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Problem Statement:

Provide a design overview of a basic search engine. Your search engine system must support the following:

- *Retrieval:* The search engine should display a list of relevant web pages in response to a user query. The results should include the page title, URL, and a brief summary.
- *Indexing:* The system should be able to crawl and index web pages from the Internet. The indexing process should store metadata about the web pages, such as their URL, title, and a brief summary.
- *Scalability:* The system should be designed to handle a large number of queries and indexed web pages, ensuring that response times remain low as the search engine scales.

Finer concerns such as query processing & page ranking can be briefly addressed, but are not mandatory.

Table of Contents:
0:00 - Requirements
0:20 - How Search Works
1:57 - API: Accepting Search Queries
2:16 - Database: Storing Site Metadata
4:19 - Database Demands
4:51 - Page BLOB Store
5:17 - Database Sharding
6:10 - Global Index
6:33 - Text Index
7:09 - The System Thus Far
7:52 - Crawling
9:06 - robots.txt Cache
9:24 - Crawler Demands
10:31 - The System So Far
11:04 - URL Frontier: Priority
11:39 - URL Frontier: Politeness
12:01 - Naive URL Frontier
12:31 - Multiple Queues
13:35 - Solving for Politeness
15:51 - URL Frontier: Recap
16:16 - URL Frontier Demands
17:24 - Full Design Review
17:49 - Extensions
19:10 - Visit interviewpen.com

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