Build ratings, tops, charts. How?


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Tell me where and what to read on the topic of technology and details of the construction of periodic ratings(tops, charts) for a large number of users in conditions of high loads?

I will be glad to link to presentations or articles of major projects, I found nothing=(

Or tell me how to implement it, what storage to use. It is particularly important that ratings periodically and for a large number of users.
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I guess you fit hadoop (http://hadoop.apache.org), see MapReduce
The build speed ratings depends on the capacity of the cluster.
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