如何在 Windows 10 中的 cmd shell 上的笔记本电脑上本地运行 mapreduce 程序

Question

I am trying to run locally MapReduce program on a laptop install hadoop 2.8 version. i am confused how to use that below command in Cmd shell.

This is my command and also share the mapper and reducer code. and my data in CSV file.

D:\hadoop\bin\hadoop jar D:\hadoop\share\hadoop\tools\lib\hadoop-streaming-2.3.0.jar 
-D mapred.reduce.tasks=0
-file /reducer.py -mapper "mapper.py" 
-input /data2.csv -input /data2.csv 
-output /output

#!/usr/bin/python3
#mapper.py
import sys

# input comes from STDIN (standard input)
for line in sys.stdin:
    line = line.strip()
    line = line.split(",")

    if len(line) >=2:
        sex = line[1]
        age = line[2]
        print ('%s\t%s' % (sex, age))

#!/usr/bin/python3
#Reducer.py
import sys

sex_age = {}

#Partitoner
for line in sys.stdin:
    line = line.strip()
    sex, age = line.split('\t')

    if sex in sex_age:
        sex_age[sex].append(int(age))
    else:
        sex_age[sex] = []
        sex_age[sex].append(int(age))

#Reducer
for sex in sex_age.keys():
    ave_age = sum(sex_age[sex])*1.0 / len(sex_age[sex])
    print ('%s\t%s'% (sex, ave_age))

Answer 1

That command should work the same in any Hadoop environment.

FWIW, you should probably switch to using at least Pyspark