collab

An Incentive Based Self Stabilizing P2P File Storage System. Developed by a team from IIT Kharagpur as a term project for the subject 'Distributed Systems' during the Spring 2016 session

Developers

• Suman Mondal
• Sourav Bhattacharjee
• Midhun George
• Sumitro Bhaumik

Features

• Nodes join together in the shape of a ring
• The ring can tolerate upto 1 fault
• Can upload and download files from each other
• Incentive and penalty based on upload to download ratio
• Any node can be leader
• Redundant links in both forward and backward directions
• An implementation of cached queries so that repeat queries are processed faster
• Has an administrative menu which has lots of features to see the workings of the system like
  • See list of files which are hosted by itself
  • See list of files which are downloaded by itself
  • See finger table
  • See cache

Changelog

• Added a hash function which takes a string and a key space as input and returns a number. Key space is defined in the config file
• Made the application as a single file
• Added a configuration file named config.py which consists of getter functions of different constants which are used by the various components of the system
• Daemonized the listener thread
• All downloads will take place in the current directory of the application while the uploads are saved in the collab directory
• Integration of hash function
• Made a dictionary of files stored in the current node
• Upload and download amounts now currently reflect what actually happens
• Made the sleep function simpler
• Added more comments to the constructor and the import section
• Downloads now take place in separate folders
• Updated README files with individual responsibilities
• Added a shell script which will delete all folders created due to the system
• Huge update from Suman. I made some purely cosmetic changes to Suman's code

How to start the Collab system

• Run the following command for each node
• python collab.py for the first node
• python collab.py IP_ADDRESS where IP_ADDRESS can be the IP of node which has already joined the system

Note

The application takes the IP address according to a bash script called inside the a python script. Currently, it's set to take the IP address of the interface named eth0. In a later update, it will be configurable by editing the config file