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2025-01-26 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Write it on the front:
We all know that Master is full of a binlog, or Master manually executes flush logs. SLave can continue to receive data from Master for synchronization without doing anything. I don't know if my friends have considered it. Why is this?
The reason is:
In fact, executing stop slave means closing the I/O thread (stop slave IO_THREAD) and SQL thread (stop slave SQL_THREAD) respectively. The I/O thread will maintain the update of master.info information, and the SQL thread will maintain the update of relay-log.info information. When executing start slave, I/O thread and SQL thread will continue to execute according to master.info and relay-log.info information, so replication can continue.
Here's a demonstration:
Execute on Master host:
mysql> show master status\G;
*************************** 1. row ***************************
File: mysql-bin.000008
Position: 120
Executed on Slave host
cat /home/data/mysql3306/master.info
mysql-bin.000008
120
192.168.32.3
Now manually scroll through the binlog log once in Master
mysql> flush logs;
mysql> show master status\G;
*************************** 1. row ***************************
File: mysql-bin.000009
Position: 120
Executed on Slave host
cat /home/data/mysql3306/master.info
23
mysql-bin.000009
120
192.168.32.3
As you can see, the Slave host copies Master's data exactly according to the master.info file.
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