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 >
