code: protected boolean addMiss(String key, byte[] bs) {
  		Miss miss = missMap.get(key);
  		if(miss==null) {
  			synchronized(missMap) {
  				missMap.put(key, new Miss(bs,clean==null?MIN_INTERVAL:clean.timeInterval));
  			}
  			return true;
  		}
  		return miss.add(bs); 
  	}
docs: Add miss to missMap.  If Miss exists, or too many tries, returns false.
  
  otherwise, returns true to allow another attempt.
  
  @param key
  @param bs
  @return