public synchronized ImmutableList<RegionInfo>
    getRegionsFromMeta(TreeMap<String, HbckRegionInfo> regionInfoMap) {
    // lazy loaded, synchronized to ensure a single load
    if (regionsFromMeta == null) {
      List<RegionInfo> regions = new ArrayList<>();
      for (HbckRegionInfo h : regionInfoMap.values()) {
        if (tableName.equals(h.getTableName())) {
          if (h.getMetaEntry() != null) {
            regions.add(h.getMetaEntry().getRegionInfo());
          }
        }
      }
      regionsFromMeta = Ordering.from(RegionInfo.COMPARATOR).immutableSortedCopy(regions);
    }

    return regionsFromMeta;
  }
Returns descriptor common to all regions. null if are none or multiple!
hbase-server/src/main/java/org/apache/hadoop/hbase/util/HbckTableInfo.java