How to set up and configure Pentaho (Kettle, Pentaho Data Integration, Pentaho Business Analytics Suite) for your specific Hadoop distribution.

Pentaho supports different versions of Hadoop distributions from several vendors such as Cloudera, Hortonworks, and MapR. To support this many versions, Pentaho uses an abstraction layer, called a shim, that connects to the different Hadoop distributions. A shim is a small library that intercepts API calls and redirects or handles them, or changes the calling parameters. Periodically, Pentaho develops new shims as vendors develop new Hadoop distributions and versions. These big data shims are tested and certified by Pentaho engineers. The following steps will help you get Pentaho set up to work with your Hadoop cluster.

Pentaho provides Enterprise Edition support for distributions by Cloudera, Hortonworks and MapR. It is Pentaho's intention to support new distro's and versions by these vendors as soon as we can after release. This support is made available via monthly service packs.

Due to the rapid pace of development and frequency of releases on the part of the distro vendors, Pentaho can only test and fully support the last two major releases for each vendor. There is no reason that previous shims would stop working as new ones are released but we have to draw the line at 2.

Check for Pentaho Hadoop Distribution Support 

Our support matrix in our documentation lists the currently-supported Hadoop distributions.  Make sure that the Hadoop distribution you want to use is supported:

NOTE: Pentaho is pre-configured for Apache Hadoop 0.20.2. If you are using this distribution and version, no further configuration is required.

Note:  For instructions on preparing the shim to connect to a Kerberos cluster, see our Mindtouch documentation here:

Set Active Hadoop Distribution

These steps apply for the PDI and BA Servers as well as the Spoon, Report Designer, and Metadata Editor design tools.

Specify which Hadoop Distribution (shim) you want to make active. You must do this for each Pentaho application that needs access to the Hadoop cluster. Only one Hadoop distribution can be active at a time; so each time you change the distributions or version, you will need to reset the active Hadoop distribution.

  1. Stop the application (e.g. Spoon, DI Server, Report Design, BA Server, Metadata Editor) if it is running.
  2. Navigate to the pentaho-big-data-plugin folder. This folder is different for each application and located:
  3. Edit the file.
  4. Set the active.hadoop.configuration property to match the name of the shim you want to make active. For example, if the name of the shim is cdh42, then the code would look like this: active.hadoop.configuation=cdh42.
  5. Save and close the file.

YARN shims require additional configuration.  See Additional Configuration for YARN Shims for more detail. 

MapR users need to do further configuration as described in Additional Configuration for MapR Shims.

CDH 5 users who want to configure CDH 5 to use MapReduce 1 instead of MapReduce 2, follow the instructions in Additional Configuration for using MR1 with CDH5.

Future Release Roadmap

Support for the following Hadoop Configurations are planned for an upcoming patch or future release.

Next Steps

Now that you've configured Pentaho for your Hadoop distribution, there are many things you can do.  Here are a few links to get you started!

Want to switch gears and read something a little different? Check out these articles on the evolution of Hadoop.