for (long i = 0; i < opts.iterations; i += 1) {
Text[] columns = randTerms.get(rand.nextInt(randTerms.size()));
bs.clearScanIterators();
bs.clearColumns();
IteratorSetting ii = new IteratorSetting(20, "ii", IntersectingIterator.class);
IntersectingIterator.setColumnFamilies(ii, columns);
bs.addScanIterator(ii);
bs.setRanges(Collections.singleton(new Range()));