K0K0V0K opened a new pull request, #6569:
URL: https://github.com/apache/hadoop/pull/6569

   ### Description of PR
   
   Created a MultiDispatcher class which implements the Dispatcher interface.
   The dispatcher replace the AsyncDispatcher in the RMStateStore.
   The Dispatcher creates a separate metric object called Event metrics for 
"rm-state-store" where we can see
   
   - how many unhandled events are currently present in the event queue for the 
specific event type
   - how many events were handled for the specific event type
   - average execution time for the specific event
   
   ### How was this patch tested?
   
   - Unit test
   - Deployed cluster and load test with PI example job with the following 
implementations
   - - FileSystemRMStateStore
   - - LeveldbRMStateStore
   - - ZKRMStateStore
   - Check RM stop - start can't corrupt RM
   


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