MySQL5.7不停业务将传统复制变更为GTID复制的实例
由于GTID的优势,我们需要将传统基于file-pos的复制更改为基于GTID的复制,如何在线变更成为我们关心的一个点,如下为具体的方法:
目前我们有一个传统复制下的M-S结构:
port3301master
port3302slave
master上(3301): [zejin]3301>select*fromt_users; +----+------+ |id|name| +----+------+ |1|hao| |2|zhou| +----+------+ rowsinset(0.00sec) slave上(3302): [zejin]3302>showslavestatus\G ***************************1.row*************************** Slave_IO_State:Waitingformastertosendevent Master_Host:192.168.1.240 Master_User:repl Master_Port:3301 Connect_Retry:60 Master_Log_File:binlog57.000002 Read_Master_Log_Pos:417 Relay_Log_File:zejin240-relay-bin.000004 Relay_Log_Pos:628 Relay_Master_Log_File:binlog57.000002 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:417 Relay_Log_Space:884 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:3301 Master_UUID:a97983fc-5a29-11e6-9d28-000c29d4dc3f Master_Info_File:/home/mysql/I3302/master.info SQL_Delay:0 SQL_Remaining_Delay:NULL Slave_SQL_Running_State:Slavehasreadallrelaylog;waitingformoreupdates Master_Retry_Count:86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position:0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: rowinset(0.00sec) [zejin]3302>select*fromt_users; +----+------+ |id|name| +----+------+ |1|hao| |2|zhou| +----+------+ rowsinset(0.00sec)
如下为在线变更的具体的操作步骤:
前提:
1.要求所有的mysql版本5.7.6或更高的版本。
2.目前拓扑结构中所有的mysql的gtid_mode的值为off状态。
3.如下的操作步骤都是有序的,不要跳跃着进行。
补充一下全局系统变量GTID_MODE变量值说明:
OFF 新事务是非GTID, Slave只接受不带GTID的事务,传送来GTID的事务会报错
OFF_PERMISSIVE 新事务是非GTID, Slave即接受不带GTID的事务也接受带GTID的事务
ON_PERMISSIVE 新事务是GTID, Slave即接受不带GTID的事务也接受带GTID的事务
ON 新事务是GTID, Slave只接受带GTID的事务
需要注意的是,这几个值的改变是有顺序的,即
off<--->OFF_PERMISSIVE<--->ON_PERMISSIVE<--->ON
不能跳跃执行,会报错。
step1:在每个mysql实例上,将ENFORCE_GTID_CONSISTENCY设置为warning,哪台先执行不影响结果。
[zejin]3302>set@@global.enforce_gtid_consistency=warn; QueryOK,0rowsaffected(0.00sec) [zejin]3301>set@@global.enforce_gtid_consistency=warn; QueryOK,0rowsaffected(0.00sec)
注意:执行完这条语句后,如果出现GTID不兼容的语句用法,在错误日志会记录相关信息,那么需要调整应该程序避免不兼容的写法,直到完全没有产生不兼容的语句,可以通过应该程序去排查所有的sql,也可以设置后观察错误日志一段时间,这一步非常重要。
step2:在每个mysql实例上,设置ENFORCE_GTID_CONSISTENCY为ON,哪台先执行不影响结果
在第一步完成后,就可以将值设置为on。
[zejin]3301>set@@global.enforce_gtid_consistency=on; QueryOK,0rowsaffected(0.03sec) [zejin]3302>set@@global.enforce_gtid_consistency=on; QueryOK,0rowsaffected(0.00sec)
step3:在每个mysql实例上,设置GTID_MODE为off_permissiv;哪台先执行不影响结果
[zejin]3301>SET@@GLOBAL.GTID_MODE=OFF_PERMISSIVE; QueryOK,0rowsaffected(0.00sec) [zejin]3302>SET@@GLOBAL.GTID_MODE=OFF_PERMISSIVE; QueryOK,0rowsaffected(0.00sec)
step4:在每个mysql实例上,设置GTID_MODE为on_permissiv;;哪台先执行不影响结果
[zejin]3302>SET@@GLOBAL.GTID_MODE=on_permissive; QueryOK,0rowsaffected(0.00sec) [zejin]3301>SET@@GLOBAL.GTID_MODE=on_permissive; QueryOK,0rowsaffected(0.01sec)
step5:在每个mysql实例上检查变量ONGOING_ANONYMOUS_TRANSACTION_COUNT
