm just using delta-syncrepl based N-Way MMR.
The virtue of using MirrorMode is that you know for certain that you will never have an unresolvable data inconsistency due to conflicting writes being applied at two different masters at once. 

Aside from that, yes, it's just N-Way multimaster.

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/