How do convert a 66,862,521 row table from MyISAM to InnoDB without going offline for several hours?
Create a Master-Master setup as follows:


Create second master, MasterB
MasterB acts as slave to logTable
Create logTable_new as innodb
Run INSERT INTO logTable_new SELECT * FROM logTable (psuedocode) on MasterB, which sends the replication over to MasterA
When logTable_new on MasterA finishes syncing, swap out the tables