1.1. 前言
我们计算外链点击数经过这四个步骤:
Mapper: 将以行数据解析成 key=外链点击数 value=1的形式文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
Shuffle: 通过Shuffle后的结果会生成以 key 的值排序的 value迭代器文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
结果如: 外链点击数 [1, 1, 1 ... 1, 1]文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
Reduce 1: 在这边我们计算出 外链点击数 的访问量文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
输出如: None [sum([1, 1, 1 ... 1, 1]), key]文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
Reduce 2: 对sum([1, 1, 1 ... 1, 1]) 进行排序并输出 TOP 100文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
输入如: 331136 "www.ttmark.com"文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
1.2. 代码
more mr_url_ref.py
# -*- coding: utf-8 -*-
from mrjob.job import MRJob
from mrjob.step import MRStep
from ng_line_parser import NgLineParser
import heapq
class MRUrlRef(MRJob):
ng_line_parser = NgLineParser()
def mapper(self, _, line):
self.ng_line_parser.parse(line)
yield self.ng_line_parser.reference_url, 1 # 外链域名
def reducer_sum(self, key, values):
"""统计 VU"""
yield None, [sum(values), key]
def reducer_top100(self, _, values):
"""访问数降序"""
for cnt, path in heapq.nlargest(100, values):
yield cnt, path
def steps(self):
return [
MRStep(mapper=self.mapper,
reducer=self.reducer_sum),
MRStep(reducer=self.reducer_top100)
]
def main():
MRUrlRef.run()
if __name__ == '__main__':
main()
运行统计和输出结果文章源自运维生存时间-https://www.ttlsa.com/python/python-big-data-analysis-req-count-mrjob/
python mr_url_ref.py < www.ttmark.com.access.log No configs found; falling back on auto-configuration Creating temp directory /tmp/mr_url_ref.root.20160924.141646.495410 Running step 1 of 2... reading from STDIN Running step 2 of 2... Streaming final output from /tmp/mr_url_ref.root.20160924.141646.495410/output... 574546 "-" 331136 "www.ttmark.com" 32990 "m.baidu.com" ...... 5 "www.seo3.org" 5 "www.paixie.net" 5 "www.google.ro" Removing temp directory /tmp/mr_url_ref.root.20160924.141646.495410...
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