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Distributed Systems (Spring 2020)

This repository contains projects completed as a part of the coursework for Distributed Systems (Spring 2020) taught by Prof. Steve Ko at the University at Buffalo.

Prerequisites

To run the projects, installing Android Studio is a pre-requisite as the individual nodes in the different distributed system scenarios are represented by Android Virtual Devices (AVD) and the communication between these systems is done using Java Socket Programming.

Projects

  1. Simple Messenger - A simple messenger application enabling two Android devices to send messages to each other.

  2. Group Messenger - A messenger applicaiton enabling 5 Android devices to send messages among each other, with Total and FIFO ordering guarentees. This project simulates a typical messenger application like Whatsapp, Telegram etc.

  3. Simple DHT - A simple Distributed Hash Table based on the Chord protocol. This project implements the following

    • ID space partitioning / re-partitioning
    • Ring based routing
    • Handling new nodes joining and nodes leaving the system

  4. Simple Amazon Dynamo DB - A simple implementation of the Replicated Key-Value store explained in Amazon's Dynamo DB paper. This projects implements the following main components.

    • Partitioning
    • Replication
    • Failure handling (Atmost 1 node can fail at any given time)

Usage

  • Create AVDs using the Scripts/create_avd.py file.
  • Run 5 AVDs using the Scripts/run_avd.py file.
  • Enable communication between AVDs using the Scripts/set_redir.py file.
  • To check if the implementation of a project is correct run the corresponding Grading scripts for the project.