Misleading warning: java.lang.IllegalArgumentException: Does not contain a valid host:port authority: yarnRM

2019-06-17 05:30:19,335 WARN org.apache.oozie.action.hadoop.HadoopTokenHelper: SERVER[nightly6x-1.vpc.cloudera.com] USER[admin] GROUP[-] TOKEN[] APP[Batch job for PySpark Pi Estimator Job] JOB[0000001-190617003335655-oozie-oozi-W] ACTION[0000001-190617003335655-oozie-oozi-W@spark2-3833] An error happened while trying to get server principal. Getting it from service principal anyway.
java.lang.IllegalArgumentException: Does not contain a valid host:port authority: yarnRM
	at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:213)
	at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:164)
	at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:153)
	at org.apache.oozie.action.hadoop.HadoopTokenHelper.getServerPrincipal(HadoopTokenHelper.java:73)
	at org.apache.oozie.action.hadoop.HadoopTokenHelper.getServerPrincipal(HadoopTokenHelper.java:51)
	at org.apache.oozie.action.hadoop.YarnRMCredentials.updateCredentials(YarnRMCredentials.java:55)
	at org.apache.oozie.action.hadoop.JavaActionExecutor.setCredentialTokens(JavaActionExecutor.java:1503)
	at org.apache.oozie.action.hadoop.JavaActionExecutor.submitLauncher(JavaActionExecutor.java:1053)
	at org.apache.oozie.action.hadoop.JavaActionExecutor.start(JavaActionExecutor.java:1601)
	at org.apache.oozie.command.wf.ActionStartXCommand.execute(ActionStartXCommand.java:243)
	at org.apache.oozie.command.wf.ActionStartXCommand.execute(ActionStartXCommand.java:68)
	at org.apache.oozie.command.XCommand.call(XCommand.java:291)
	at org.apache.oozie.service.CallableQueueService$CompositeCallable.call(CallableQueueService.java:363)
	at org.apache.oozie.service.CallableQueueService$CompositeCallable.call(CallableQueueService.java:292)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at org.apache.oozie.service.CallableQueueService$CallableWrapper.run(CallableQueueService.java:210)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)