/** construct a Transaction for use in an offline operation */
public static LifecycleTransaction offline(
OperationType operationType, Iterable<SSTableReader> readers) {
// if offline, for simplicity we just use a dummy tracker
Tracker dummy = new Tracker(null, false);
dummy.addInitialSSTables(readers);
dummy.apply(updateCompacting(emptySet(), readers));
return new LifecycleTransaction(dummy, operationType, readers);
}
