Galera cluster blocks concurrent commits and leads to server hang

Start 3 node cluster

-- Node1

CREATE TABLE test.tbl (

id int NOT NULL AUTO_INCREMENT, 

t_id varchar(10) NOT NULL, 

dt timestamp DEFAULT current_timestamp(), 

a_id int DEFAULT 0, 

PRIMARY KEY (id), 

INDEX ix_dt (dt)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 DEFAULT COLLATE=latin1_swedish_ci;

-- Node3

Run mysqlslap test on node3

sudo mysqlslap -uroot -i 50000 -c 5 --create-schema=test --no-drop --delimiter=";" --query="insert into test.tbl (t_id, a_id) values('100100',1);insert into test.tbl (t_id) values('200200');" &

Node3 goes into hang mode with a commit state of "Waiting for prior transaction to commit".

|  48 | root        | localhost | NULL    | Sleep   |   19 |                                         | NULL                                                                       |    0.000 |

| 844 | root        | localhost | test | Query   |   18 | Commit                                  | insert into test.tbl (t_id, a_id) values('100100',1) |    0.000 |

| 845 | root        | localhost | test | Query   |   18 | Commit                                  | insert into test.tbl (t_id) values('200200')               |    0.000 |

| 846 | root        | localhost | test | Query   |   18 | Commit                                  | insert into test.tbl (t_id, a_id) values('100100',1) |    0.000 |

| 847 | root        | localhost | test | Query   |   18 | Waiting for prior transaction to commit | insert into test.tbl (t_id, a_id) values('100100',1) |    0.000 |

| 848 | root        | localhost | test | Query   |   18 | Commit                                  | insert into test.tbl (t_id, a_id) values('100100',1) |    0.000 |

| 849 | root        | localhost | NULL    | Query   |    0 | starting                                | show processlist                                                           |    0.000 |

+-----+-------------+-----------+---------+---------+------+-----------------------------------------+----------------------------------------------------------------------------+----------+

48 rows in set (0.001 sec)