...

1. Unzip pentaho-mapreduce-libraries.zip, it contains a single lib/ directory with the required Kettle dependencies
2. Add Copy additional libraries to the lib/ directory
3. Zip up the lib/ directory into pentaho-mapreduce-libraries-custom.zip so the archive contains the lib/ with all jars within it (you may create subdirectories within lib/. All jars found in lib/ and its subdirectories will be added to the classpath of the executing job.)
4. Update pentaho-mapreduce.properties and update the following properties:

   Code Block
   pmr.kettle.installation.id=custom pmr.libraries.archive.file=pentaho-mapreduce-libraries-custom.zip

...

1. Remove the pentaho.* properties from your mapred-site.xml
2. Remove the directories those properties referenced
3. Restart the TaskTracker process

Appendix A: pentaho-mapreduce-libraries.zip structure:

pentaho-mapreduce-libraries.zip/
  +- lib/
      +- kettle-core-{version}.jar
      +- kettle-engine-{version}.jar
      ..