[YARN-7375] Possible NPE in RMWebapp when HA is enabled and the active RM fails

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0, 3.1.0
• Target Version/s: 2.9.0
• Hadoop Flags: Reviewed
• Assignee: Chandni Singh
• Reporter: Chandni Singh
• Created: 20/Oct/17 23:13
• Updated: 27/Oct/17 15:57
• Resolved: 27/Oct/17 15:57

Description

Caused by: java.lang.NullPointerException
at org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppInfo.<init>(AppInfo.java:327)
at org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.AppInfo.<init>(AppInfo.java:133)
at org.apache.hadoop.yarn.server.resourcemanager.webapp.RMAppAttemptBlock.createResourceRequestsTable(RMAppAttemptBlock.java:77)
at org.apache.hadoop.yarn.server.resourcemanager.webapp.RMAppAttemptBlock.createTablesForAttemptMetrics(RMAppAttemptBlock.java:280)
at org.apache.hadoop.yarn.server.webapp.AppAttemptBlock.render(AppAttemptBlock.java:153)
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.appattempt(RmController.java:58)

Steps:
1. RM HA is enabled
2. Started a service
3. Active RM failed.
4. Switched to the Web UI of Standby RM
5. Clicked to view the containers of the previous started application and landed to an error page.
6. The NPE mentioned above was found in the standby RM logs

Issue Links

• is related to: YARN-6871 Add additional deSelects params in RMWebServices#getAppReport