Gaurav You can find the compatibility matrix for Zk here: https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=240882784#KIP902:UpgradeZookeeperto3.8.1-Compatibility,Deprecation,andMigrationPlan
More specifically, for your use case of migrating from Kafka 2.7 to Kafka 3.4, you will not face any hiccups. Kafka 2.7 uses Zk version 3.5.x and Kafka 3.4 uses Zk version 3.6.x. Quoting from Zookeeper's documentation for 3.6.0 [1] *"This is the first release for 3.6 branch. It comes with lots of new features and improvements around performance and security. It is also introducing new APIS on the client side. ZooKeeper clients from 3.4 and 3.5 branch are fully compatible with 3.6 servers. The upgrade from 3.5.7 to 3.6.0 can be executed as usual, no particular additional upgrade procedure is needed."* Hence, you can update your Zk cluster first and upgrade it to 3.6.x. Your existing 2.7 brokers will continue to work since they will be using Zk 3.5 clients to connect to the Zk cluster. 3.5 clients are compatible with Zk 3.6 as per above statement. After the Zk cluster upgrade, you can perform a rolling upgrade of your kafka brokers. Hope this helps. [1] https://zookeeper.apache.org/releases.html -- Divij Vaidya On Wed, Jun 14, 2023 at 2:41 PM Gaurav Pande <gaupand...@gmail.com> wrote: > Hi Luke, > > Thanks for helping here , iam using Zookeeper that comes with Apache > kafka itself , is the same ? So not using external zk binary. > > Regards, > Gaurav > > On Wed, 14 Jun, 2023, 17:43 Luke Chen, <show...@gmail.com> wrote: > > > Hi Gaurav, > > > > Please check Zookeeper's doc for upgrading guide. > > > > Thanks. > > Luke > > > > On Wed, Jun 14, 2023 at 12:03 PM Gaurav Pande <gaupand...@gmail.com> > > wrote: > > > > > Hi Guys, > > > > > > Could anyone help on this query? > > > > > > Regards, > > > Gaurav > > > > > > On Tue, 13 Jun, 2023, 11:40 Gaurav Pande, <gaupand...@gmail.com> > wrote: > > > > > > > Hello Guys, > > > > > > > > Iam new in this space, I was going through the documentation of > > Upgrading > > > > Kafka brokers to 3.4 from any previous version with Zookeeper mode , > > > but I > > > > couldn't find any Upgrade process for Zookeeper. > > > > > > > > Iam using Zookeeper provided by Kafka binary in this case 2.7.0 and > not > > > > installed zk externally. > > > > > > > > So what's the process of Upgrading Zookeeper? And should I upgrade > > > > Zookeeper first or 3 Kafka brokers? > > > > > > > > Note - I have single Zookeeper and 3 Kafka brokers at this point. > > > > > > > > Regards, > > > > Gaurav > > > > > > > > > >
