This will faciliate loading a block into a type specific result without
first loading the block. This will also allow us to populate the database
index solely from the index.
There is a lot of allocations performed when decoding blocks. These
types can be re-used to reduce allocations in many cases. This change
allows a type specific slice to be passed in to decode funcs to be re-used
if it is large enough.
The existing decode is is left for backwards compatibility but is not
very efficient right now. It may be removed.
This writes a tombstone file containing a line per deleted key. This
file is read when a TSMReader is created and any keys listed in the file
are removed from the index.
This adds some basic file reader/writers for creating the updated TSM file format. It uses a simple
in-memory index without MMAP for now, but will be extended to use and indirect indexing approach as well as MMAPed file access as described in the design doc.
This code is not integrated into the TSM engine yet
Jason Wilder