code: @VisibleForTesting
  	void memcacheSafeDelete(final String counterName)
  	{
  		Preconditions.checkNotNull(counterName);
  		try
  		{
  			memcacheService.delete(counterName);
  		}
  		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.
  		}
  	}
docs: Attempt to delete a counter from memcache but swallow any exceptions from memcache if it's down.
  
  @param counterName