Thank for your replies. I see, in that way then failover won't be possible as if the main/major DC is down.
Is there something i can do using hierarchical quorum groups or observers ? I am quiet confused to achieve this setup somehow, as how someone would build a failover over 2 dc's :-/ On Mon, Mar 6, 2017 at 11:08 PM, Van Klaveren, Brian N. < [email protected]> wrote: > Or, an extra server in a third datacenter to break the tie. > > Brian > > > > On Mar 6, 2017, at 2:05 PM, Jordan Zimmerman <[email protected]> > wrote: > > > > This scenario is not possible. An even number of servers doesn't help > you as a quorum in ZooKeeper is (N/2)+1. So, if you put 2 servers in each > DC, a network partition would disable BOTH DCs. (4/2)+1 == 3. So, the only > option is to choose one of the DCs as the main DC and put an extra server > there. This way you could lose the "minor" DC. > > > > -Jordan > > > >> On Mar 6, 2017, at 11:34 AM, Le Cyberian <[email protected]> wrote: > >> > >> Hi Guys, > >> > >> I would like to have Kafka Cluster which is dependent on Zookeeper like > >> many other great projects out their. Kafka would have 4 nodes as its > >> cluster since their having even number is not a problem because it does > >> leader election based its config it keeps in zookeeper. > >> > >> My scenario is having two server rooms on different floors having fiber > >> connectivity with each other so network latency / lag is almost like a > >> local connection. > >> > >> However, I would like to implement zookeeper cluster between both of > them > >> for auto-failover / redundancy purposes. So if one server room is down > >> other should work properly. > >> > >> For example: on a 5 node zookeeper cluster distributed on both of the > >> server rooms with 3 in one and 2 in other would give me 2 node failure > >> tolerance, However if the server room which has 3 servers is down then > >> ensemble would be broken and split brain. > >> > >> Can you please suggest how to achieve this to have failover / redundancy > >> between two server rooms or two locations lets say ? > >> > >> Is it possible to run 3 node cluster in each server room and have some > sort > >> of master-master between them ? > >> > >> Thank for your time and helping out in advance. > >> > >> Kind regards, > >> > >> Le > > > >
