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mapreduce google app engine lsh data mining database management locality sensitive hashing nosql hadoop concurrency control pattern matching data analytics sql query optimization storage management database query execution hash indexes b-tree indexes database indexes referential integrity query language datalog big data databases amazon aws cloud computing k-means clustering analysis of big data big data analytics paas platform as a service "data mining" "locality sensitive hashing" analytics facebook elastic map reduce map reduce social media data streams mongodb paxos distributed commit failure recovery