AWS: MariaDB RDS – kill: You are not owner of thread

By | 05/14/2019
 

We have AWS RDS with MariaDB.

The error below and its solution aren’t specific to AWS RDS and MariaDB.

The next error appears during attempt to kill() a thread in MySQL:

MariaDB [(none)]> kill 759;
ERROR 1095 (HY000): You are not owner of thread 759

The solution is to use the mysql.rds_kill() procedure instead:

MariaDB [(none)]> SHOW CREATE PROCEDURE mysql.rds_kill\G
*************************** 1. row ***************************
Procedure: rds_kill
sql_mode: NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
Create Procedure: CREATE DEFINER=`rdsadmin`@`localhost` PROCEDURE `rds_kill`(IN thread BIGINT)
READS SQL DATA
DETERMINISTIC
BEGIN
DECLARE l_user varchar(16);
DECLARE l_host varchar(64);
DECLARE foo varchar(255);
SELECT user, host INTO l_user, l_host
FROM information_schema.processlist
WHERE id = thread;
IF l_user = "rdsadmin" and l_host like "localhost%" THEN
select `ERROR (RDS): CANNOT KILL RDSADMIN SESSION` into foo;
ELSEIF l_user = "rdsrepladmin" THEN
select `ERROR (RDS): CANNOT KILL RDSREPLADMIN SESSION` into foo;
ELSE
KILL thread;
END IF;
END

Execute it:

MariaDB [(none)]> CALL mysql.rds_kill(761);
Query OK, 0 rows affected (0.00 sec)

For Azure MySQL, there is a similar procedure mysql.az_kill().

Done.