code: public static String getMetadataSegmentName(int containerId) {
          Preconditions.checkArgument(containerId >= 0, "containerId must be a non-negative number.");
          return String.format(METADATA_SEGMENT_NAME_FORMAT, containerId);
      }
docs: Gets the name of the Segment that is used to store the Container's Segment Metadata. There is one such Segment
  per container.
  
  @param containerId The Id of the Container.
  @return The Metadata Segment name.