private static byte[] rowkey(String s, String... other) {
    StringBuilder sb = new StringBuilder(s);
    for (String ss : other) {
      sb.append(ss);
    }
    return Bytes.toBytes(sb.toString());
  }
Converts cell key to backup set name.
@param current current cell
@return backup set name
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupSystemTable.java