2015-12-22 10:00 GMT-02:00 Federico Razzoli <federico_raz@yahoo.it>:

Sounds like a bug. But, bug or not bug, I suggest you set sql_mode = 'NO_ENGINE_SUBSTITUTION'. Changes to non-InnoDB tables are NOT replicated. (There seems to be a sort of support for MyISAM, but it's unreliable and needs to be manually enabled on all nodes)

Federico

--------------------------------------------
Mar 22/12/15, Michele Tota <michele.tota@lnf.infn.it> ha scritto:

Oggetto: Re: [Maria-discuss] enforce_storage_engine galera cluster
A: maria-discuss@lists.launchpad.net
Data: Martedì 22 dicembre 2015, 12:22

Thanks guys,

as Ian has pointed out, in recent releases sql_mode
contains by
default NO_ENGINE_SUBSTITUTION so in our deployment we
set sql_mode
to blank to gracefully use InnoDB when MyISAM table
creation is
issued.

To be clearer on the problem we're experiencing,
I'll paste some
console output.

On the first node we have:

MariaDB [galera_test]> SHOW VARIABLES WHERE
Variable_name='enforce_storage_engine' OR
Variable_name='sql_mode';

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

| Variable_name          | Value
|

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

| enforce_storage_engine | InnoDB |

| sql_mode
|        |

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

2 rows in set (0.00 sec)

MariaDB [galera_test]> CREATE TABLE
table_1(id INTEGER)
ENGINE=InnoDB;

Query OK, 0 rows affected (0.01
sec)

MariaDB [galera_test]> CREATE TABLE
table_2(id INTEGER)
ENGINE=MyISAM;

Query OK, 0 rows affected, 1 warning (0.00
sec)

MariaDB [galera_test]> SHOW WARNINGS;

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

| Level | Code |
Message
|

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

| Note | 1266 | Using storage engine InnoDB for
table 'table_2' |

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

1 row in set (0.00 sec)

MariaDB [galera_test]> SELECT TABLE_NAME,
ENGINE FROM
information_schema.TABLES where TABLE_SCHEMA =
'galera_test';

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

| TABLE_NAME | ENGINE |

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

| table_1    | InnoDB |

| table_2    | InnoDB |

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

2 rows in set (0.00 sec)

Please note that in table_2 creation we obtain a
warning (not
an error), and table_2 is correctly created using
InnoDB, and until
this point, everything is working great.

When we check the same table on another cluster node, we
have:

MariaDB [galera_test]> SHOW VARIABLES WHERE
Variable_name='enforce_storage_engine' OR
Variable_name='sql_mode';

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

| Variable_name          | Value |

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

| enforce_storage_engine | InnoDB |

| sql_mode               |
|

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

2 rows in set (0.00 sec)

MariaDB [galera_test]> SELECT TABLE_NAME, ENGINE
FROM
information_schema.TABLES where TABLE_SCHEMA =
'galera_test';

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

| TABLE_NAME | ENGINE |

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

| table_1    | InnoDB |

| table_2    | MyISAM |

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

2 rows in set (0.00 sec)

MariaDB [galera_test]> SHOW TABLE STATUS WHERE
Name =
'table_2';

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

| Name    | Engine | Version | Row_format |
Rows |
Avg_row_length | Data_length | Max_data_length |
Index_length |
Data_free | Auto_increment |
Create_time         |
Update_time         | Check_time |
Collation         | Checksum |
Create_options | Comment |

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

| table_2 | MyISAM |      10 |
Fixed      |    0
|              0 |           0
| 1970324836974591 |         1024
|         0 |           NULL |
2015-12-22 11:08:34 | 2015-12-22
11:08:34 | NULL       | latin1_swedish_ci
|     NULL
|                |
|

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

1 row in set (0.00 sec)

As you can note, creating a MyISAM table (table_2) on
the first node
produces a correct InnoDB table, but replication of the
same table
on the other cluster nodes happens using MyISAM engine.

It seems like engine enforcing is used during creation
but not
during replication....

On 21/12/2015 20:34,
Ian Gilfillan
wrote:

On 21/12/2015 20:10,
Nirbhay Choubey
wrote:

On Mon,
Dec 21, 2015 at 12:47 PM,
Michele Tota <michele.tota@lnf.infn.it>
wrote:

Hello Nirbhay,

thanks for your reply. We have the 10.1.9
mariadb
version; the bug that your refers is
similar but in
our case the enforcing works properly on
the node used
for the initial write, while replicated
writes on
other nodes generate tables using another
engine.

I tried the following on 10.1.9 :

Version: Server version:
10.1.9-MariaDB-debug-log
Source distribution

Node 1:
MariaDB [test]> SET
@@enforce_storage_engine=INNODB;
Query OK, 0 rows affected (0.01
sec)

MariaDB [test]> CREATE TABLE t1(i
INT)
ENGINE=INNODB;
Query OK, 0 rows affected (0.07
sec)

MariaDB [test]> CREATE TABLE t2(i
INT)
ENGINE=MYISAM;
ERROR 1286 (42000): Unknown storage
engine 'MyISAM'

Node 2:

MariaDB [test]> SHOW TABLES;
+----------------+
| Tables_in_test |
+----------------+
| t1 |
+----------------+
1 row in set (0.00 sec)

Do you get different results? Or
your's is a
different scenario altogether?

Best,
Nirbhay

From the sounds of it, the sql_mode option
NO_ENGINE_SUBSTITUTION
is set differently in Nirbhay and Michele's
scenarios, so the
MyISAM table is converted to InnoDB with a warning in
one, and
fails in the other.

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