>> chandan jain <chandandevops(a)gmail.com> schrieb am
10.03.2021 um 09:46 in
Thanks Ulrich, but Won't MMR behind a loadbalancer cause data
inconsistentcy if I allow writes to both nodes. As per openldap
documentation, mirror mode is not a multi provider solution , as writes go
to just one of the mirror at a time in a 2 node setup.
That's correct, but the replication starts practically immediately, so usually the
data is up-to-date within a second if the other side is ready and reachable. After all
LDAP was never designed to be a real-time database.
I am confused which one shall I use, N node mirror mode setup behind a
load balancer as suggested by Quanah (write to one provider and read with
other mirror pool members) or N nodes with multi provider setup spreading
writes to both nodes.
A load-balancer that is not doing round-robin (but some other policy, like response time
or throughput) probably would be OK.
On Wed, Mar 10, 2021, 13:29 Ulrich Windl <Ulrich.Windl(a)rz.uni-regensburg.de>
> >>> chandan jain <chandandevops(a)gmail.com> schrieb am 09.03.2021 um
> > Thanks,
> > Mirror mode configuration cannot be horizontal scaled what I understood
> > writes are going to one of the node, and other act as an active standby.
> > I want 2 or more nodes behind a load balancer which can share read/write
> > load. A kind of active active setup.
> I wonder: If you have a 2-node MMR setup fed through a loadbalancer for
> writing, it there really a performance benefit over sending all updates to
> one node that replicates the changes to the other?
> > Regards
> > Chandan Jain
> > On Mon, Mar 8, 2021, 23:44 Quanah Gibson-Mount <quanah(a)symas.com> wrote:
> >> --On Sunday, March 7, 2021 8:39 PM +0530 chandan jain
> >> <chandandevops(a)gmail.com> wrote:
> >> >
> >> >
> >> > Thanks, Quanah
> >> >
> >> >
> >> > Is it possible to direct upgrade from 2.4.32 to latest version.
> >> If you (temporarily) stick with the same backend, and in this case, if
> >> that
> >> same backend is linked to the exact same version of BDB, yes. I.e.,
> >> compile the back-bdb/hdb backends against the same version of BDB,
> >> upgrade,
> >> and then migrate to back-mdb.
> >> > Also, can we horizontal scale a 2 node mirror mode setup? I am
> >> > after seeing suggestions on different sites.
> >> I don't understand the question here. Mirror mode is just a
> >> of MMR with a load balancer in front.
> >> --Quanah
> >> --
> >> Quanah Gibson-Mount
> >> Product Architect
> >> Symas Corporation
> >> Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
> >> <http://www.symas.com>