coniguring databse as master and slave

Posted on May 28, 2020

While performing mysql replication i am observing below issue:

Pre requistes : I have three mysql databases all located on different machines. Lets suppose we have db1,db2,db3 and each of them have one table languages db1 is the master of db2 db2 is the slave of db1 and master of db3 db3 is the slave of db2

Scenario 1 while inserting something in language table of db1 changes are reflected to db2 in language tables but it doesnot propagate to db3 language table.

Expectation - since db3 is the slave of db2 then above change should reflect in db3 as well but its not happening

Scenario 2 but while inserting something in language table of db2 changes are reflected in language table of db3 perfectly.

I dont know whats the gap while inserting into db1

Please suggest if any configuration needs to be done

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Andrew Moore

May 28, 2020

Hey @messielectra

You’re likely running with the log_slave_updates configuration variable disabled. With replication between db1 and db2; the events that are replicated to db2 are not logged in the replication logs (binary logs). Having log_slave_updates enabled on db2 the events are logged to the binary log and will be consumed by db3.

HTH

Andrew