Percona-Tookit工具包之pt-slave-restart
Preface
Sometimes,the threads(especially the SQL_Thread) will be terminated by accident.The slave will stop until we fix the relevant error or just skip them.There's many methods we can use to solve these kind of issues.For example,we can set "sql_salve_skip_counter" in mysql client and we can set "slave_skip_errors" in my.cnf as well(static parameter,need to restart mysqld).Further more,set "slave_exec_mode=idempotent" may also be useful.It can skip the "duplicate-key" or "no-key-found" errors.It means that we don't need to pay more attention to error 1062 and 1032 any more if we do so.Is there any other method can solve these skipping error issues?Surely there is one.
Introduce
pt-slave-restart is the one who can skip specific errors and restart the slave automatically.But considering of the consistency of data,we'd better do think twice when skipping errors by it.There're two test below.Let's see how the pt-slave-restart works.
Procedure
Usage
pt-slave-restart [OPTIONS] [DSN]
Common parameter
--always //Start slaves if there's no error,it will prevent to you stop slave manully.
--check-relay-log //Check the relay log file before checking errors on slave.
--error-length //Specify the max length to print.
--error-number //Specify the number of errors you want to make the slave try to restart.
--error-text //Specify the text of errors you want to make the slave try to restart.
--max-sleep //Specify the maximum sleep time after it polling the slave.
--min-sleep //Specify the minimum sleep time after it polling the slave.
--monitor //whether to monitor the slave(default)
--master-uuid //Specify the master-uuid you want to skip,if you have multiple writing node.
--recurse //If you want to execute pt-slave-restart on master.It's dispensable option.
--recurse-method //This option is used together with "--recurse".It specify the method to find slaves.
--sleep //Specify the interval of sleep time in checking the slave.
--until-master //run until this master logfile,position then exit.
--until-relay //run until this relay logfile,position then exit.
Example
1.Test of automatically restart slave.
Execute pt-slave-restart with "--always".
[root@zlm1 :: ~]
#pt-slave-restart --recurse= --always -h192.168.56. -P3306 -urepl -prepl4slave
*******************************************************************
Using the default of SSL_verify_mode of SSL_VERIFY_NONE for client
is deprecated! Please set SSL_verify_mode to SSL_VERIFY_PEER
together with SSL_ca_file|SSL_ca_path for verification.
If you really don't want to verify the certificate and keep the
connection open to Man-In-The-Middle attacks please set
SSL_verify_mode explicitly to SSL_VERIFY_NONE in your application.
*******************************************************************
at /usr/bin/pt-slave-restart line .
*******************************************************************
Using the default of SSL_verify_mode of SSL_VERIFY_NONE for client
is deprecated! Please set SSL_verify_mode to SSL_VERIFY_PEER
together with SSL_ca_file|SSL_ca_path for verification.
If you really don't want to verify the certificate and keep the
connection open to Man-In-The-Middle attacks please set
SSL_verify_mode explicitly to SSL_VERIFY_NONE in your application.
*******************************************************************
at /usr/bin/pt-slave-restart line . # A software update is available:
--21T12:: P=,h=192.168.56.101,p=...,u=repl relay-bin. //It has begun to monitor the slave to automatically startup.
Check whether the slave replication is normal.
zlm@192.168.56.101: [(none)]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
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:
Last_Error:
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec)
Stop slave replication.
zlm@192.168.56.101: [(none)]>stop slave;
Query OK, rows affected (0.03 sec) zlm@192.168.56.101: [(none)]>show slave status\G
*************************** . row ***************************
Slave_IO_State:
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: No //IO_Thread has stopped.
Slave_SQL_Running: No //SQL_Thread has stopped.
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error:
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec) //Wait for a while and check it again. zlm@192.168.56.101: [(none)]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: Yes //IO_Thread has started again.
Slave_SQL_Running: Yes //SQL_Thread has started again.
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error:
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec)
The output is added one line which shows the connection status of slave on master.
# A software update is available:
--21T12:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
--21T12:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
Check the general log of slave to see the details.
