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This article mainly introduces how to improve the efficiency of crawler collection, the article is very detailed, has a certain reference value, interested friends must read it!

Minimize the number of visits to the website, single crawler mainly spends time waiting for a response to a network request.

Minimize website visits, both to reduce their workload, but also to reduce the pressure on the site, reduce the risk of blocking the site. The first step is to optimize the process to make it as simple as possible to avoid repeated retrieval across multiple pages. Then go heavy, generally based on url or id unique judgment, climb no longer continue to climb.

Even if all kinds of methods are exhausted, the number of web pages that can be crawled in a single unit of time is still limited.

Computable time is still very long in the face of a large queue of web pages. In this case, time must be replaced by a machine, which is a distributed crawler. Distribution is not reptilian, and it does not have to be. For tasks that are independent of each other and do not communicate, tasks can be manually divided and executed on multiple machines, reducing the workload of each machine and shortening the working time. The two methods mentioned above to improve the efficiency of crawler collection, I hope to help you, in addition, the collection process should also pay attention to the anti-crawling mechanism of the target site.

The above is "how to improve the efficiency of crawler collection" all the content of this article, thank you for reading! Hope to share the content to help everyone, more relevant knowledge, welcome to pay attention to the industry information channel!

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