Apr8

【转载】MySQL中主从复制重复键问题修复

Author: 老汤  Click: 6307   Date: 2011.04.08 @ 09:48:26 am Category: 数据库

-------------------quote begin------------------------
3. If you decide that you can skip the next statement from the master, issue the following
statements:
mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER = n;
mysql> START SLAVE;
The value of n should be 1 if the next statement from the master does not use
AUTO_INCREMENT or LAST_INSERT_ID(). Otherwise, the value should be 2. The
reason for using a value of 2 for statements that use AUTO_INCREMENT or
LAST_INSERT_ID() is that they take two events in the binary log of the master.

-------------------quote end------------------------

MySQL文档中的意思是当master传到slave的语句中要用到auto_increment,或者last_insert_id()时,需要skip两个event. 但实际情况并非如此

测试过程如下:
172.16.161.26 为master
172.16.161.15 为slave
同步c2cdb,初始状态ok

1. 在master上创建测试表


mysql> create table tmp_test_0208(id int not null auto_increment,name varchar(30),primary key(id)) engine=innodb;
Query OK, 0 rows affected (0.20 sec)

2, 在salve上insert 3条记录


mysql> insert into tmp_test_0208 values(1,'a'),(2,'b'),(3,'c');
Query OK, 3 rows affected (0.00 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> select * from tmp_test_0208;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
+----+------+
3 rows in set (0.00 sec)

3, 在master上insert 3条记录

mysql> insert into tmp_test_0208(name) values('a'),('b'),('c');
Query OK, 3 rows affected (0.02 sec)
Records: 3 Duplicates: 0 Warnings: 0

mysql> select * from tmp_test_0208;
+----+------+
| id | name |
+----+------+
| 1 | a |
| 2 | b |
| 3 | c |
+----+------+
3 rows in set (0.00 sec)

4,  slave 的sql thread 中止


/usr/local/mysql/bin/mysql -uroot -pxxx c2cdb -s -e "show slave status\G" |egrep "Slave_IO_Running|Sl
ave_SQL_Running"
Slave_IO_Running: Yes
Slave_SQL_Running: No

5,  skip next statemate后start slave正常

mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1 ;
Query OK, 0 rows affected (0.00 sec)

mysql> slave start;
Query OK, 0 rows affected (0.00 sec)

/usr/local/mysql/bin/mysql -uroot -pxxx c2cdb -s -e "show slave status\G" |egrep "Slave_IO_Running|Sl
ave_SQL_Running"
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

slave端errlog如下:
070208 16:07:59[ERROR] Slave: Error 'Duplicate entry '1' for key 1' on query. Default database: 'c2cdb'. Query: 'insert into tmp_te
st_0208(name) values('a'),('b'),('c')', Error_code: 1062

070208 16:07:59 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE
 START". We stopped at log 'db_auction1-bin.000203' position 14215101

070208 16:09:59 [Note] Slave SQL thread initialized, starting replication in log 'db_auction1-bin.000203' at position 14215101, rela
y log './db_auction1_b-relay-bin.000457' position: 200682931

 

master羰binlog中相应的记录如下:

# at 14215101
#070208 16:08:00 server id 1  log_pos 14215101  Intvar
SET INSERT_ID=1;
# at 14215129
#070208 16:08:00 server id 1  log_pos 14215129  Query   thread_id=2744782       exec_time=0     error_code=0
SET TIMESTAMP=1170922080;
insert into tmp_test_0208(name) values('a'),('b'),('c');

总结:使用SET GLOBAL SQL_SLAVE_SKIP_COUNTER 命令跳过失败的SQL



TAG:   mysql master slave

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