private CellScanner doCreateCellArray(final int itemsPerList) {
    Cell[] cells = new Cell[itemsPerList];
    for (int i = 0; i < itemsPerList; i++) {
      cells[i] = new TestCell(i);
    }
    return CellUtil.createCellScanner(cells);
  }
Was overflowing if 100k or so lists of cellscanners to return.
hbase-common/src/test/java/org/apache/hadoop/hbase/TestCellUtil.java