Hi Peter, That was great explanation. However I have question about the last stage where you mentioned to update the zookeeper server in the services where single zookeeper is used. Why do I need to do that? Is it because only single zookeeper is used and you want to make sure high availability of zookeeper?
What if tomorrow I add 2 more instances of zookeeper, total 5. Is it required to update 2 new zK instances to my kafka brokers? Regards, Sunil. On Sat, 7 Mar 2020 at 11:08 PM, Peter Bukowinski <pmb...@gmail.com> wrote: > This change will require brief interruption for services depending on the > current zookeeper — but only for the amount of time it takes the service on > the original zookeeper to restart. Here’s the basic process: > > 1. Provision two new zookeepers hosts, but don’t start the service on the > new hosts. > 2. Edit the zoo.cfg file on all hosts to contain the following lines > (assuming default ports): > > server.1=ORIGINAL_ZK_IP:2888:3888 > server.2=SECOND_ZK_IP:2888:3888 > server.3=THIRD_ZK_IP:2888:3888 > > 3. Ensure the myid file on the second node contains ‘2’ and on the third > node contains ‘3' > 4. Start the second and third zookeeper services and ensure they have > become followers: > > echo stat | nc ZK2_IP 2181 | grep state > echo stat | nc ZK3_IP 2181 | grep state > > 5. Restart the original zookeeper service and then check the state of all > three zookeepers > > echo stat | nc ZK1_IP 2181 | grep state > echo stat | nc ZK2_IP 2181 | grep state > echo stat | nc ZK3_IP 2181 | grep state > > You should see that one of the new zookeepers has become the leader. > > Now all that’s left to do is update your zookeeper server strings in the > services that were previously using the single zookeeper. > > Hope this helped! > > — > Peter > > > On Mar 6, 2020, at 12:50 PM, JOHN, BIBIN <bj9...@att.com> wrote: > > > > Team, > > I currently have a 1 node ZK cluster and which is working fine. Now I > want to add additional 2 more nodes to ZK cluster. Could you please provide > best practice so I don't loose existing data? > > > > > > Thanks > > Bibin John > >
