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Problem with replication
Posted by: Anatoli Marinov
Date: September 14, 2005 02:34AM

Hi,
I have a 3 mysql servers that work toghater. One of them is a master and other 2 servers are slaves and replicate all queries from master. I have a script which monitor master and if master falls I switch one of other servers to master and make "change master to new master ..." for other slave server. It works fine but when i try to return old master like a slave to new master because it have to sync data I make this:

to old master which i try to set it to slave connected to current master:
stop slave;
reset master;
reset slave;
change master to master_host='<new_master>', master_user='' .......
start slave;

and replication begins ...
after some time this slave server stop replication and all looks fine. I haven`t error in master log file or slave log file but the data in master and slave not equal (~20 000 rows missing :) from slave )

if I make same operation to other slave : stop slave; reset slave; change master .............
it sync to the end and not have any problems

my tables is:

CREATE TABLE `users` (
`id` int(10) unsigned NOT NULL auto_increment,
`cash` int(11) NOT NULL default '0',
`user` varchar(30) NOT NULL default '',
PRIMARY KEY (`id`)
)


after replication master table status is:
mysql> show table status\G
*************************** 1. row ***************************
Name: users
Engine: MyISAM
Version: 9
Row_format: Dynamic
Rows: 185662
Avg_row_length: 23
Data_length: 4446552
Max_data_length: 4294967295
Index_length: 1524736
Data_free: 0
Auto_increment: 185663
Create_time: 2005-09-14 10:33:01
Update_time: 2005-09-14 10:35:11
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options:
Comment:
1 row in set (0.00 sec)

mysql> select count(id) from users;
+-----------+
| count(id) |
+-----------+
| 185662 |
+-----------+
1 row in set (0.00 sec)


after replication slave (old_master) table status is:

mysql> show table status\G
*************************** 1. row ***************************
Name: users
Engine: MyISAM
Version: 9
Row_format: Dynamic
Rows: 163405
Avg_row_length: 23
Data_length: 3921512
Max_data_length: 4294967295
Index_length: 1342464
Data_free: 0
Auto_increment: 185663
Create_time: 2005-09-14 10:42:47
Update_time: 2005-09-14 10:45:19
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options:
Comment:
mysql> select count(id) from users;
+-----------+
| count(id) |
+-----------+
| 163405 |
+-----------+
1 row in set (0.00 sec)

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.70.82
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 22620921
Relay_Log_File: toli-relay-bin.000001
Relay_Log_Pos: 19926471
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: repl
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 22620921
Relay_Log_Space: 19926471
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
1 row in set (0.00 sec)

In this case i never join old master like slave to the replication network. Every from other nodes I can stop and return back but only old master is broken forever :)
Why it hapens?
Everibody know how I can repaire old master and join it to the replication network like a slave.

Best Regards

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