How to upgrade Percona xtradb cluster 5.7 to 8(Three node)

[Gajendra]

Is there any official documentation for Percona xtradb cluster rolling upgrade

or i have to follow the same approach like 5.6 to 5.7 rolling upgrade ?

Thanks

[matthewb]

https://www.percona.com/doc/percona-xtradb-cluster/LATEST/howtos/upgrade_guide.html#not-recommended-to-mix-pxc-5-7-nodes-with-pxc-8-0-nodes

Due to the incompatible changes between 5.7 and 8.0, it is not recommended to do a rolling upgrade. Your best solution is to shut down the cluster, upgrade each node to 8.0, and then bring the cluster back online.

Be sure to read all of the 8.0 “gotchas” like the new password system, encryption on by default, etc.

[Gajendra]

Thanks matthewb for your help