[zejin]3301>SHOWSTATUSLIKE'ONGOING_ANONYMOUS_TRANSACTION_COUNT'; +-------------------------------------+-------+ |Variable_name|Value| +-------------------------------------+-------+ |Ongoing_anonymous_transaction_count|0| +-------------------------------------+-------+ rowinset(0.02sec) [zejin]3302>SHOWSTATUSLIKE'ONGOING_ANONYMOUS_TRANSACTION_COUNT'; +-------------------------------------+-------+ |Variable_name|Value| +-------------------------------------+-------+ |Ongoing_anonymous_transaction_count|0| +-------------------------------------+-------+ rowinset(0.02sec)
需要等到此变量为0
step6:确保所有的匿名事务(非GTID事务)已经被完全复制到所有的server上。
检查方法:
在master上: [zejin]3301>showmasterstatus; +-----------------+----------+--------------+------------------+-------------------+ |File|Position|Binlog_Do_DB|Binlog_Ignore_DB|Executed_Gtid_Set| +-----------------+----------+--------------+------------------+-------------------+ |binlog57.000005|154|||| +-----------------+----------+--------------+------------------+-------------------+ rowinset(0.00sec) 在slave上, [zejin]3302>showslavestatus\G ***************************1.row*************************** …… Relay_Master_Log_File:binlog57.000005 Exec_Master_Log_Pos:154 ……
检查这两项Relay_Master_Log_File的值大于binlog57.000005,
或者等于Relay_Master_Log_File等于binlog57.000005并且Exec_Master_Log_Pos的值大于等于154即可
或者slave直接用函数:
[zejin]3302>SELECTMASTER_POS_WAIT('binlog57.000005',154); +-----------------------------------------+ |MASTER_POS_WAIT('binlog57.000005',154)| +-----------------------------------------+ |0| +-----------------------------------------+ rowinset(0.00sec)
返回结果大于等于0就说明匿名事务已经全部复制完成
step7:确认整个拓扑结构中已经没有匿名事务的存在,如之前产生的所有匿名事务已经全部被执行完毕,甚至二进制日志中也不要有匿名事务,可以通过flushlogs,并让mysql来自动清理旧的二进制日志文件。
step8:在每个mysql实例上,设置GTID_MODE为on,
[zejin]3301>SET@@GLOBAL.GTID_MODE=ON; QueryOK,0rowsaffected(0.04sec) [zejin]3302>SET@@GLOBAL.GTID_MODE=ON; QueryOK,0rowsaffected(0.04sec)
step9:在每个mysql实例的配置文件my.cnf上,增加gtid-mode=ON
验证:
[zejin]3301>insertintot_usersvalues(3,'chen'); QueryOK,1rowaffected(0.02sec) [zejin]3301>updatet_userssetname='li'whereid=1; QueryOK,1rowaffected(0.03sec) Rowsmatched:1Changed:1Warnings:0 [zejin]3301>select*fromt_users; +----+------+ |id|name| +----+------+ |1|li| |2|zhou| |3|chen| +----+------+ rowsinset(0.00sec) [zejin]3302>showslavestatus\G ***************************1.row*************************** Slave_IO_State:Waitingformastertosendevent Master_Host:192.168.1.240 Master_User:repl Master_Port:3301 Connect_Retry:60 Master_Log_File:binlog57.000006 Read_Master_Log_Pos:462 Relay_Log_File:zejin240-relay-bin.000012 Relay_Log_Pos:673 Relay_Master_Log_File:binlog57.000006 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:462 Relay_Log_Space:969 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:3301 Master_UUID:a97983fc-5a29-11e6-9d28-000c29d4dc3f Master_Info_File:/home/mysql/I3302/master.info SQL_Delay:0 SQL_Remaining_Delay:NULL Slave_SQL_Running_State:Slavehasreadallrelaylog;waitingformoreupdates Master_Retry_Count:86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set:a97983fc-5a29-11e6-9d28-000c29d4dc3f:1-2 Executed_Gtid_Set:a97983fc-5a29-11e6-9d28-000c29d4dc3f:1-2 Auto_Position:0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: rowinset(0.00sec)
至此完成从传统复制到GTID复制的在线转换。
以上这篇MySQL5.7不停业务将传统复制变更为GTID复制的实例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持毛票票。