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)

However in support-files/wsrep.cnf.sh there are still the old default values which can be misleading.