Distributed crawler reduces the pressure of crawler collection
In the process of web crawler collection, many workers will encounter the following two situations:
The speed of information collection is getting slower and slower, and the work efficiency is getting lower and lower;
It is easy to be blocked even if the proxy ip is used.
Why do the above problems still occur after using a proxy ip? Many users do not understand, they will find a proxy ip supplier for a theory, and the supplier’s proxy ip quality problem may be suspected for the first time. In fact, proxy ip is not a panacea. Proxy ip is also ordinary ip. It just uses quantity to share the work pressure. In the past, one ip needed to complete 3 million web pages. Now with proxy ip, hundreds of thousands of ips can be used. Share the pressure.
So how should we reduce the pressure of crawling?
When web crawlers collect data, we can use distributed crawling methods.
What is a distributed crawler?
In our simple and easy-to-understand explanation, the amount of work one person can do is completed by five people.
Many users will use a single machine and a single thread to complete the collection task, (for example, it needs to collect 3 million web pages, that is, a single machine and a single thread to complete the task of these 300 web pages) This method is not too problematic, mainly because of the data collection cost. Long time, high ip pressure.
Now using distributed crawlers, 6 machines can be used to share these 3 million web pages, that is, an average of 500,000 web pages can be completed on average, which not only improves work efficiency but also shares IP pressure.
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