The era of big data has arrived, accompanied by the spring of crawlers.
1. Distributed crawler is to install crawlers on multiple computers, share queues, and eliminate duplication, so that multiple crawlers do not climb the content that other crawlers have climbed, so as to realize joint collection.
When we do the crawler business, we are often hindered by the anti-crawler mechanism of the target website, especially the distributed crawler. Because the information collection and collection speed is too fast, it often brings huge load to the server of the other party, so we don't have to guess that you are a crawler, how can you be blocked. To solve this problem, using a proxy IP address is undoubtedly a shortcut. In the case of a blocked IP address, change the IP address to continue access.
2, new website in order to ensure the quality of search engine optimization, first fill up a little bit of content, but in the face of a large amount of filling, it is really time-consuming and difficult, so many webmasters in the new website using distributed crawler capture information to ensure that the site regularly updated.
Distributed crawler can be understood as cluster crawler in literal sense. If there is crawler task, it can run with multiple machines at the same time, which greatly improves the operation efficiency.
However, distributed crawler is not a permanent problem. While improving efficiency, the probability of triggering anti-crawler will be greatly increased. To ensure the smooth use of distributed crawler, it is very important to have a large number of IP and good quality HTTP proxy IP resources, which can save manpower and reduce costs, and get twice the result with half the effort.
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