March 2025
Intermediate to advanced
612 pages
19h 46m
Italian
Content preview from Progettazione di sistemi su AWS
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Capitolo 15. Progettare un crawler web e un motore di ricerca
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Tu hai organizzato una riunione con i tuoi cari durante le feste. Ami cucinare e hai deciso di preparare tutto da solo, ma non hai le ricette dei piatti che vuoi preparare. Qual è la migliore soluzione possibile? Potresti chiedere ai tuoi amici se hanno le ricette o cercare nei libri di cucina, ma una soluzione semplice ed efficace è la ricerca su Google. Google cerca su internet e trova i risultati migliori per preparare un determinato piatto. Ma come fa Google a trovare la risposta perfetta in un mare di informazioni così vasto? In questo capitolo cercheremo di capirlo scavando nell'architettura di questi sistemi di ricerca.
Ad alto livello, l'intero sistema è composto da due sottosistemi: un web crawler e un motore di ricerca, come mostrato nella Figura 15-1. Un web crawler è essenzialmente un software responsabile della scansione dei contenuti web. I contenuti di Internet crescono in modo esponenziale e i web crawler devono scorrere regolarmente i contenuti per mantenere i risultati più aggiornati. Il motore di ricerca si trova in cima ai contenuti accumulati dai web crawler e li archivia in modo tale da poter cercare le parole chiave ricercate dagli utenti nei contenuti e presentare i risultati più utili.
Con questa conoscenza di base, iniziamo a raccogliere i requisiti funzionali ...
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