int expectedNewKeys = (int) (opCount * writeProportion * 2.0);
keyGenerator = new ScrambledZipfianGenerator(recordCount + expectedNewKeys);
} else if(recordSelection.compareTo(Benchmark.LATEST_RECORD_SELECTION) == 0) {
keyGenerator = new SkewedLatestGenerator(insertKeySequence);
} else if(recordSelection.compareTo(Benchmark.FILE_RECORD_SELECTION) == 0) {
keyGenerator = new FileIntegerGenerator(0, keysFromFile);