UUID ver2 = m2.getVersion();
assert DatabaseDescriptor.getDefsVersion().equals(ver2);
// drop it.
Migration m3 = new DropColumnFamily("Keyspace1", "MigrationCf_2");
m3.apply();
UUID ver3 = m3.getVersion();
assert DatabaseDescriptor.getDefsVersion().equals(ver3);
// now lets load the older migrations to see if that code works.
Collection<IColumn> serializedMigrations = Migration.getLocalMigrations(ver1, ver3);