c.writeNonRoot(dos);
assertEquals(c.getNonRootSize(), dos.size());
baos.reset();
dos = new DataOutputStream(baos);
c.writeRoot(dos);
assertEquals(c.getRootSize(), dos.size());
byte[] k = TestHFileWriterV2.randomOrderedKey(rand, i);
numSubEntries += rand.nextInt(5) + 1;
keys.add(k);