mysql的XA事务恢复

mysql数据库开机报错：

InnoDB: The log sequence number in ibdata files does not match

InnoDB: the log sequence number in the ib_logfiles!

100224 12:24:20 InnoDB: Database was not shut down normally!

InnoDB: Starting crash recovery.

InnoDB: Reading tablespace information from the .ibd files...

InnoDB: Restoring possible half-written data pages from the doublewrite

InnoDB: buffer...

InnoDB: Transaction 0 4497755 was in the XA prepared state.

InnoDB: Transaction 0 4468551 was in the XA prepared state.

InnoDB: Transaction 0 4468140 was in the XA prepared state.

InnoDB: 3 transaction(s) which must be rolled back or cleaned up

InnoDB: in total 0 row operations to undo

InnoDB: Trx id counter is 0 5312768

InnoDB: Starting in background the rollback of uncommitted transactions

100224 12:24:20 InnoDB: Rollback of non-prepared transactions completed

100224 12:24:20 InnoDB: Started; log sequence number 0 3805002509

100224 12:24:20 InnoDB: Starting recovery for XA transactions...

100224 12:24:20 InnoDB: Transaction 0 4497755 in prepared state after recovery

100224 12:24:20 InnoDB: Transaction contains changes to 8 rows

100224 12:24:20 InnoDB: Transaction 0 4468551 in prepared state after recovery

100224 12:24:20 InnoDB: Transaction contains changes to 1 rows

100224 12:24:20 InnoDB: Transaction 0 4468140 in prepared state after recovery

100224 12:24:20 InnoDB: Transaction contains changes to 1 rows

100224 12:24:20 InnoDB: 3 transactions in prepared state after recovery

100224 12:24:20 [Note] Found 3 prepared transaction(s) in InnoDB

100224 12:24:20 [Warning] Found 3 prepared XA transactions

100224 12:24:20 [Note] Event Scheduler: Loaded 0 events

100224 12:24:20 [Note] /opt/mysql/bin/mysqld: ready for connections.

Version: '5.1.39' socket: '/tmp/mysql.sock' port: 3306 MySQL Community Server (GPL)

意味着有三个XA的事务没有提交或回滚。

登录到mysql

mysql> xa recover;

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

| formatID | gtrid_length | bqual_length | data |

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

| 131075 | 30 | 28 | 1-7f000001:bae5:4b6928eb:f06397f000001:bae5:4b6928eb:f0650 |

| 131075 | 30 | 28 | 1-7f000001:bae5:4b6928eb:fb5c37f000001:bae5:4b6928eb:fb5cd |

| 131075 | 30 | 28 | 1-7f000001:bae5:4b6928eb:f03ea7f000001:bae5:4b6928eb:f0400 |

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

数据表示信息如下：

formatIDis the formatIDpart of the transaction xid

gtrid_lengthis the length in bytes of the gtridpart of the xid

bqual_lengthis the length in bytes of the bqualpart of the xid

datais the concatenation of the gtridand bqualparts of the xid

这是三个XA事务的信息，准备直接回滚。

mysql> xa rollback '1-7f000001:bae5:4b6928eb:fb5c3','7f000001:bae5:4b6928eb:fb5cd',131075;

Query OK, 0 rows affected (0.41 sec)

再启动就正常了。