static ExtendedCell createCell(final byte[] keyRow, final byte[] value) {
    return ExtendedCellBuilderFactory.create(CellBuilderType.DEEP_COPY).setRow(keyRow)
      .setFamily(HConstants.EMPTY_BYTE_ARRAY).setQualifier(HConstants.EMPTY_BYTE_ARRAY)
      .setTimestamp(HConstants.LATEST_TIMESTAMP).setType(KeyValue.Type.Maximum.getCode())
      .setValue(value).build();
  }
HFile is Cell-based. It used to be byte arrays. Doing this test, pass Cells. All Cells
intentionally have same coordinates in all fields but row.
@param i     Integer to format as a row Key.
@param value Value to use
@return Created Cell.
hbase-diagnostics/src/main/java/org/apache/hadoop/hbase/HFilePerformanceEvaluation.java