如何利用MapReduce Mapper编写统计样例代码中的Key?
“python,from mrjob.job import MRJob,,class MRWordCount(MRJob):,, def mapper(self, _, line):, for word in line.split():, yield (word, 1),, def red......
“python,from mrjob.job import MRJob,,class MRWordCount(MRJob):,, def mapper(self, _, line):, for word in line.split():, yield (word, 1),, def red......
“python,def mapper():, for line in input_data:, data = line.split("t"), if len(data) > 12:, key = (data[4], data[5]), value = int(data[10]), yield ......
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