Suddenly remembered before this year is the master-slave synchronization of database, the configuration from the parameters of the libraries actively pull, forgot to what is, notes and Internet check less than a day.

Then suddenly want to understand master-slave synchronization default from library own pull or push the main library, what say online have, then I see the website seems to be under two kinds of views have.

this website clear written from a library to pull
https://dev.mysql.com/doc/refman/5.7/en/replication-implementation.html




but the two section of the website describes the main library to send from library
https://dev.mysql.com/doc/refman/5.7/en/replication-implementation-details.html


https://dev.mysql.com/doc/refman/5.7/en/master-thread-states.html



Who can help the younger brother solution and confused... Is there anything that's parameters can be configured

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