@Parameters
  public static Collection<Object[]> parameters() {
    // HFile versions
    return Arrays.asList(new Object[] { 3, true }, new Object[] { 3, false });
  }
Extremely small block size, so that we can get some index blocks
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestForceCacheImportantBlocks.java