code: @Override
    protected void setFields(Properties props, StorageDirectory sd)
        throws IOException {
      props.setProperty(NAMESPACE_ID, String.valueOf(namespaceID));
      props.setProperty(CHECK_TIME, String.valueOf(cTime));
      props.setProperty(LAYOUT_VERSION, String.valueOf(layoutVersion));
    }
docs: Set layoutVersion, namespaceID and blockpoolID into namespace storage
  VERSION file