This article is my second time reading Hadoop 0.20.2 notes, encountered many problems in the reading process, and ultimately through a variety of ways to solve most of the. Hadoop the whole system is well designed, the source code is worth learning distributed students read, will be all notes one by one post, hope to facilitate reading Hadoop source code, less detours. 1 serialization core Technology The objectwritable in 0.20.2 version Hadoop supports the following types of data format serialization: Data type examples say ...
Microxml is one of the results of these discussions. Microxml is a backward-compatible, simplified version of XML, where the prominence of some of the participants and the timing of the microxml appear. John Cowan has developed the Microxml parser in Java™ and other related tools. This article describes the technical differences between Microxml and its XML 1.x and related standards. XML is a highly successful technology, but it is not without flaws. After great success ...
As a software engineer, what you want to get from your job is a steady salary, opportunities to get involved in the project, a good springboard for the job, or just being a good friend with other programmers. Here, "efficient", I mean the ability to meet the requirements of the project on time. After a lot of software writing experience, I believe the following practices will help you to learn "efficient" while increasing professional reputation, career life and personal satisfaction 1. Understand your needs The first step to becoming an effective programmer is , To ensure a reasonable allocation of time. Nothing is more than spending time on work that has no future at all ...
In the past, assembly code written by developers was lightweight and fast. If you are lucky, they can hire someone to help you finish typing the code if you have a good budget. If you're in a bad mood, you can only do complex input work on your own. Now, developers work with team members on different continents, who use languages in different character sets, and worse, some team members may use different versions of the compiler. Some code is new, some libraries are created from many years ago, the source code has been ...
There are significant differences in performance, complexity, and speed between Amazon and Windows Azure,iaas cloud. The information on the cloud is always quite simple: hand over your worries, IT managers and we will help you solve everything. Forget to install the server and the engine backup that needs to be double-clicked, and don't worry about thousands of things going wrong. Just give us your credit card number and your data and we can do everything for you. In the past few months, I have been living in a dream, where I built a huge computer king across the world ...
After the JVM platform is incorporated into the Oracle product line, Oracle will make a number of improvements and adjustments to the JVM platform. Content includes features such as enhanced platform modularity and integration, increased multi-core processing support for Java SE, and increased multi-touch support in Java me. Meanwhile, Oracle Development Vice President Adam Messinger at the Qcon Development Conference, Oracle plans to provide a free version of the JVM based on the new fee version, in the pay version of the JVM integrated hotspot JVM and Jrocki ...
Pig is a Yahoo donated project to Apache and is currently in the Apache incubator, but the basic functionality is already available. Today I would like to introduce you to this useful pig.pig is Sql-like language, is built on the mapreduce of an advanced query language, Some operations are compiled into the MapReduce model's map and reduce, and users can define their own capabilities. Yahoo Grid Computing department developed another clone of Google's project: Sawzall. Supported operations ...
Flash is a web-rich media and strong interactive technology developed by Macromedia Inc. (now acquired by Adobe), originally designed to develop interactive or animated web site components. Flash has made rapid progress in recent years, according to Adobe Statistics, its internet PC desktop penetration rate reached an astonishing 99%, while Java is 85.1%. At present, Flash is more vigorously to the PDA and smartphone terminal development. Flash technology contains a set of programmable scripting parsers, called ActionScript, that use with ...
Groovy is a JVM based Agile development language that combines many of the powerful features of Python, http://www.aliyun.com/zixun/aggregation/13430.html, >ruby, and Smalltalk. The main features of Groovy include: An agile dynamic language based on a Java virtual machine. Built on the powerful Java language and added from Python,ruby and Smalltalk ...
The small game is a more vague concept, it is relative to the bulky http://www.aliyun.com/zixun/aggregation/17352.html "> stand-alone games and network games, refers to all small, play simple game, Usually this kind of game to casual puzzle class, there is a stand-alone version of the Web version, embedded in the Web page for the Flash format. Action class small game sports games small game puzzle games small game adventure class games chess class ...
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