标签：get 提交 图片 usr stream mapred /usr hadoop split()
1. 用Python编写WordCount程序并提交任务
#！/usr/bin/env python import sys for line in sys.stdin: line=line.strip() words=line.split() for word in words: print ‘%s\t%s‘ % (word,1)
#!/usr/bin/env python from operator import itemgetter import sys current_word = None current_count = 0 word = None for line in sys.stdin: line = line.strip() word, count = line.split(‘\t‘, 1) try: count = int(count) except ValueError: continue if current_word == word: current_count += count else: if current_word: print "%s\t%s" % (current_word, current_count) current_count = count current_word = word if word == current_word: print "%s\t%s" % (current_word, current_count)
2.将其权限作出相应修改
chmod a+x /home/hadoop/wc/mapper.py
chmod a+x /home/hadoop/wc/reducer.py
3.本机上测试运行代码
echo "foo foo quux labs foo bar quux" | ./mapper.py echo "foo foo quux labs foo bar quux" | ./mapper.py | sort -k1,1 | ./reducer.py
2. 用mapreduce 处理气象数据集
编写程序求每日最高最低气温，区间最高最低气温
标签：get 提交 图片 usr stream mapred /usr hadoop split()
原文地址：https://www.cnblogs.com/lzhshuai/p/9021937.html
