code: @VisibleForTesting
  	BigInteger memcacheSafeGet(final String memcacheKey)
  	{
  		Preconditions.checkNotNull(memcacheKey);
  
  		BigInteger cachedCounterCount;
  		try
  		{
  			cachedCounterCount = (BigInteger) memcacheService.get(memcacheKey);
  		}
  		catch (MemcacheServiceException mse)
  		{
  			// Do nothing. This merely indicates that memcache was unreachable, which is fine. If it's
  			// unreachable, there's likely nothing in the cache anyway, but in any case there's nothing we can do here.
  			cachedCounterCount = null;
  		}
  		return cachedCounterCount;
  	}
docs: Attempt to delete a counter from memcache but swallow any exceptions from memcache if it's down.
  
  @param memcacheKey