public boolean isKnown(LogRecord log_record)
	{
		int rid = log_record.getCreatorId();
		MultipartTimestamp ts = log_record.getTs();

		for (MultipartTimestamp rep_ts : this.ts_table)
		{
			if (rep_ts.getComponentByReplica(rid) < ts.getComponentByReplica(rid))
				return false;
		}

		return true;
	}