Help! Node won't join Cluster after Restart.

Hi Folks!

I had my new XtraDB-Cluster (5.7.19, Debian 9) up and running for a while and today I decided to restart one of the three Nodes. That was apparently not a good Idea, because now it’s not willing to rejoin the Cluster anymore. I really tried out what I could, but got the following Error, over and over again:

“mysql[119540]: WSREP: Failed to recover position:”

Here’s my /etc/mysql/percona-xtradb-cluster.conf.d/mysqld.cnf which flawless works on the other 2 Nodes:

wsrep_provider=/usr/lib/libgalera_smm.so
wsrep_cluster_name=pxc-cluster
wsrep_cluster_address=gcomm://xx.xx.107.133,xx.xx.107.134,xx.xx.107.135
wsrep_node_name=myname
wsrep_node_address=xx.xx.107.134
wsrep_sst_method=xtrabackup-v2
wsrep_sst_auth=sstuser:thepassword
pxc_strict_mode=ENFORCING
binlog_format=ROW
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2

Also starting the Node, without making any changes to mysqld.cnf, and filling up the wsrep* variables manually (wsrep_cluster_address, global wsrep_provider, wsrep_node_address, wsrep_sst_auth) did not help.

My Boss will be killing me, please help!

With best regards,
DBA Jay

Can you please share related mysql error log entries from joiner and donor node. Along with that, please share any innobackup* logs from joiner/donor data directory.