Over the past few weeks, Yahoo have been preparing for the latest version of the Yahoo! Search crawler with some infrastructure updates, which recently caused a variance in our crawl behavior.
With everything now in place, the rollout has officially begun. The new Yahoo! Slurp 3.0 recognizes the same user-agent and all robots.txt directives for ‘Yahoo! Slurp,’ though it’ll identify itself as Slurp 3.0 in your web logs.
As the new software undergoes a phased rollout to our production crawlers over the next several weeks, you’ll see the following changes:
a) The crawlers will start crawling from a different and much smaller set of IP addresses, but it’ll still be from the crawl.yahoo.net domain. Any reverse DNS checks to identify our crawler will continue to work. Please note that if you’re using IP-based recognition of our crawlers, you might see a drop in crawl/coverage from Yahoo! We strongly recommend that you move to reverse DNS-based identification of Yahoo! Slurp if you’re using any other method to avoid this problem. The current set of IPs will disappear from your web logs in the next several weeks.
b) The crawlers will also publish a new user-agent, ‘Yahoo! Slurp/3.0.’ Existing robots.txt directives for ‘Slurp’ or ‘Yahoo! Slurp’ will continue to work, but if you have directives specific to ‘Slurp/2.0,’ they won’t be recognized by the new crawler (though usage of the ‘Slurp/2.0′ user-agent is very rare on the web, so you won’t likely be affected). We recommend specifying the shorter version of: User-agent: Slurp. Check out “How do I prevent my site or certain subdirectories from being crawled?” on our Help page for more details.
These changes will affect the main Yahoo! Web Search crawlers. Crawlers that similarly respect the Yahoo! Slurp directive but identify themselves more specifically, such as Yahoo! Slurp China and others, will not be impacted.
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