[YARN-9644] First RMContext object is always leaked during switch over

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 3.3.0, 3.2.1, 3.1.3
• Labels: memory-leak
• Hadoop Flags: Reviewed
• Assignee: Bibin Chundatt
• Reporter: Bibin Chundatt
• Created: 22/Jun/19 10:59
• Updated: 30/Jul/19 18:36
• Resolved: 04/Jul/19 05:37

Description

As per my understanding following 2 issues causes the issue.

• WebApp holds the reference to First applicationMasterServer instance, which has rmcontext with ActiveServiceContext (holds RMApps + nodes map). WebApp remains to life time of RM process.
• On transistion to active RMNMInfo object is registered in  MBean and never unregistered on transitionToStandBy

On transistion to Standby and again based to active new RMContext gets created, but above 2 issues causes first RMcontext persist still RMShutdown.