YARN-9565. RMAppImpl#ranNodes not cleared on FinalTransition. Contributed by Bilwa S T.

(cherry picked from commit 60c95e9b6a899e37ecdc8bce7bb6d9ed0dc7a6be)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java

@@ -1516,6 +1516,7 @@ public class RMAppImpl implements RMApp, Recoverable {
       if (app.finishTime == 0 ) {
         app.finishTime = app.systemClock.getTime();
       }
+      app.ranNodes.clear();
       // Recovered apps that are completed were not added to scheduler, so no
       // need to remove them from scheduler.
       if (app.recoveredFinalState == null) {

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java

@@ -66,6 +66,7 @@ import org.apache.hadoop.yarn.api.records.LocalResource;
 import org.apache.hadoop.yarn.api.records.LocalResourceType;
 import org.apache.hadoop.yarn.api.records.LocalResourceVisibility;
 import org.apache.hadoop.yarn.api.records.LogAggregationContext;
+import org.apache.hadoop.yarn.api.records.NodeId;
 import org.apache.hadoop.yarn.api.records.Priority;
 import org.apache.hadoop.yarn.api.records.ResourceRequest;
 import org.apache.hadoop.yarn.api.records.URL;
@@ -553,6 +554,7 @@ public class TestRMAppTransitions {
   protected RMApp testCreateAppAccepted(
       ApplicationSubmissionContext submissionContext) throws IOException {
     RMApp application = testCreateAppSubmittedNoRecovery(submissionContext);
+    NodeId nodeId = NodeId.newInstance("host", 1234);
     // SUBMITTED => ACCEPTED event RMAppEventType.APP_ACCEPTED
     RMAppEvent event = 
         new RMAppEvent(application.getApplicationId(), 
@@ -560,6 +562,8 @@ public class TestRMAppTransitions {
     application.handle(event);
     assertStartTimeSet(application);
     assertAppState(RMAppState.ACCEPTED, application);
+    application.handle(
+        new RMAppRunningOnNodeEvent(application.getApplicationId(), nodeId));
     return application;
   }
 
@@ -1059,6 +1063,7 @@ public class TestRMAppTransitions {
     rmDispatcher.await();
     assertTimesAtFinish(application);
     assertAppState(RMAppState.FINISHED, application);
+    Assert.assertEquals(0, application.getRanNodes().size());
     StringBuilder diag = application.getDiagnostics();
     Assert.assertEquals("application diagnostics is not correct",
         "", diag.toString());