Finished BTree multi-thread test. Fixed a bug where a disk-order scan could cause latch-deadlock with other concurrent operations. Fixed a bug where deletes and updates would not throw if their target leaf page is empty (we allow underflow to simply exist).

git-svn-id: https://hyracks.googlecode.com/svn/branches/hyracks_lsm_tree@1122 123451ca-8445-de46-9d55-352943316053
6 files changed