Logging of prepared statements

Hi,

Product: percona-xtradb-cluster-server-5.6 5.6.26-25.12-1.jessie

While debugging i found the following in the logfile while executing a prepared statement:

mysql> SET @s = 'SELECT SLEEP(5);';
Query OK, 0 rows affected (0.00 sec)

mysql> PREPARE stmt3 FROM @s;
Query OK, 0 rows affected (0.00 sec)
Statement prepared

mysql> EXECUTE stmt3;
+----------+
| SLEEP(5) |
+----------+
| 0 |
+----------+
1 row in set (5.00 sec)

mysql> 

This gets printed in the logfile:

151204 10:58:45 2 Query SET @s = 'SELECT SLEEP(5);'
151204 10:58:47 2 Query PREPARE stmt3 FROM @s
2 Prepare SELECT SLEEP(5)
151204 10:58:53 2 Query EXECUTE stmt3
2 Execute SELECT SLEEP(5)
151204 10:58:58 2 Execute SELECT SLEEP(5)

-> “Execute SELECT SLEEP(5)” is printed twice

Here is the output from the logfile of a mysql-server without galera:

151204 14:02:02 187871 Query SET @s = 'SELECT SLEEP(5);'
151204 14:02:07 187871 Query PREPARE stmt3 FROM @s
187871 Prepare SELECT SLEEP(5)
151204 14:02:10 187871 Query EXECUTE stmt3
151204 14:02:15 187871 Execute SELECT SLEEP(5)

-> “Execute SELECT SLEEP(5)” is printed only once

Is this a “feature” from the logging engine or is it really executed twice?

Greetings
Carsten