code: private int getCurrentValuesFromCache(List<CounterUpdateCell> counterUpdateCells,
                                            ColumnFamilyStore cfs,
                                            ClockAndCount[] currentValues)
      {
          int cacheMisses = 0;
          for (int i = 0; i < counterUpdateCells.size(); i++)
          {
              ClockAndCount cached = cfs.getCachedCounter(key(), counterUpdateCells.get(i).name());
              if (cached != null)
                  currentValues[i] = cached;
              else
                  cacheMisses++;
          }
          return cacheMisses;
      }
docs: Returns the count of cache misses.