@VisibleForTesting
  public static long getDefaultFileLength() {
    return DEFAULT_FILE_LENGTH;
  }
@Test
  public void testLargeBlocks()
      throws Exception {
    final String segmentName = "someSegment";
    PinotDataBufferMemoryManager memoryManager = new MmapMemoryManager(_tmpDir, segmentName);
    final long s1 = 2 * MmapMemoryManager.getDefaultFileLength();
    final long s2 = 1000;
    final String col1 = "col1";
    final String col2 = "col2";
    final byte value = 34;
    PinotDataBuffer buf1 = memoryManager.allocate(s1, col1);

    // Verify that we can write to and read from the buffer
    ByteBuffer b1 = buf1.toDirectByteBuffer(0, (int) s1);
    b1.putLong(0, s1);
    Assert.assertEquals(b1.getLong(0), s1);
    b1.put((int) s1 - 1, value);
    Assert.assertEquals(b1.get((int) s1 - 1), value);

    PinotDataBuffer buf2 = memoryManager.allocate(s2, col2);
    ByteBuffer b2 = buf2.toDirectByteBuffer(0, (int) s2);
    b2.putLong(0, s2);
    Assert.assertEquals(b2.getLong(0), s2);

    File dir = new File(_tmpDir);
    File[] files = dir.listFiles();
    Assert.assertEquals(files.length, 2);

    Arrays.sort(files, new Comparator<File>() {
      @Override
      public int compare(File o1, File o2) {
        return o1.getName().compareTo(o2.getName());
      }
    });

    String fileName = files[0].getName();
    Assert.assertTrue(fileName.contains(segmentName));

    fileName = files[1].getName();
    Assert.assertTrue(fileName.contains(segmentName));

    buf1.close();
    buf2.close();

    memoryManager.close();

    List<String> allocationContexts = PinotDataBuffer.getBufferInfo();
    Assert.assertEquals(allocationContexts.size(), 0);
    Assert.assertEquals(new File(_tmpDir).listFiles().length, 0);
  }