 <p>No, CDH4 is not meant mainly for YARN. CDH5, on the other hand, will be.</p> <p>I'm not sure how you went about setting up your CDH cluster, but it's rather easy to add the MapReducev1 service, as opposed to YARN, using Cloudera Manager.</p> <p>Very few companies use YARN in production, Yahoo being the most notable.</p> <p>CDH4 is not YARN-centric. Cloudera includes YARN so people can have the most recent Hadoop bits accessible to them - but it's very clear on Cloudera's website that they do not recommend YARN for production.</p> <p>One of the big things that CDH4 brought to the table last year was HDFSv2, and they made MRv1 compatible with it.</p> <p>To install CDH4 with MRv1, see <a href="http://www.cloudera.com/content/cloudera-content/cloudera-docs/CDH4/4.2.0/CDH4-Installation-Guide/cdh4ig_topic_11_3.html?scroll=topic_11_3" rel="nofollow">here</a>.</p>