@Setup(Level.Iteration)
        public void setup() {
            randomLongs = new long[DATA_SET_SAMPLE_SIZE];
            for (int i = 0; i < DATA_SET_SAMPLE_SIZE; i++) {
                this.randomLongs[i] = generateRandomLongWithExactBytesSet(numNonZeroBytes);
            }
        }
Generates a random int32 number which occupies exactly bytesSet in the variable length encoding for int32

@see {@link #generateRandomLongWithExactBytesSet(int)} for implementation details.
jmh-benchmarks/src/main/java/org/apache/kafka/jmh/util/ByteUtilsBenchmark.java