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mapreduce parallel programming hadoop high level parallel programming functional programming machine learning distributed system treewidth graph theory spark bulk synchronous parallel social network survey algorithm optimization pattern recognition graph pattern-recognize linked data stage programming domain specific language delite/lsm automatic parallelization program transformation homomorphism dsl pig prefix sum scan hdfs data structure tree-like data structure hieratical clustering parallel computing tree algorithm succinct data structure neuron network mpi generate test aggregate list homomorphism knapsack cluster management data icd coding nlp ml database nosql acid transaction hive presto benchmark perfromance bigdata sql tcp-h tcp-ds query bsp apache hama programming model accumulation influence maximization target set selection k-tree analysis complexity theory combinatorial optimization np-hard problems search engines casandra batch big data sysrem architecture scheduling erp