Description:
I create a Falcon table with a BLOB or TEXT column.
I insert two rows.
I crash the system.
I restart the system.
I look at the rows.
One of the rows has lost its original data.
The behaviour is only repeatable if I cause a
crash. "mysqladmin shutdown" causes no problem.
"kill -9" causes no problem.
In order to cause a crash, I used both
Comparison with 0xfffd (Bug#32394), and
Backup Database (Bug#35229).
Since these crash methods are unrelated, I'm
sure that any crash method would cause the loss.
So if Bug#32394 and Bug#35229 are fixed by the
time you read this, just use another crash method.
I have tested this with mysql-6.0 and mysql-6.0-falcon
and mysql-6.0-falcon-team, pulled today.
So I regard the "patch queued" bug#33492 as unrelated.
How to repeat:
create table t (s1 text) engine=falcon;
insert into t values ('b');
insert into t values ('b');
backup database test to '1'; /* crashes */
... /* restart server, restart client */
select * from t; /* gives wrong answer */
OR
create table t (s1 blob) engine=falcon;
insert into t values ('b');
insert into t values ('b');
create table utf32 (s1 varchar(5) character set utf32);
insert into utf32 values (0xfffd);
select * from utf32 where s1 = 0xfffd; /* crashes */
... /* restart server, restart client */
select * from t; /* gives wrong answer */
Example run:
linux:/home/pgulutzan/mysql-6.0-falcon-team # /usr/local/mysql/bin/mysql --user=root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 6.0.5-alpha-debug Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use test
Database changed
mysql> create table t (s1 text) engine=falcon;
Query OK, 0 rows affected (0.08 sec)
mysql> insert into t values ('b');
Query OK, 1 row affected (0.00 sec)
mysql> insert into t values ('b');
Query OK, 1 row affected (0.00 sec)
mysql> backup database test to '1';
ERROR 2013 (HY000): Lost connection to MySQL server during query
mysql> select * from t;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 1
Current database: test
+------+
| s1 |
+------+
| b |
| |
+------+
2 rows in set (0.03 sec)
