@Override
    public void handleHoleInRegionChain(byte[] holeStart, byte[] holeStop) throws IOException {
      errors.reportError(HbckErrorReporter.ERROR_CODE.HOLE_IN_REGION_CHAIN,
        "There is a hole in the region chain between " + Bytes.toStringBinary(holeStart) + " and "
          + Bytes.toStringBinary(holeStop) + ".  You need to create a new .regioninfo and region "
          + "dir in hdfs to plug the hole.");
    }
Returns descriptor common to all regions. null if are none or multiple!
hbase-server/src/main/java/org/apache/hadoop/hbase/util/HbckTableInfo.java