[root@zlm2 :: /data/mysql/mysql3306/data]
#tail -f zlm2.log
mysqld, Version: 5.7.-log (MySQL Community Server (GPL)). started with:
Tcp port: Unix socket: /var/lib/mysql/mysql.sock
Time Id Command Argument
--21T10::.049221Z Query stop slave
--21T10::.598248Z Query show slave status
--21T10::.080665Z Query SHOW SLAVE STATUS
--21T10::.081848Z Query START SLAVE
--21T10::.084221Z Connect Out repl@192.168.56.100:
--21T10::.086327Z Query SHOW SLAVE STATUS
--21T10::.570310Z Quit
--21T10::.782934Z Connect zlm@zlm2 on using TCP/IP
--21T10::.784208Z Query select @@version_comment limit
--21T10::.785102Z Query select USER()
--21T10::.440909Z Query show slave status
--21T10::.535233Z Query show slave status
--21T10::.087271Z Query SHOW SLAVE STATUS
...
2.Test of skipping error of replication.
Do some operations on master.
zlm@192.168.56.100: [zlm]>show tables;
+---------------+
| Tables_in_zlm |
+---------------+
| test_gbk |
| test_utf8 |
| test_utf8mb4 |
+---------------+
rows in set (0.00 sec) zlm@192.168.56.100: [zlm]>drop table test_gbk,test_utf8,test_utf8mb4;
Query OK, rows affected (0.04 sec) zlm@192.168.56.100: [zlm]>show tables;
Empty set (0.00 sec) zlm@192.168.56.100: [zlm]>create table test(
-> id int,
-> name varchar()
-> ) engine=innodb;
Query OK, rows affected (0.03 sec) zlm@192.168.56.100: [zlm]>alter table test add primary key(id);
Query OK, rows affected (0.01 sec)
Records: Duplicates: Warnings: zlm@192.168.56.100: [zlm]>alter table test modify column id int unsigned not null auto_increment;
Query OK, rows affected (0.02 sec)
Records: Duplicates: Warnings: zlm@192.168.56.100: [zlm]>show create table test\G
*************************** . row ***************************
Table: test
Create Table: CREATE TABLE `test` (
`id` int() unsigned NOT NULL AUTO_INCREMENT,
`name` varchar() DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT= DEFAULT CHARSET=utf8
row in set (0.00 sec) zlm@192.168.56.100: [zlm]>insert into test values(,'zlm');
Query OK, row affected (0.00 sec) zlm@192.168.56.100: [zlm]>select * from test;
+----+------+
| id | name |
+----+------+
| | zlm |
+----+------+
row in set (0.00 sec)
Check the slave status on slave.
zlm@192.168.56.101: [zlm]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error: Error 'Unknown table 'zlm.test_gbk,zlm.test_utf8,zlm.test_utf8mb4'' on query. Default database: 'zlm'. Query: 'DROP TABLE `test_gbk`,`test_utf8`,`test_utf8mb4` /* generated by server */'
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error: Error 'Unknown table 'zlm.test_gbk,zlm.test_utf8,zlm.test_utf8mb4'' on query. Default database: 'zlm'. Query: 'DROP TABLE `test_gbk`,`test_utf8`,`test_utf8mb4` /* generated by server */'
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: ::
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec) zlm@192.168.56.101: [zlm]>show tables;
+----------------+
| Tables_in_zlm |
+----------------+
| semi_sync_test |
| t1 |
| t2 |
| t3 |
| test |
| test_flashbk |
+----------------+
rows in set (0.00 sec) //There're no target tables at all.So error 1051 occurs.
Try to skip the error 1051 on master.
[root@zlm1 :: ~]
#pt-slave-restart --recurse= --error-number= -h192.168.56. -P3306 -urepl -prepl4slave
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
Error is not in --error-numbers. //error 1050 occurs then.
Check replicaiton slave status again.
zlm@192.168.56.101: [zlm]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error: Error 'Table 'test' already exists' on query. Default database: 'zlm'. Query: 'create table test(
id int,
name varchar()
) engine=innodb'
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error: Error 'Table 'test' already exists' on query. Default database: 'zlm'. Query: 'create table test(
id int,
name varchar()
) engine=innodb'
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: ::
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec)
Continue to skip error 1050 on master.
[root@zlm1 :: ~]
#pt-slave-restart --recurse= --error-number= -h192.168.56. -P3306 -urepl -prepl4slave
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
Error is not in --error-numbers.
