private static String getRowQualStr(Cell kv) {
    String rowStr = Bytes.toString(CellUtil.cloneRow(kv));
    String qualStr = Bytes.toString(CellUtil.cloneQualifier(kv));
    return rowStr + "_" + qualStr;
  }
The probability to delete a row/column pair
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestMultiColumnScanner.java