March 2025
Intermediate to advanced
352 pages
9h 37m
Spanish
Content preview from Web Scraping con Python, 3.ª edición
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Capítulo 19. Web Scraping en paralelo
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El rastreo web es rápido. Al menos, ¡suele ser mucho más rápido que contratar a una docena de becarios para que copien datos de Internet a mano! Por supuesto, la progresión de la tecnología y la rueda de molino hedónica exigen que en un momento dado ni siquiera esto sea "suficientemente rápido". Ése es el punto en el que la gente suele empezar a mirar hacia la informática distribuida.
A diferencia de la mayoría de los demás campos tecnológicos, el rastreo web a menudo no puede mejorarse simplemente "lanzando más ciclos al problema". Ejecutar un proceso es rápido; ejecutar dos procesos no es necesariamente el doble de rápido. ¡Ejecutar tres procesos puede hacer que te expulsen del servidor remoto al que estás martilleando con todas tus peticiones!
Sin embargo, en algunas situaciones el rastreo web paralelo, o la ejecución de hilos o procesos paralelos, puede seguir siendo beneficioso:
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Recoger datos de varias fuentes (varios servidores remotos) en lugar de una sola fuente
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Realizar operaciones largas o complejas en los datos recogidos (como hacer análisis de imágenes u OCR) que podrían hacerse en paralelo a la obtención de los datos.
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Recopilar datos de un gran servicio web en el que pagas por cada consulta, o en el que la creación de múltiples conexiones al servicio está dentro de los límites de tu acuerdo de uso.
Procesos ...
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