HBASE-25875 RegionServer failed to start due to IllegalThreadStateException in AuthenticationTokenSecretManager.start

Author: pankaj72981

hbase-server/src/main/java/org/apache/hadoop/hbase/ipc/NettyRpcServer.java

@@ -130,8 +130,12 @@ public synchronized void start() {
     }
     authTokenSecretMgr = createSecretManager();
     if (authTokenSecretMgr != null) {
-      setSecretManager(authTokenSecretMgr);
-      authTokenSecretMgr.start();
+      // Start AuthenticationTokenSecretManager in synchronized way to avoid race conditions in
+      // LeaderElector start. See HBASE-25875
+      synchronized (authTokenSecretMgr) {
+        setSecretManager(authTokenSecretMgr);
+        authTokenSecretMgr.start();
+      }
     }
     this.authManager = new ServiceAuthorizationManager();
     HBasePolicyProvider.init(conf, authManager);