tree 16a73ff30edcc6b46d1d1efc28db76ba69990bbe
parent baec39a7ec19f4e7c39ecee1ed6a4d8dcbf136f3
author Ian Maxon <imaxon@apache.org> 1447978042 -0800
committer Ian Maxon <imaxon@apache.org> 1448298034 -0800

Make LSM bulkload append-only and write-once.

Allows for usage of LSM indexes with underlying storage that is append-only.
This also results in a small improvement for LSM component bulk load speed.

- Tree metadata (filters, etc) now lie at the back of the tree file in
  append-only mode.
-- Note that you should *not* ever give the append-only flag on bulk-load,
   if the tree is ever to be modified in place.
- Append-only operations bypass the buffer cache for writes, but utilize
  the buffer cache for memory allocation and reads.
- Addresses ASTERIXDB-1059

Change-Id: I80fb891b5310252143854a336b591bf3f8cd4ba7
Reviewed-on: https://asterix-gerrit.ics.uci.edu/255
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Young-Seok Kim <kisskys@gmail.com>
Reviewed-by: Murtadha Hubail <hubailmor@gmail.com>