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MapReduce 模式、算法和用例

本文译自MapreducePatterns,Algorithms,andUseCases在这篇文章里总结了几种网上或者论文中常见的MapReduce模式和算法，并系统化的解释了这些技术的不同之处。所有描述性的文字和代码都使用了标准hadoop的MapReduce模型，包括Mappers,Reduces,Combiners,Partitioners,和sorting。如下图所示。基本MapReduce模式计数与求和问题陈述:有许多文档，每个文档都有一些字段组

系统 2019-08-12 09:29:31 3010

各行各业

跟UI自动化测试有关的技术

大家都知道，针对UI的自动化技术一般要支持下列的东西：1.识别窗口能够识别尽量多的窗口种类，支持尽量多的UI技术。比如Win32、WinForm、WPF以及WebPage（这个比较特殊，确切的说不能叫控件）的控件类型2.操作窗口对标准类型的控件方法的支持，比如按下按钮，在Listview中选择Item等3.验证结果实质就是能够拿到控件的状态以及控件相关的信息4.错误恢复这个其实属于自动化测试框架的问题，能从错误的状态恢复，并继续执行。当然写Testcaes

系统 2019-08-12 09:27:36 3010

Jquery

jQuery ajax —— 将类AJAX方法包装起来

上一篇文章，将jQuery.ajax中的一些细节补充完。这篇文章讲解如果将类AJAX方法都包装进jQuery.ajax中。下篇文章则讲解各预过滤器和分发器的细节。为什么要包装起来？我们知道，古老的XMLHttpRequest出于同源策略考虑，是不支持跨域的。所以，在前端想动态加载跨域Javascript脚本，通常是使用被称为ScriptDOMElement的方案，如：varscriptElem=document.createElement("script"

系统 2019-08-12 01:33:22 3010

编程技术

软件安全开发周期 - ＳＤＬ

申明。文章仅代表个人观点，与所在公司无任何联系。1.概述安全开发周期，即SecurityDevelopmentLifecycle(SDL)，是微软提出

系统 2019-08-29 23:34:08 3009

编程技术

《Agile Web Development with Rails》读书笔记

任务B1、创建目录清单前面我们创建的是供卖方使用的管理界面，现在我们接着创建一个供买方使用的界面。首先，我们使用如下语句：rubyscript/generatecontrollerstoreindex在任务A中，我们使用的是rubyscript/generatescaffold来创建product的，而这里我们使用的generatecontroller创建的是store，因为在创建product的时候，我们比较明确所需要做的内容，但是在这里我们还不太明确所

系统 2019-08-29 23:21:40 3009

编程技术

[转]分布式数据库概述

From:http://fineboy.cnblogs.com/archive/2005/08/03/206395.html1．前言随着传统的数据库技术日趋成熟、计算机网络技术的飞速发展和应用范围的扩充，数据库应用已经普遍建立于计算机网络之上。这时集中式数据库系统表现出它的不足：数据按实际需要已在网络上分布存储，再采用集中式处理，势必造成通信开销大；应用程序集中在一台计算机上运行，一旦该计算机发生故障，则整个系统受到影响，可靠性不高；集中式处理引起系统的规

系统 2019-08-29 23:17:18 3009

编程技术

以一种"廉价"的方式获取页面的标题(downmoon)

有朋友问到：“我需要得到一个webpage的title，因为这个title一般都比较靠前，只要取得html的前面少量内容就可以了。因为要取得很多个页面的title,如果下载整个htmlcode，肯定比较浪费时间。.net好像没有现成的类可以干这件事情(取得部分html)，我应该如何去实现？”一种比较"廉价"(即较小成本条件下)的解决思路：第一步：取出含有页面title部分的最小集合。这是“廉价”的关键！第二步：用正则表达式取出和</title</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:21:16</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3009</span></span>  </p> </article><article class="excerpt"> <header> <a title="Android" class="label label-important zj-del-target" href="/category/57">Android<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/14180" title="android内核编译方法" target="_blank" onclick="return recordId('',)">android内核编译方法 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/14180" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/18.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/14180';}else{window.open('/article/14180');}" style="cursor: pointer;">google的android很多人都希望在gphone没有出来之前，把它移植到相关的硬件平台上去。网上看了不少文章，总的感觉是：在这一步走得最远的就是openmoko的一个大师级别的黑客Ben“Benno”Leslie,他曾经试图把目前google发布的android移植到openmoko的平台上去，并且做了10000多行代码的尝试。最终虽然由于openmoko采用比较老的arm920t的内核，而android采用较新的arm926-ej-s内核，而且使用</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:12:47</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3009</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles 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