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[SOLVED] 代写 Java database MapReduce 1. For each problem and data set described below, state how would you setup the key,value pairs as inputs and outputs for mappers and reducers. Also, explain the operation performed by the map and reduce functions given their input. If the mapper or reducer must perform a filtering step before generating its keyvalue pairs, state exactly the type of filtering needed. Assume your Hadoop program uses TextInputFormat as its input format where each record corresponds to a line of the input file. Since the the mapper inputs are the same for all problems below, you only need to specify the mapper outputs. If the problem requires more than one mapreduce jobs, specify the role of each mapreduce function along with their input and output keyvalue pairs.
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