=== db2123 (s5 codfw master): ===

mysql:root@localhost [dewiki]> alter table logging engine=InnoDB;
Query OK, 0 rows affected (8 min 47.942 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql:root@localhost [dewiki]> optimize table logging;
+----------------+----------+----------+-------------------------------------------------------------------+
| Table          | Op       | Msg_type | Msg_text                                                          |
+----------------+----------+----------+-------------------------------------------------------------------+
| dewiki.logging | optimize | note     | Table does not support optimize, doing recreate + analyze instead |
| dewiki.logging | optimize | status   | OK                                                                |
+----------------+----------+----------+-------------------------------------------------------------------+
2 rows in set (8 min 31.735 sec)

=== db2111 (s5 codfw slave - happens everywhere): === 

root@db2111:/srv/sqldata#  mysqlbinlog -vvv   db2111-relay-bin.001406 | grep "alter table"
alter table logging engine=InnoDB
root@db2111:/srv/sqldata#  mysqlbinlog -vvv   db2111-relay-bin.001406 | grep "optimize table"
root@db2111:/srv/sqldata#