connection node_2; connection node_1; connection node_2; SELECT @@wsrep_slave_threads; @@wsrep_slave_threads 1 SET GLOBAL wsrep_slave_threads=2; Got one of the listed errors Got one of the listed errors Got one of the listed errors Got one of the listed errors SET GLOBAL wsrep_slave_threads=DEFAULT; connection node_1; create table t1(a int not null primary key) engine=innodb; insert into t1 values (1); insert into t1 values (2); connection node_2; # Wait until one of the appliers has exited select count(*) from t1; count(*) 2 SELECT @@wsrep_slave_threads; @@wsrep_slave_threads 1 connection node_1; drop table t1;