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From sunil chaudhari <sunilmchaudhar...@gmail.com>
Subject Re: Adding additional nodes to Existing ZK cluster
Date Sun, 08 Mar 2020 04:40:00 GMT
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 <pmbuko@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 <bj9306@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
>
>

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