[YARN-8760] [AMRMProxy] Fix concurrent re-register due to YarnRM failover in AMRMClientRelayer

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.0
• Assignee: Botong Huang
• Reporter: Botong Huang
• Created: 10/Sep/18 18:47
• Updated: 01/Oct/18 22:10
• Resolved: 01/Oct/18 20:13

Description

When home YarnRM is failing over, FinishApplicationMaster call from AM can have multiple retry threads outstanding in FederationInterceptor. When new YarnRM come back up, all retry threads will re-register to YarnRM. The first one will succeed but the rest will get "Application Master is already registered" exception. We should catch and swallow this exception and move on.