Description
From https://builds.apache.org/job/Hadoop-Yarn-trunk/514/console :
testRMWebAppRedirect(org.apache.hadoop.yarn.client.TestRMFailover) Time elapsed: 5.39 sec <<< ERROR!
java.lang.NullPointerException: null
at org.apache.hadoop.yarn.client.TestRMFailover.testRMWebAppRedirect(TestRMFailover.java:269)