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