Distributed File System with Transactional Semantics

The TCPServer program include following three java files
- TCPServer.java
- RequestHandler.java
- TxnTable.java

How to Run the TCPServer
1. Run “sh build.sh" to compile the program.
2. Run “sh run.sh <ipaddress> <port> <directory>" to run the program. No validation check for passed directory. as we assume you will pass in existing directory.

How to Exit the TCPServer
- Use Ctrl-C to exit the TCPServer, all the log files under the directory will be deleted.

LOG Implementation:
There are two sorts of log file
- “.serverLog": record all transactions state before crash for server recovery. It will only be deleted when the Server exit using "Ctrl-C.

- "." + transactionId: one log file for each transaction, record all details of each transaction for server recovery. It will be deleted after that transaction being committed or abortted. 


TimeOut Implementation:
30 seconds Timeout is implemented for each transaction for states including NEW_TXN, UNCOMMITTED, RESENDING. If the timer is expired, we assume that the client has crashed, the transaction will be aborted and the transaction detail log file will be deleted.