This is a brief tutorial that explains how to make use of Sqoop in Hadoop ecosystem.
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2 About the Tutorial Sqoop is a tool designed to transfer data between Hadoop and relational database servers. It is used to import data from relational databases such as MySQL, Oracle to Hadoop HDFS, and export from Hadoop file system to relational databases. This is a brief tutorial that explains how to make use of Sqoop in Hadoop ecosystem. Audience This tutorial is prepared for professionals aspiring to make a career in Big Data Analytics using Hadoop Framework with Sqoop. ETL developers and professionals who are into analytics in general may as well use this tutorial to good effect. Prerequisites Before proceeding with this tutorial, you need a basic knowledge of Core Java, Database concepts of SQL, Hadoop File system, and any of Linux operating system flavors. Copyright & Disclaimer Copyright 2015 by Tutorials Point (I) Pvt. Ltd. All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We strive to update the contents of our website and tutorials as timely and as precisely as possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt. Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our website or its contents including this tutorial. If you discover any errors on our website or in this tutorial, please notify us at contact@tutorialspoint.com i
3 Table of Contents About the Tutorial Audience i Prerequisites i Copyright & Disclaimer i Table of Contents ii 1. SQOOP INTRODUCTION 1 How Sqoop Works? 1 Sqoop Import 2 Sqoop Export 2 2. SQOOP INSTALLATION 3 Step 1: Verifying JAVA Installation 3 Step 2: Verifying Hadoop Installation 4 Step 3: Downloading Sqoop 11 Step 4: Installing Sqoop 11 Step 5: Configuring bashrc 11 Step 6: Configuring Sqoop 11 Step 7: Download and Configure mysql-connector-java 12 Step 8: Verifying Sqoop SQOOP IMPORT 13 Syntax 13 Importing a Table 14 Importing into Target Directory 16 Import Subset of Table Data 16 Incremental Import 17 ii
4 4. SQOOP IMPORT-ALL-TABLES 19 Syntax SQOOP EXPORT 21 Syntax SQOOP JOB 23 Syntax 23 Create Job (--create) 23 Verify Job (--list) 23 Inspect Job (--show) 24 Execute Job (--exec) SQOOP CODEGEN 25 Syntax SQOOP EVAL 27 Syntax 27 Select Query Evaluation 27 Insert Query Evaluation SQOOP LIST-DATABASES 29 Syntax 29 Sample Query SQOOP LIST-TABLES 30 Syntax 30 Sample Query 30 iii
5 1. SQOOP INTRODUCTION Sqoop The traditional application management system, that is, the interaction of applications with relational database using RDBMS, is one of the sources that generate Big Data. Such Big Data, generated by RDBMS, is stored in Relational Database Servers in the relational database structure. When Big Data storages and analyzers such as MapReduce, Hive, HBase, Cassandra, Pig, etc. of the Hadoop ecosystem came into picture, they required a tool to interact with the relational database servers for importing and exporting the Big Data residing in them. Here, Sqoop occupies a place in the Hadoop ecosystem to provide feasible interaction between relational database server and Hadoop s HDFS. Sqoop: SQL to Hadoop and Hadoop to SQL Sqoop is a tool designed to transfer data between Hadoop and relational database servers. It is used to import data from relational databases such as MySQL, Oracle to Hadoop HDFS, and export from Hadoop file system to relational databases. It is provided by the Apache Software Foundation. How Sqoop Works? The following image describes the workflow of Sqoop. 1
6 Sqoop Sqoop Import The import tool imports individual tables from RDBMS to HDFS. Each row in a table is treated as a record in HDFS. All records are stored as text data in text files or as binary data in Avro and Sequence files. Sqoop Export The export tool exports a set of files from HDFS back to an RDBMS. The files given as input to Sqoop contain records, which are called as rows in table. Those are read and parsed into a set of records and delimited with user-specified delimiter. 2
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