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These abilities allow you to quickly develop Map Reduce applications that use the HDFS-stored records in your processing pipeline.You are also free to parse the delimiteds record data yourself, using any other tools you prefer.
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When using Sqoop, the command line options that do not change from invocation to invocation can be put in an options file for convenience.
An options file is a text file where each line identifies an option in the order that it appears otherwise on the command line.
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Subsequent sections of this document explain how to specify these and other arguments to Sqoop. To use Sqoop, you specify the tool you want to use and the arguments that control the tool.
If Sqoop is compiled from its own source, you can run Sqoop without a formal installation process by running the $ sqoop help usage: sqoop COMMAND [ARGS] Available commands: codegen Generate code to interact with database records create-hive-table Import a table definition into Hive eval Evaluate a SQL statement and display the results export Export an HDFS directory to a database table help List available commands import Import a table from a database to HDFS import-all-tables Import tables from a database to HDFS list-databases List available databases on a server list-tables List available tables in a database version Display version information See 'sqoop help COMMAND' for information on a specific command.
You can use Sqoop to import data from a relational database management system (RDBMS) such as My SQL or Oracle into the Hadoop Distributed File System (HDFS), transform the data in Hadoop Map Reduce, and then export the data back into an RDBMS.
Sqoop automates most of this process, relying on the database to describe the schema for the data to be imported.
Option files allow specifying a single option on multiple lines by using the back-slash character at the end of intermediate lines.