@Override
    public int hashCode() {
      return new HashCodeBuilder().append(conn).append(conf).append(fs).append(tn).toHashCode();
    }
Returns the {@link FileArchiverNotifier} instance for the given {@link TableName}.
@param tn The table to obtain a notifier for
@return The notifier for the given {@code tablename}.
hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/FileArchiverNotifierFactoryImpl.java