Author: Mufeed Usman
Original Publication Date: March 31, 2015
If as part of securing your environment, you've a policy of restricting application port usage to a specific range, you could very well have that in place for AM in YARN context. As not having this in place will limit your visibility into active job progress/status even though the job successfully completes.
For the above have the following entry added to mapred-site.xml on all the nodes.
Followed by a Warden restart on all the nodes.