zk1931/jzab — pull request #103 by EasonLiao (2014-09-30 17:33:10+00:00)
Title: transaction log improvements

- Add checksum for each transaction.
- Improve performance. Right now the implementation is pretty naive. We can experiment with pre-allocation, reusing log files, etc..
- Add transaction type. With COP (and maybe NEW_LEADER), it would be nice to know transaction type of each record.