Lets say you have 3 descriptions for 100 hotel. Each include basically the hotel, some stuff about rates, how the website is great and other things you offer. The rates, name and anything dynamic thats stored in the database is popped in. You do a standard random echo into the meta description of one of these when the page loads. Will Google keep Re-caching thinking its freshly changed content? Will Google's spider get annoyed and stop indexing your changes? or what?
Re-caching ?? after indexing the parser would process the meta descriptions but it would depend on the wording in the descriptions. for example if words in all of the varied descriptions are also in title tag and description meta tag and body text then the relevancy would be good. Will Google keep Re-caching thinking its freshly changed content? Not sure but what I think you are referring to is the parsing after the indexing, taking the different factors like meta tag, body text, anchor etc and weighting them against factors. Will Google's spider get annoyed and stop indexing your changes? The Google spider can't get annoyed it can just visit your site and gather info that is latter parsed and weighed against several factors in the algorithm. Google says We frequently prefer to display meta descriptions of pages (when available) because it gives users a clear idea of the URL's content. This directs them to good results faster and reduces the click-and-backtrack behavior that frustrates visitors and inflates web traffic metrics. Meta Description Tags serve two purposes 1. to help the parser categorize the information on a webpage 2. to be displayed as the description in a serp I would instead shoot for a high relevancy to the webpage Being said I would check to see the logs and see which meta description has the best click through rate and the lowest bounce rate and keep it.