[YARN-7120] CapacitySchedulerPage NPE in "Aggregate scheduler counts" section

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.9.0, 2.8.1, 3.0.0-alpha3
• Fix Version/s: 2.9.0, 3.0.0-beta1, 2.8.3
• Hadoop Flags: Reviewed
• Assignee: Eric Payne
• Reporter: Eric Payne
• Created: 29/Aug/17 17:31
• Updated: 01/Sep/17 16:27
• Resolved: 01/Sep/17 16:12

Description

The problem manifests itself by having the bottom part of the "Aggregated scheduler counts" section cut off on the GUI and an NPE in the RM log.

Caused by: java.lang.NullPointerException
	at org.apache.hadoop.yarn.server.resourcemanager.webapp.CapacitySchedulerPage$HealthBlock.render(CapacitySchedulerPage.java:558)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
	at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock$Block.subView(HtmlBlock.java:43)
	at org.apache.hadoop.yarn.webapp.hamlet2.Hamlet.__(Hamlet.java:30354)
	at org.apache.hadoop.yarn.server.resourcemanager.webapp.CapacitySchedulerPage$QueuesBlock.render(CapacitySchedulerPage.java:478)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:69)
	at org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:79)
	at org.apache.hadoop.yarn.webapp.View.render(View.java:235)
	at org.apache.hadoop.yarn.webapp.view.HtmlPage$Page.subView(HtmlPage.java:49)
	at org.apache.hadoop.yarn.webapp.hamlet2.HamletImpl$EImp._v(HamletImpl.java:117)
	at org.apache.hadoop.yarn.webapp.hamlet2.Hamlet$TD.__(Hamlet.java:848)
	at org.apache.hadoop.yarn.webapp.view.TwoColumnLayout.render(TwoColumnLayout.java:71)
	at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:82)
	at org.apache.hadoop.yarn.webapp.Controller.render(Controller.java:212)
	at org.apache.hadoop.yarn.server.resourcemanager.webapp.RmController.scheduler(RmController.java:86)
	... 58 more