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3 nodes Master-Master Mysql replication not sync properly
Posted by: Mr Linux
Date: February 27, 2018 08:19PM

I have website that run on 1 haproxy server with roundrobin method that distribute multiple connections between 3 dedicated Centos servers that running as webserver/php and Master-Master Mysql replication

The website is php web script that you can register, login , update , add posts . The problem is i get different data between all 3 servers because and the only way to do it is to backup and delete all tables in database then restore the backup again , I am not an expert in SQL to fix it without dropping and restore the database

I want to know what exactly happen that makes the data become different after 3 or 4 days of last restore for database backup

I have phpMyAdmin and i noticed that tables rows sum count is different between all databases

Node1
https://s14.postimg.org/6mixjhpwt/0ydq_C.png

Node2
https://s14.postimg.org/w5b9wi1r1/0_Lk2_Y.png

Node3
https://s14.postimg.org/bxxu47jp9/pq8p_N.png

Node01 my.cnf configuration

[mysqld]
# REPLICATION #
skip-name-resolve
server-id=1
log-bin=/var/log/mysql/mysql-bin.log
relay-log=/var/log/mysql/relay-bin.log
binlog_do_db = database_ooo
binlog-format=MIXED
log-slave-updates
slave_net_timeout = 60
slave-skip-errors=1062,1032
sync_binlog = 1
sync-relay-log = 1
sync-relay-log-info = 1
sync-master-info = 1
expire_logs_days=1
auto_increment_increment = 3
auto_increment_offset = 1

# GENERAL #
default-storage-engine=MyISAM
innodb_file_per_table=1
max-allowed-packet = 16M
max-connect-errors = 1000000
key-buffer-size = 22G

# CACHES AND LIMITS #
tmp-table-size = 32M
max-heap-table-size = 32M
query-cache-type = 0
query-cache-size = 0
max-connections = 500
thread-cache-size = 50
open-files-limit = 65535
table-definition-cache = 4096
table-open-cache = 10240

# LOGGING #
log-error = /var/lib/mysql/mysql-error.log
log-queries-not-using-indexes = 1
slow-query-log = 1
slow-query-log-file = /var/lib/mysql/mysql-slow.log

SHOW SLAVE STATUS \G

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3722492
Server version: 5.5.58-cll MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SHOW SLAVE STATUS \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.0.0.3
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 1006041939
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 18205945
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
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: 1006041939
Relay_Log_Space: 18206095
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
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 3
1 row in set (0.00 sec)

mysql>

Node02 my.cnf configuration


[mysqld]
# REPLICATION #
skip-name-resolve
server-id=2
log-bin=/var/log/mysql/mysql-bin.log
relay-log=/var/log/mysql/relay-bin.log
binlog_do_db = database_ooo
binlog-format=MIXED
log-slave-updates
slave_net_timeout = 60
slave-skip-errors=1062,1032
sync_binlog = 1
sync-relay-log = 1
sync-relay-log-info = 1
sync-master-info = 1
expire_logs_days=1
auto_increment_increment = 3
auto_increment_offset = 2

# GENERAL #
default-storage-engine=MyISAM
innodb_file_per_table=1
max-allowed-packet = 16M
max-connect-errors = 1000000
key-buffer-size = 22G

# CACHES AND LIMITS #
tmp-table-size = 32M
max-heap-table-size = 32M
query-cache-type = 0
query-cache-size = 0
max-connections = 500
thread-cache-size = 50
open-files-limit = 65535
table-definition-cache = 4096
table-open-cache = 10240

# LOGGING #
log-error = /var/lib/mysql/mysql-error.log
log-queries-not-using-indexes = 1
slow-query-log = 1
slow-query-log-file = /var/lib/mysql/mysql-slow.log
max_allowed_packet=268435456
open_files_limit=2048

SHOW SLAVE STATUS \G


Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3148494
Server version: 5.5.58-cll MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SHOW SLAVE STATUS \G
*************************** 1. row ***************************
Slave_IO_State: Queueing master event to the relay log
Master_Host: 10.0.0.1
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 998311588
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 992821343
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
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: 998311588
Relay_Log_Space: 992821493
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
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
1 row in set (0.00 sec)

mysql>

Node03 my.cnf configuration


[mysqld]
# REPLICATION #
skip-name-resolve
server-id=3
log-bin=/var/log/mysql/mysql-bin.log
relay-log=/var/log/mysql/relay-bin.log
binlog_do_db = database_ooo
binlog-format=MIXED
log-slave-updates
slave_net_timeout = 60
slave-skip-errors=1062,1032
sync_binlog = 1
sync-relay-log = 1
sync-relay-log-info = 1
sync-master-info = 1
expire_logs_days=1
auto_increment_increment = 3
auto_increment_offset = 3

# GENERAL #
default-storage-engine=MyISAM
innodb_file_per_table=1
max-allowed-packet = 16M
max-connect-errors = 1000000
key-buffer-size = 22G

# CACHES AND LIMITS #
tmp-table-size = 32M
max-heap-table-size = 32M
query-cache-type = 0
query-cache-size = 0
max-connections = 500
thread-cache-size = 50
open-files-limit = 65535
table-definition-cache = 4096
table-open-cache = 10240

# LOGGING #
log-error = /var/lib/mysql/mysql-error.log
log-queries-not-using-indexes = 1
slow-query-log = 1
slow-query-log-file = /var/lib/mysql/mysql-slow.log

SHOW SLAVE STATUS \G

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3727805
Server version: 5.5.58-cll MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> SHOW SLAVE STATUS \G
*************************** 1. row ***************************
Slave_IO_State: Queueing master event to the relay log
Master_Host: 10.0.0.2
Master_User: replicator
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 1004908903
Relay_Log_File: relay-bin.000002
Relay_Log_Pos: 1000026851
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
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: 1004908301
Relay_Log_Space: 1000027603
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: 1
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 2
1 row in set (0.02 sec)

mysql>

The question is I want to find the root that cause this problem and fix it , i don't want to fix the current tables differences because i know it will be hard for me as i have no experience in SQL at all . but i can backup and restore it again and all rows will be equal in all 3 databases , but how can i prevent this problem happen again after restoring the database ?

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3 nodes Master-Master Mysql replication not sync properly
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February 27, 2018 08:19PM


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