@Override
  @SuppressWarnings("unchecked")
  public boolean equals(Object other) {
    return other instanceof Pair && equals(first, ((Pair) other).first)
      && equals(second, ((Pair) other).second);
  }
Return the second element stored in the pair.
hbase-common/src/main/java/org/apache/hadoop/hbase/util/Pair.java