Moving To The Cloud. Developing Apps in the New World of by Dinkar Sitaram

By Dinkar Sitaram

  • "This publication offers a great evaluation of the entire changes which are occurring round Cloud Computing"
    - Dr. Prith Banerjee, Senior vice chairman of analysis and Director, HP Labs


Content:
Front Matter

, Pages i-ii
Copyright

, Page iv
Dedication

, Page v
About the Authors

, Pages xiii-xiv
About the Technical Editor

, Page xv
Contributors

, Pages xvii-xx
Foreword

, Pages xxi-xxii
Preface

, Pages xxiii-xxviii
Chapter 1 - Introduction

, Pages 1-21
Chapter 2 - Infrastructure as a Service

, Pages 23-71
Chapter three - Platform as a Service

, Pages 73-152
Chapter four - software program as a Service

, Pages 153-204
Chapter five - Paradigms for constructing Cloud Applications

, Pages 205-253
Chapter 6 - Addressing the Cloud Challenges

, Pages 255-305
Chapter 7 - Designing Cloud Security

, Pages 307-328
Chapter eight - handling the Cloud

, Pages 329-349
Chapter nine - comparable Technologies

, Pages 351-387
Chapter 10 - destiny traits and learn Directions

, Pages 389-425
Index

, Pages 427-448

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Sample text

By default, S3 replicates data across multiple storage devices, and is designed to survive two replica failures. It is also possible to request Reduced Redundancy Storage(RRS) for noncritical data. RRS data is replicated twice, and is designed to survive one replica failure. , if there are three replicas of the data, an application reading a replica which has a delayed update could read an older version of the data. The technical challenges of ensuring consistency, approaches to solve it and trade-offs to be made are discussed in detail in the Data Storage section of Chapter 5.

5% of all Web traffic. In spite of the high traffic, the response time – close to 2 seconds – is still better than average. To support such high transaction rates with good response time, it must be possible to scale both compute and storage resources very rapidly. Scalability of both compute power and storage is therefore a major challenge for all three cloud models. High scalability requires large-scale sharing of resources between users. As stated earlier, Facebook supports 7 million concurrent users.

However, horizontal hybrid models, where the entire application is replicated in the public cloud and usage of the private cloud is for normal workloads, while the public cloud is used for demand peaks, can be cost-effective. 1. The numbers in the table are intended to be hypothetical and illustrative. 1. The table compares the estimated costs for deployment of an application in both a private and public cloud. The comparison is the total cost over a 3-year time horizon, which is assumed to be the time span of interest.

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