I have a table of 4GB(18 Million Rows) in MYISAM Engine on one of my slave server, and I want to convert it to INNODB Engine, the server is replicating from a master. I tried to use the pt-online-schema-change tool which says that it will take more than 1 day, and server lag is increasing because there a lot of insertions in this table,so every query has to be executed twice because of the trigger that the tool creates so that no-downtime is faced.
But I can afford a downtime since it is a slave, is it advisable to just simply run the Alter Engine command ,and how much approximate time will it take to execute?
Also I fear that the replication may break,once the alteration takes place. I am replicating from a 5.5 Master and My Slave is on 5.6.
What am I advised to do in this case, Any help would be appreciated since I am very new to this field.