mysql复制卡住

q1qsirdb  于 2021-06-20  发布在  Mysql
关注(0)|答案(1)|浏览(381)

我设置了从主服务器到从服务器的mysql复制。”show slave status\g“显示从机状态\g”显示的秒数比主机持续增加。下面是从最旧（顶部）到最新（底部）的三个连续结果。有人知道怎么回事吗？。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
1

mysql> SHOW SLAVE STATUS\G

***************************1. row***************************

               Slave_IO_State: Queueing master event to the relay log
                  Master_Host: <excluding>
                  Master_User: <excluding>
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.002723
          Read_Master_Log_Pos: 893947806
               Relay_Log_File: design-hotels-database-relay-bin.000002
                Relay_Log_Pos: 7692403
        Relay_Master_Log_File: mysql-bin.002723
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: starwood_sop,starwood_blp
           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: 192464416
              Relay_Log_Space: 709176017
              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: 76613
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
                  Master_UUID:
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Reading event from the relay log
           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:
1 row in set (0.04 sec)

2

mysql> SHOW SLAVE STATUS\G

***************************1. row***************************

               Slave_IO_State: Queueing master event to the relay log
                  Master_Host: <excluding>
                  Master_User: <excluding>
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.002723
          Read_Master_Log_Pos: 908310158
               Relay_Log_File: design-hotels-database-relay-bin.000002
                Relay_Log_Pos: 7906291
        Relay_Master_Log_File: mysql-bin.002723
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: starwood_sop,starwood_blp
           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: 192678304
              Relay_Log_Space: 723538369
              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: 76698
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
                  Master_UUID:
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Reading event from the relay log
           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:
1 row in set (0.06 sec)

三

mysql> SHOW SLAVE STATUS\G

***************************1. row***************************

               Slave_IO_State: Queueing master event to the relay log
                  Master_Host: <excluding>
                  Master_User: <excluding>
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.002723
          Read_Master_Log_Pos: 945765663
               Relay_Log_File: design-hotels-database-relay-bin.000002
                Relay_Log_Pos: 8389913
        Relay_Master_Log_File: mysql-bin.002723
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB: starwood_sop,starwood_blp
           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: 193161926
              Relay_Log_Space: 760993874
              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: 76870
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
                  Master_UUID:
             Master_Info_File: /var/lib/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Reading event from the relay log
           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:
1 row in set (0.04 sec)
mysqlreplicationmaster-slavedatabase-replication

1条答案

按热度按时间
uurity8g

uurity8g1#

嗯，那个 Exec_Master_Log_Pos 也在增加，这表明sql线程实际上正在工作并应用更改。只是速度不够快，跟不上传入的日志，这表明 Read_Master_Log_Pos ```
Exec-pos Read-pos
1: 192464416 893947806
2: 192678304 (+213,888) 908310158 (+14,362,352
3: 193161926 (+483,622) 945765663 (+37,455,505)

因此，传入日志（read pos）的到达速率比复制能够在从属示例上执行更改的速率高出许多倍。
复制滞后是一个复杂的问题，其原因是多方面的。有许多配置设置可用于帮助提高从机的吞吐量。您没有描述任何有关当前配置、数据库更改的性质或正在更改的表的信息，因此我无法提供真正有根据的建议。但以下是我通常做的一些典型改变：

innodb_buffer_pool_size = # depends on server RAM and other factors
innodb_log_file_size = 1G # or more
innodb_flush_log_at_trx_commit = 2
master_info_repository = TABLE
relay_log_info_repository = TABLE
relay_log_recovery = ON
sync_master_info = 0
binlog_format = ROW # make sure all tables have PRIMARY KEY constraints

有关这些选项的详细信息，请参阅mysql文档。
即使使用了所有这些调优技巧，最终您也可能会遇到一个限制，即从线程能够在单个线程中重放在主线程的多个线程中创建的更改。
您可能可以使用多线程从机，但这并不像听起来那么简单，因此在尝试此操作之前，您需要阅读更多关于它的内容。
即使使用调优和多线程从属，也有可能达到硬件的极限。它根本无法足够快地处理这些变化。您可以将硬件升级到更快的cpu和更快的存储。
另一个选择是降低主数据库的更改率。要么在主服务器上限制更改，要么部署多个主服务器及其各自的从属服务器，并在多个主服务器上平衡更改。
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