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The main goals of a web search engine are quality, e ciency, and scalability. In this tutorial, we focus on the last two goals, providing a fairly comprehensive overview of the scalability and e ciency challenges in large-scale web search engines. In particular, the tutorial provides an in-depth architectural overview of a web search engine, mainly focusing on the web crawling, indexing, and query processing components. The scalability and e ciency issues encountered in these components aredoi:10.1145/2600428.2602291 dblp:conf/sigir/CambazogluB14 fatcat:ldl4l4nas5hcvcclhvdq5755zu