1.SparkSQL的发展历程 1.1 Hive and Shark SparkSQL的前身是Shark,给熟悉RDBMS但又不理解MapReduce的技术人员提供快速上手的工具,Hive应运而生,它是当时唯一运行在Hadoop上的SQL-on-Hadoop工具.但是MapReduce计算过程中大量的中间磁盘落地过程消耗了大量的I/O,降低的运行效率,为了提高SQL-on-Hadoop的效率,大量的SQL-on-Hadoop工具开始产生,其中表现较为突出的是: l MapR的Drill l Cl
Catalyst9K系列的里面包含了多款交换机,以及无线控制器,甚至包含了无线AP,如下将简单的介绍这几款产品的情况: 首先,这是一种总体的对应关系: 1.Catalyst9200 Series 主要特点: • full PoE+(IEEE 802.3at) capability(最多48ports,每个口最多30W) • power and fan redundancy • stacking bandwidth up to 160 Gbps • modular uplinks • Layer
Fix catalyst driver in Ubuntu 13.04 / 13.10(墙外文章备份) 1. Introduction I found lots of people struggling to get catalyst driver work in Ubuntu 13.04. This issue has been persistent for some laptops, ever since Ubuntu 13.04 came out, specially for Intel,
Problem L. Stock Trading Robot 题目连接: http://www.codeforces.com/gym/100253 Description CyberTrader is an all-in-one trading solution for investment banks, quantitative hedge funds and proprietary trading groups. It has only one drawback it is not impl