标签：文件 结果 split() ftp from import line highlight dfs
1. 用Python编写WordCount程序并提交任务
A编写map函数，reduce函数
map函数
import sys
for line in sys.stdin:
line=line.strip()
words=line.split()
for word in words:
print (‘%s\t%s‘ % (word,1))
Reduce函数
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 current_word==word:
print (‘%s\t%s‘ % (current_word,current_count))
B将其权限作出相应修改
chmod a+x /home/hadoop/wc/mapper.py chmod a+x /home/hadoop/wc/reduce.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：文件 结果 split() ftp from import line highlight dfs
原文地址：https://www.cnblogs.com/127li/p/9021921.html
