YARN-11447 A bug occurs during the active/standby switchover of RM, causing RM to work abnormally

Author: zhangxiping1

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

@@ -1225,6 +1225,8 @@ public void run() {
         } catch (Exception e) {
           LOG.error(FATAL, "Failed to transition RM to Standby mode.", e);
           ExitUtil.terminate(1, e);
+        } finally {
+          hasAlreadyRun.set(false);
         }
       }
     }