map-reduce: A Python implementation of the MapReduce protocol.

Usage:

Requirements (once per system):

• Docker image: python:3.9.7-alpine

either (with internet connection) [~50mb]:

docker pull python:3.9.7-alpine

or (from provided tar image):

docker load -i <img_path>`

• Docker network named "distributed"

docker network create --driver=bridge --subnet=172.18.0.0/16 --ip-range=172.18.1.0/25  \
                      --gateway=172.18.1.254 distributed

Usage (every time):

• Raise and tail k server containers (with cd on project root):

./scripts/batch_run server k -dt

• Startup client request.

./scripts/run_client

Which runs the dedicated python client script in ./map_reduce/client/client.py, it requires the initial data to map of signature [(IN_KEY, IN_VALUE)], as well as the map and reduce functions with the following signature:

def map(in_key: IN_KEY, in_value: IN_VALUE) -> [(OUT_KEY, MID_VALUE)]:
    pass

def reduce(out_key: OUT_KEY, values: [MID_VALUE]) -> OUT_VAL:
    pass

The provided API then eventually returns through ServerInterface.await_results() the MapReduce procedure's result: a dict or key/value pair iterable of type signature { OUT_KEY: OUT_VAL }.