@Deprecated
  public static boolean matchingTags(final Cell left, final Cell right) {
    return PrivateCellUtil.matchingTags((ExtendedCell) left, (ExtendedCell) right);
  }
@deprecated Since 3.0.0, will be removed in 4.0.0. Tags are now internal only, you should not
            try to check it through the {@link Cell} interface.
hbase-common/src/main/java/org/apache/hadoop/hbase/CellUtil.java