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Sams Teach Yourself Apache Spark in 24 Hours

Apache

Spark

Sams

Teach

Yourself

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Apache Spark is a fast, scalable, and flexible open source distributed processing engine for big data systems and is one of the most active open source big data projects to date. In just 24 lessons of one hour or less, Sams Teach Yourself Apache Spark in 24 Hours helps you build practical Big Data solutions that leverage Spark’s amazing speed, scalability, simplicity, and versatility. This book’s straightforward, step-by-step approach shows you how to deploy, program, optimize, manage, integrate, and extend Spark–now, and for years to come. You’ll discover how to create powerful solutions encompassing cloud computing, real-time stream processing, machine learning, and more. Every lesson builds on what you’ve already learned, giving you a rock-solid foundation for real-world success. Whether you are a data analyst, data engineer, data scientist, or data steward, learning Spark will help you to advance your career or embark on a new career in the booming area of Big Data.

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About This E-Book

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Download from finelybook www.finelybook.com

Sams Teach Yourself Apache

Spark™ in 24 Hours

Jeffrey Aven

800 East 96th Street, Indianapolis, Indiana, 46240 USA

Download from finelybook www.finelybook.com

Sams Teach Yourself Apache Spark™ in 24 Hours

retrieval system, or transmitted by any means, electronic, mechanical,

photocopying, recording, or otherwise, without written permission from the

publisher. No patent liability is assumed with respect to the use of the

information contained herein. Although every precaution has been taken in the

preparation of this book, the publisher and author assume no responsibility for

errors or omissions. Nor is any liability assumed for damages resulting from

the use of the information contained herein.

ISBN-13: 978-0-672-33851-9

ISBN-10: 0-672-33851-3

Library of Congress Control Number: 2016946659

Printed in the United States of America

First Printing: August 2016

Editor in Chief

Greg Wiegand

Acquisitions Editor

Trina McDonald

Development Editor

Chris Zahn

Technical Editor

Cody Koeninger

Managing Editor

Sandra Schroeder

Project Editor

Lori Lyons

Project Manager

Ellora Sengupta

Download from finelybook www.finelybook.com

Copy Editor

Linda Morris

Indexer

Cheryl Lenser

Proofreader

Sudhakaran

Editorial Assistant

Olivia Basegio

Cover Designer

Chuti Prasertsith

Compositor

codeMantra

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marks have been appropriately capitalized. Sams Publishing cannot attest to

the accuracy of this information. Use of a term in this book should not be

regarded as affecting the validity of any trademark or service mark.

Warning and Disclaimer

Every effort has been made to make this book as complete and as accurate as

possible, but no warranty or fitness is implied. The information provided is on

an “as is” basis. The author and the publisher shall have neither liability nor

responsibility to any person or entity with respect to any loss or damages

arising from the information contained in this book.

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for i:=0; i<len(deduplicateSamples); i++ { for j:=0; j< len(sams); j++ { if deduplicateSamples[i].SampleMD5 == sams[j].SampleMD5 { for deduplicateSamples[i].UpdateTime > sams[j].UpdateTime { db.Where(“samplemd5= xxx”).Updates()}}}}对这段代码进行优化

1. 减少数据库更新操作的频率：在循环中，每当 `deduplicateSamples[i].UpdateTime` 大于 `sams[j].UpdateTime` 时，都会执行数据库更新操作。为了减少数据库操作的频率，可以将需要更新的记录先存储在一个列表中，...

Driver claims to not accept jdbcUrl, jdbc:mysql//10.69.72.38:3306/sams?serverTimezone=UTC&useSSL=true&characterEncoding=utf-8

1. Check if the JDBC driver JAR file is included in your project's classpath. 2. Make sure that the JDBC URL is formatted correctly. It should be in the format: "jdbc:mysql://hostname:port/database...

package db; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; public class DBCon { Connection con = null; Statement st = null; ResultSet rs = null; String driver=null; String url = null; String username = null; String password = null; public Connection dbCon() { try { InputStream is=DBCon.class.getClassLoader().getResourceAsStream("db.properties"); Properties prop=new Properties(); try { prop.load(is); driver=prop.getProperty("driver"); url=prop.getProperty("url"); username=prop.getProperty("username"); password=prop.getProperty("password"); } catch (IOException e1) { e1.printStackTrace(); } Class.forName(driver); Class.forName("com.mysql.jdbc.Driver"); url = "jdbc:mysql:///sams?useUnicode=true&characterEncoding=utf8"; username = "root"; password = ""; try { con = DriverManager.getConnection(url, username, password); } catch (SQLException e) { e.printStackTrace(); } } catch (ClassNotFoundException e) { e.printStackTrace(); } return con; } /* * 增删改 / public int query(String sql) { int rs = 0; con = dbCon(); try { st = con.createStatement(); rs = st.executeUpdate(sql); } catch (SQLException e) { close(); e.printStackTrace(); } return rs; } / * 查 / public ResultSet find(String sql) { try { con = dbCon(); st = con.createStatement(); rs = st.executeQuery(sql); } catch (SQLException e) { close(); e.printStackTrace(); } return rs; } / * 关闭数据库 */ public void close() { try { if (rs != null) rs.close(); if (st != null) st.close(); if (con != null) con.close(); } catch (SQLException e) { e.printStackTrace(); } } }有错误

url = "jdbc:mysql:///sams?useUnicode=true&characterEncoding=utf8"; username = "root"; password = ""; ``` 另外，你在 `find` 和 `query` 方法中都使用了 `con = dbCon();` 来获取连接，这会导致每次执行...

