Confirmed.  This was the issue.  Closing the firewall to port 8088 from outside traffic kept this from happening again, along with removing the rogue cron entry in the yarn user's crontab file, and killing those yarn processes.   Chris ... View more

Just one last reply to confirm that an improper switch configuration was the issue here.  Once that was fixed, everything worked great!   Thanks again for all the help. Chris ... View more