Python实现MapReduce 下面使用mapreduce模式实现了一个简单的统计日志中单词出现次数的程序: from functools import reduce from multiprocessing import Pool from collections import Counter def read_inputs(file): for line in file: line = line.strip() yield line.split() def count(file_name…
Python基础-类变量和实例变量 写在前面 如非特别说明,下文均基于Python3 大纲: 1. 类变量和实例变量 在Python Tutorial中对于类变量和实例变量是这样描述的: Generally speaking, instance variables are for data unique to each instance and class variables are for attributes and methods shared by all instances of th…
1.查看hadoop版本 [hadoop@ltt1 sbin]$ hadoop version Hadoop -cdh5.12.0 Subversion http://github.com/cloudera/hadoop -r dba647c5a8bc5e09b572d76a8d29481c78d1a0dd Compiled by jenkins on --29T11:33Z Compiled with protoc From source with checksum 7c45ae7a4592c…
public class Example { String testString = new String("good"); char[] testCharArray = {'a','b','c'}; public static void main(String[] args){ Example ex = new Example(); ex.change(ex.testString,ex.testCharArray); System.out.println(ex.testString)…
