The Problem State Snapshot Transfer can be a very long and expensive process, depending on the size of your Percona XtraDB Cluster (PXC)/Galera cluster, as well as network and disk bandwidth. There are situations where it is needed though, like after long enough node separation, where the gcache on other members was too small to [&]

https://www.percona.com/blog/how-to-recover-percona-xtradb-cluster-5-7-node-without-sst/