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MP3 — Distributed Transactions

Two-phase locking (2PL) for isolation and two-phase commit (2PC) for atomicity across branch servers.

Build

make

Produces mp3/server and mp3/client.

Config file

Each line names a branch and its host/port:

A sp26-cs425-3701.cs.illinois.edu 1234
B sp26-cs425-3702.cs.illinois.edu 1234
C sp26-cs425-3703.cs.illinois.edu 1234
D sp26-cs425-3704.cs.illinois.edu 1234
E sp26-cs425-3705.cs.illinois.edu 1234

Running a server

./mp3/server <branch> <config>
# e.g.
./mp3/server A config.txt

Start one process per branch. Each server listens on the port from the config file.

Running the client

./mp3/client <id> <config>
# e.g.
./mp3/client foo config.txt

The client connects to a randomly selected server as coordinator and reads commands from stdin.

Client commands

BEGIN
DEPOSIT <branch>.<account> <amount>
WITHDRAW <branch>.<account> <amount>
BALANCE <branch>.<account>
COMMIT
ABORT

Local test

cd sample_test
./run.sh

Starts five servers on ports 10001–10005, runs two test cases, and diffs output against expected results.