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You can use distributed hashing to tackle the problem. All the hashes will be stored and maintained in different hash tables with consistent hashing on multiple machines(in memory) IO cost will be associated to locate and load the hash value but it should still be better then storing the hash in the file system. Memcached works on the same principle. So you have a unique hashkey generated for each unique url. When you do a cache_get($url) if its =1 then you have a unique url.
- aniruddhkiller January 20, 2015However for this method to work you have to iterate through all the urls twice.