System architecture & microservices

1、 Under Cluster , Every server The code of the node is the same .

2、 Database master-slave read-write separation .

Database master-slave read-write separation ：

Share the pressure of the database , The main database is responsible for writing , Read from the library .

After the master database writes data , The data will be synchronized to the slave Library .

Read data to do a diversion , Slave Library 1 And from the library 2.

Maintain data consistency , The master library synchronizes data to the slave library , adopt binlog File implementation .

binlog Refers to binary log , It records all the changes in the database , And stored on disk in binary form , What's synchronized is sql sentence .

How to ensure low data delay between master and slave ？

High delay , It will cause us to write the data , Look up the data , The data cannot be found . The data will be found later .

dba It is necessary to ensure the delay of master and slave .

It can be used to view the change history of the database 、 Incremental database backup and recovery 、MySQL Copy （ Replication of master-slave database ）.

binlog There are three formats ：

statement： be based on SQL Copy of sentences （statement-based replication,SBR）
row： Line based replication （row-based replication,RBR）
mixed： Hybrid mode replication （mixed-based replication,MBR）