学生成绩管理系统Python代码

sams = [] # 添加成绩 elif user_choose == 2: # 获取要添加的学生的信息，姓名，大英，高数，思修，大学生行为与修养 sam_name = input('请输入学生的姓名：') sam_yingyu = input('请输入学生的大英成绩：') ...

流浪动物管理系统er图

流浪动物管理系统（Stray Animal Management System, SAMS）的ER图（Entity-Relationship Diagram）是一种用于数据库设计的工具，它可以帮助我们可视化不同实体之间的关系。在设计中，通常会包括以下几个关键元素： ...

用c++语言编程一个完整代码首先，创建一个基类 Book，包含书的基本信息，如书名、作者、出版社等。这个类可以包含构造函数、析构函数、复制构造函数等成员函数。为了实现多态输出，可以在这个类中编写一个虚函数 print()，用于输出图书的信息。然后，可以创建一个派生类 EBook，继承自 Book 类，并增加一些新的成员变量，如电子书的文件格式等。这个类中也可以包含构造函数、析构函数等成员函数。在主函数中，可以创建一个指向 Book 类的指针数组，然后动态地创建 Book 类的对象和 EBook 类的对象，将这些对象存储到指针数组中。然后，可以通过循环来调用每个对象的 print() 函数，实现多态输出。

books[1] = new EBook("C++ Primer Plus", "Prata", "Sams", "PDF"); for (int i = 0; i ; ++i) { books[i]->print(); std::cout ; } delete books[0]; delete books[1]; return 0; } ``` 在这个示例...

Develop applications for the big data landscape with Spark and Hadoop. This book also explains the role of Spark in developing scalable machine learning and analytics applications with Cloud technologies. Beginning Apache Spark 2 gives you an introduction to Apache Spark and shows you how to work with it. Along the way, you’ll discover resilient distributed datasets (RDDs); use Spark SQL for structured data; and learn stream processing and build real-time applications with Spark Structured Streaming. Furthermore, you’ll learn the fundamentals of Spark ML for machine learning and much more. After you read this book, you will have the fundamentals to become proficient in using Apache Spark and know when and how to apply it to your big data applications. What You Will Learn Understand Spark unified data processing platform How to run Spark in Spark Shell or Databricks Use and manipulate RDDs Deal with structured data using Spark SQL through its operations and advanced functions Build real-time applications using Spark Structured Streaming Develop intelligent applications with the Spark Machine Learning library Who This Book Is For Programmers and developers active in big data, Hadoop, and Java but who are new to the Apache Spark platform.

Sams Teach Yourself Emacs in 24 Hours [Xunil].chm

There is no doubt that Emacs is the most powerful text editor available! Unfortunately Emacs has quite a reputation for being difficult to learn and hard to use. With this book this will not be true for you, for the following reasons: The book is organized in a way that makes it possible for you, within just a few hours, to learn enough for your daily work with Emacs. The focus in this book is on usability, rather than on obscure features that only a few people need. Thus several extensions to Emacs are discussed (including on-the-fly spell-checking, file templates, and major modes for editing LaTeX, HTML, C, C++, and Java). In Hour 1, "Introduction to Emacs," you will learn how to bind functions to the function keys (F1, F2, F3...F12). The CD-ROM accompanying this book contains a keyboard quick reference card, which you may edit to include your customizations. This way, you do not need to learn difficult keybindings. Accompanying the book is a CD-ROM with many extensions to Emacs that you can play with in your spare time. Using these extensions, you can customize Emacs in even more ways than those described in the pages of this book. The CD also contains a file with features that might seem like they are missing in Emacs, when you read the book. Often these features are not missing; to avoid discussing details that are too technical, however, a fix has been made to ensure that the topics are as easily understandable as possible. (This file is discussed in Hour 1.) The focus in the book is on using Emacs with a graphical interface, either X Window or Microsoft Windows. Thus no time will be wasted on discussing how to make Emacs work when you have a monitor that displays only 25 lines with 80 characters each.

Sams Teach Yourself TCPIP in 24 Hours(6th) azw3

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for i:=0; i<len(deduplicateSamples); i++ { for j:=0; j< len(sams); j++ { if deduplicateSamples[i].SampleMD5 == sams[j].SampleMD5 { for deduplicateSamples[i].UpdateTime > sams[j].UpdateTime { db.Where(“samplemd5= xxx”).Updates()}}}}对这段代码进行优化

Driver claims to not accept jdbcUrl, jdbc:mysql//10.69.72.38:3306/sams?serverTimezone=UTC&useSSL=true&characterEncoding=utf-8

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1、设信号sa(2pit)对载频信号cos(1000t)进行幅度调制，用MATLAB编程绘出已调幅信号的频谱。