Since MariaDB 10.1.17 the new default values for wsrep_max_ws_rows and wsrep_max_ws_size were set:

wsrep_max_ws_rows

Default Value:
0 (>= MariaDB Galera 10.0.27, MariaDB 10.1.17)
131072 (<= MariaDB Galera 10.0.26, MariaDB 10.1.16)
wsrep_max_ws_size

Default Value:
2147483647 (2GB, >= MariaDB Galera 10.0.27, MariaDB 10.1.17)
1073741824 (1GB, <= MariaDB Galera 10.0.26, MariaDB 10.1.16)