Starting with the experimental release of Percona XtraDB Cluster 8.0, we have made changes to the SST process to make the process more robust and easier to use. mysqldump and rsync are no longer supported SST methods. Support for mysqldump was deprecated starting with PXC 5.7 and has now been completely removed. MySQL 8.0 introduced [&]

https://www.percona.com/blog/2019/10/04/percona-xtradb-cluster-8-0-experimental-release-sst-improvements/