private String getServerNameForReadRegionServerLastLogRollResult(byte[] row) {
    String s = Bytes.toString(row);
    int index = s.lastIndexOf(NULL);
    return s.substring(index + 1);
  }
Get server's name from rowkey
@param row rowkey
@return server's name
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupSystemTable.java