Check the slave status one more time.
zlm@192.168.56.101: [zlm]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error: Error 'Multiple primary key defined' on query. Default database: 'zlm'. Query: 'alter table test add primary key(id)'
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error: Error 'Multiple primary key defined' on query. Default database: 'zlm'. Query: 'alter table test add primary key(id)'
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: ::
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec) zlm@192.168.56.101: [zlm]>show create table test\G
*************************** . row ***************************
Table: test
Create Table: CREATE TABLE `test` (
`id` bigint() NOT NULL AUTO_INCREMENT,
`name` varchar() NOT NULL DEFAULT '',
PRIMARY KEY (`id`) //The table "test" had been added primary key what hit the error.
) ENGINE=InnoDB AUTO_INCREMENT= DEFAULT CHARSET=utf8mb4
row in set (0.00 sec)
Continue to skip error 1068 on master.
[root@zlm1 :: ~]
#pt-slave-restart --recurse= --error-number= -h192.168.56. -P3306 -urepl -prepl4slave
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin.
Error is not in --error-numbers.
Check the slave status the fourth times.
zlm@192.168.56.101: [zlm]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error: Column of table 'zlm.test' cannot be converted from type 'varchar(30(bytes))' to type 'varchar(80(bytes) utf8mb4)'
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error: Column of table 'zlm.test' cannot be converted from type 'varchar(30(bytes))' to type 'varchar(80(bytes) utf8mb4)'
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp: ::
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.00 sec) //Table "test" on master is utf8 menas its column varchar(10) contain 30 bytes
//Table "test" on slave is utf8mb4 means its column varchar(20) contain 80 bytes.
//They cannot be converted.Thus the error 1677 occurs.
Continue to skip error 1677 on master.
[root@zlm1 :: ~]
#pt-slave-restart --recurse= --error-number= -h192.168.56. -P3306 -urepl -prepl4slave
--21T13:: P=,h=192.168.56.101,p=...,u=repl relay-bin. //No more error appears anymore.
Check the slave status the fifth times.
zlm@192.168.56.101: [zlm]>show slave status\G
*************************** . row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.56.100
Master_User: repl
Master_Port:
Connect_Retry:
Master_Log_File: mysql-bin.
Read_Master_Log_Pos:
Relay_Log_File: relay-bin.
Relay_Log_Pos:
Relay_Master_Log_File: mysql-bin.
Slave_IO_Running: Yes
Slave_SQL_Running: Yes //The SQL_Thread is normal now.No errors found.
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:
Last_Error:
Skip_Counter:
Exec_Master_Log_Pos:
Relay_Log_Space:
Until_Condition: None
Until_Log_File:
Until_Log_Pos:
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno:
Last_IO_Error:
Last_SQL_Errno:
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id:
Master_UUID: 2a4b3562-2ab6-11e8-be7a-080027de0e0e
Master_Info_File: /data/mysql/mysql3306/data/master.info
SQL_Delay:
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count:
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Executed_Gtid_Set: 27af30ca--11e8-ad7e-080027de0e0e:,
2a4b3562-2ab6-11e8-be7a-080027de0e0e:-
Auto_Position:
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
row in set (0.01 sec) //Util now,we've skipped all the errors dynamically.But it doesn't guarantee the consistency of table "test" at all.
See what will happen on test of slave.
zlm@192.168.56.101: [zlm]>show create table test\G
*************************** . row ***************************
Table: test
Create Table: CREATE TABLE `test` (
`id` int() unsigned NOT NULL AUTO_INCREMENT,
`name` varchar() NOT NULL DEFAULT '',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT= DEFAULT CHARSET=utf8mb4
row in set (0.00 sec) zlm@192.168.56.101: [zlm]>select count(*) from test;
+----------+
| count(*) |
+----------+
| |
+----------+
row in set (0.02 sec) //No change happened.
Summary
- pt-slave-restart is tool use to avoid slave replication terminated accidentally due to different errors.
- On account of "skip-slave-errors" is a static parameter,pt-slave-restart is more convenient to skip errors dynamically.
- Unless you know the influence or consequences of the skipping operation.Don't skip any errors automatically.It's not safe to keep data consistency.
- It's not recommended to use parameter "--aways",factitiously check and restart is more reliable.
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