Overview

A web crawler is a tool designed to browse the internet methodically and systematically to gather information from web pages. When deploying a multithreaded web crawler, one can expect significant performance improvements due to the concurrent fetching of multiple web pages. However, concurrency introduces challenges, especially when multiple threads try to access shared resources like a queue containing URLs. The primary concern is avoiding duplicate work, where two or more threads might end up processing the same URL because of simultaneous access.