Question

我在Mint 18上使用MySQL 5.7.19-0ubuntu0.16.04.1。我在准备XA事务时发现，然后服务器崩溃了。服务重启后，我再也无法触摸该事务了。它仍然锁定了桌子。

的MySQL＆GT; xa开始'1';

的MySQL＆GT; xa结束'1';

mysq＆GT; xa准备'1';

sudo killall -9 mysqld

sudo service start mysqld

的MySQL＆GT; xa commit'1';

ERROR 1399（XAE07）：XAER_RMFAIL：当全局事务处于非现有状态时，无法执行命令

的MySQL＆GT; xa开始'1';

ERROR 1440（XAE08）：XAER_DUPID：XID已经存在

情况与bug71352类似，但我的版本距离很远。我错过了什么？

Answer 1

我无法重现这个问题：

mysql> \! lsb_release --description
Description:    Linux Mint 18.2 Sonya

mysql> SELECT VERSION();
+-----------+
| VERSION() |
+-----------+
| 5.7.19    |
+-----------+
1 row in set (0.00 sec)

mysql> DROP TABLE IF EXISTS `t`;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> CREATE TABLE IF NOT EXISTS `t` (
    ->   `id` INT
    -> ) ENGINE=InnoDB;
Query OK, 0 rows affected (0.00 sec)

mysql> XA START '1';
Query OK, 0 rows affected (0.00 sec)

mysql> INSERT INTO `t`
    -> VALUES (1);
Query OK, 1 row affected (0.01 sec)

mysql> XA END '1';
Query OK, 0 rows affected (0.00 sec)

mysql> XA PREPARE '1';
Query OK, 0 rows affected (0.00 sec)

mysql> XA RECOVER;
+----------+--------------+--------------+------+
| formatID | gtrid_length | bqual_length | data |
+----------+--------------+--------------+------+
|        1 |            1 |            0 | 1    |
+----------+--------------+--------------+------+
1 row in set (0.00 sec)

-- Killed mysqld from other session

mysql> \! service mysql status | grep 'Active'
   Active: inactive (dead) since 33s ago

-- Restared mysqld from other session

mysql> \! service mysql status | grep 'Active'
   Active: active (running) since 3s ago

mysql> XA RECOVER;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:
Current database:

+----------+--------------+--------------+------+
| formatID | gtrid_length | bqual_length | data |
+----------+--------------+--------------+------+
|        1 |            1 |            0 | 1    |
+----------+--------------+--------------+------+
1 row in set (0.02 sec)

mysql> SELECT `id` FROM `t`;
Empty set (0.00 sec)

mysql> XA START '1';
ERROR 1440 (XAE08): XAER_DUPID: The XID already exists

mysql> XA COMMIT '1';
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT `id` FROM `t`;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

Answer 2

xa start必须失败，这是预期的，这是挂起的XA事务。你需要先进行xa恢复。

服务器崩溃后如何提交XA事务

2 个答案: