>>> chandan jain <[email protected]> schrieb am 10.03.2021 um 09:46 in Nachricht <CAMojrsUnrA_LYH0tHqCZoCTezu8mXPCys=vheehtbovrwaw...@mail.gmail.com>: > 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. Regards, Ulrich > > Regards > Chandan > > On Wed, Mar 10, 2021, 13:29 Ulrich Windl <[email protected]> > wrote: > >> >>> chandan jain <[email protected]> schrieb am 09.03.2021 um 10:58 >> in >> Nachricht >> <camojrsxkohnv0fp_gwoeeadnzdxeliq3ajr-w0pjjgft5kb...@mail.gmail.com>: >> > Thanks, >> > >> > Mirror mode configuration cannot be horizontal scaled what I understood >> as >> > 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, >> Ulrich >> >> > >> > Regards >> > Chandan Jain >> > >> > On Mon, Mar 8, 2021, 23:44 Quanah Gibson-Mount <[email protected]> wrote: >> > >> >> >> >> >> >> --On Sunday, March 7, 2021 8:39 PM +0530 chandan jain >> >> <[email protected]> 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 >> confused >> >> > after seeing suggestions on different sites. >> >> >> >> I don't understand the question here. Mirror mode is just a >> configuration >> >> 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> >> >> >> >> >> >> >>
