BitTorrent-like File Sharing System

A distributed file sharing system using MPI and threads that mimics BitTorrent's peer-to-peer architecture.

Components

Tracker (rank 0)

• Maintains list of files in system
• Tracks which clients are seeds/peers for each file
• Handles peer registration and file information
• Processes update requests and network state changes

Peers (rank > 0)

• Run concurrent download and upload threads
• Download missing chunks randomly from seeds/peers, to distribute load evenly
• Act as seeds for complete files they own
• Update network view every 10 downloaded chunks
• Write completed downloads to disk as clientX_fileY

Communication

• DOWNLOAD_TAG (1): Request file chunks
• UPLOAD_TAG (2): Response with chunk data
• UPDATE_TAG (3): Network state updates

Data Structures

• FileData: Stores file info and chunk hashes
• Args: Contains peer state for threads
• Seeds/Peers matrices: Track file ownership