Comment 1 for bug 589512

Please confirm in real!
log_slow_slave_statements is global dynamic variable already!

mysql> show variables like 'log_slow_slave_statements';
+---------------------------+-------+
| Variable_name | Value |
+---------------------------+-------+
| log_slow_slave_statements | OFF |
+---------------------------+-------+
1 row in set (0.00 sec)

mysql> set global log_slow_slave_statements=ON;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'log_slow_slave_statements';
+---------------------------+-------+
| Variable_name | Value |
+---------------------------+-------+
| log_slow_slave_statements | ON |
+---------------------------+-------+
1 row in set (0.00 sec)