What ever is available in your CDH distribution. If you're using parcels, take a look at /opt/cloudera/parcles/CDH/jars. If you're using packages, take a look at /usr/lib/kite. You can upload that jar to any directory in HDFS and make it available to your workflow by including it using the "file" element (https://oozie.apache.org/docs/4.0.0/WorkflowFunctionalSpec.html#a188.8.131.52_Adding_Files_and_Archives_for_the_Job). That would probably be the easiest way to test.
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