Book Image

Hadoop Essentials

By : Shiva Achari
Book Image

Hadoop Essentials

By: Shiva Achari

Overview of this book

This book jumps into the world of Hadoop and its tools, to help you learn how to use them effectively to optimize and improve the way you handle Big Data. Starting with the fundamentals Hadoop YARN, MapReduce, HDFS, and other vital elements in the Hadoop ecosystem, you will soon learn many exciting topics such as MapReduce patterns, data management, and real-time data analysis using Hadoop. You will also explore a number of the leading data processing tools including Hive and Pig, and learn how to use Sqoop and Flume, two of the most powerful technologies used for data ingestion. With further guidance on data streaming and real-time analytics with Storm and Spark, Hadoop Essentials is a reliable and relevant resource for anyone who understands the difficulties - and opportunities - presented by Big Data today. With this guide, you'll develop your confidence with Hadoop, and be able to use the knowledge and skills you learn to successfully harness its unparalleled capabilities.

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Hadoop Essentials
Shiva Achari
Apr, 2015 | 194 pages
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Table of Contents (15 chapters)
Hadoop Essentials
Hadoop Essentials
Credits
Credits
About the Author
About the Author
Acknowledgments
Acknowledgments
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introduction to Big Data and Hadoop
Introduction to Big Data and Hadoop
V's of big data
Understanding big data
Who is creating big data?
Big data use case patterns
Hadoop
Pillars of Hadoop
Data access components
Data storage component
Data ingestion in Hadoop
Streaming and real-time analysis
Summary
2
Hadoop Ecosystem
Hadoop Ecosystem
Traditional systems
The Hadoop use cases
Hadoop's basic data flow
Hadoop integration
The Hadoop ecosystem
Distributed filesystem
Distributed programming
NoSQL databases
Data ingestion
Service programming
Scheduling
Data analytics and machine learning
System management
Summary
3
Pillars of Hadoop – HDFS, MapReduce, and YARN
Pillars of Hadoop – HDFS, MapReduce, and YARN
HDFS
MapReduce
YARN
Summary
4
Data Access Components – Hive and Pig
Data Access Components – Hive and Pig
Need of a data processing tool on Hadoop
Pig
Hive
Summary
5
Storage Component – HBase
Storage Component – HBase
An Overview of HBase
Advantages of HBase
The Architecture of HBase
The HBase data model
The Schema design
The Write pipeline
The Read pipeline
Compaction
Splitting
Commands
HBase Hive integration
Performance tuning
Summary
6
Data Ingestion in Hadoop – Sqoop and Flume
Data Ingestion in Hadoop – Sqoop and Flume
Data sources
Challenges in data ingestion
Sqoop
Connectors and drivers
Sqoop 1 architecture
Sqoop 2 architecture
Imports
Exports
Apache Flume
Flume architecture
Examples of configuring Flume
Summary
7
Streaming and Real-time Analysis – Storm and Spark
Streaming and Real-time Analysis – Storm and Spark
An introduction to Storm
Storm topology
Storm on YARN
Topology configuration example
An introduction to Spark
Spark framework
Spark architecture
Operations in Spark
Spark example
Summary
Index
Index

Hive

Hive provides a data warehouse environment in Hadoop with a SQL-like wrapper and also translates the SQL commands in MapReduce jobs for processing. SQL commands in Hive are called as HiveQL, which doesn't support the SQL 92 dialect and should not be assumed to support all the keywords, as the whole idea is to hide the complexity of MapReduce programming and perform analysis on the data.

Hive can also act as an analytical interface with other systems as most of the systems integrate well with Hive. Hive cannot be used for handling transactions, as it doesn't provide row-level updates and real-time queries.

The Hive architecture

Hive architecture has different components such as:

  • Driver: Driver manages the lifecycle of a HiveQL statement as it moves through Hive and also maintains a session handle for session statistics.

  • Metastore: Metastore stores the system catalog and metadata about tables, columns, partitions, and so on.

  • Query Compiler: It compiles HiveQL into a DAG of optimized map...

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