Configure PDI for Hadoop connections

Within PDI, a Hadoop configuration is the collection of Hadoop libraries required to communicate with a specific version of Hadoop and related tools, such as Hive, HBase, or Sqoop.

Hadoop configurations are defined in the plugin.properties file and are designed to be easily configured within PDI by changing the active hadoop.configuration property. The plugin.properties file resides in the pentaho-big-data-plugin/ folder.

All Hadoop configurations share a basic structure. Elements of the structure are defined following the code sample:

configuration/
|-- lib/
|--  |-- pmr/
|--  '-- *.jar
|-- config.properties
|-- core-site.xml
`-- configuration-implementation.jar

Configuration Element	Definition
lib/	Libraries specific to the version of Hadoop with which this configuration was created to communicate.
pmr/	Jar files that contain libraries required for parsing data in input/output formats or otherwise outside of any PDI-based execution.
*.jar	All other libraries required for Hadoop configuration that are not client-only or special PMR JAR files that need to be available to the entire JVM of Hadoop job tasks.
config.properties	Contains metadata and configuration options for this Hadoop configuration. It provides a way to define a configuration name, additional classpath, and native libraries that the configuration requires. See the comments in this file for more details.
core-site.xml	Configuration file that can be replaced to set a site-specific configuration. For example, hdfs-site.xml would be used to configure HDFS.
configuration-implementation.jar	File that must be replaced to communicate with this configuration.