anchor.diff:  +
   . Bloom filter version = 3 (int). There used to be a DynamicByteBloomFilter class that had the Bloom   filter version number 2
   . The total byte size of all compound Bloom filter chunks (long)
  -. Number of hash functions (int
  +. Number of hash functions (int)
   . Type of hash functions (int)
   . The total key count inserted into the Bloom filter (long)
   . The maximum total number of keys in the Bloom filter (long)
  
positive.code: . Entries.
    Each entry contains:
  +
  . Offset of the block referenced by this entry in the file (long)
  . On>disk size of the referenced block (int)
  . Key.
    The length can be calculated from entryOffsets.
  
  
  
negative.code: ==== Fixed file trailer format differences between versions 1 and 2
  
  The following table shows common and different fields between fixed file trailers in versions 1 and 2.
  Note that the size of the trailer is different depending on the version, so it is ''fixed'' only within one version.
  However, the version is always stored as the last four-byte integer in the file.
  
  .Differences between HFile Versions 1 and 2
  