ignore read kafka-controller data when znode not exist

kafka-manager-core/src/main/java/com/xiaojukeji/kafka/manager/service/zookeeper/ControllerStateListener.java

@@ -19,13 +19,13 @@ import org.springframework.dao.DuplicateKeyException;
  * @date 20/5/14
  */
 public class ControllerStateListener implements StateChangeListener {
-    private final static Logger LOGGER = LoggerFactory.getLogger(ControllerStateListener.class);
+    private static final Logger LOGGER = LoggerFactory.getLogger(ControllerStateListener.class);
 
-    private Long clusterId;
+    private final Long clusterId;
 
-    private ZkConfigImpl zkConfig;
+    private final ZkConfigImpl zkConfig;
 
-    private ControllerDao controllerDao;
+    private final ControllerDao controllerDao;
 
     public ControllerStateListener(Long clusterId, ZkConfigImpl zkConfig, ControllerDao controllerDao) {
         this.clusterId = clusterId;
@@ -35,9 +35,12 @@ public class ControllerStateListener implements StateChangeListener {
 
     @Override
     public void init() {
-        processControllerChange();
+        if (!checkNodeExist()) {
+            LOGGER.warn("kafka-controller data not exist, clusterId:{}.", clusterId);
             return;
         }
+        processControllerChange();
+    }
 
     @Override
     public void onChange(State state, String path) {
@@ -49,12 +52,21 @@ public class ControllerStateListener implements StateChangeListener {
                     break;
             }
         } catch (Exception e) {
-            LOGGER.error("process controller state change failed, clusterId:{} state:{} path:{}.",
-                    clusterId, state, path, e);
+            LOGGER.error("process controller state change failed, clusterId:{} state:{} path:{}.", clusterId, state, path, e);
         }
     }
 
-    private void processControllerChange(){
+    private boolean checkNodeExist() {
+        try {
+            return zkConfig.checkPathExists(ZkPathUtil.CONTROLLER_ROOT_NODE);
+        } catch (Exception e) {
+            LOGGER.error("init kafka-controller data failed, clusterId:{}.", clusterId, e);
+        }
+
+        return false;
+    }
+
+    private void processControllerChange() {
         LOGGER.warn("init controllerData or controller change, clusterId:{}.", clusterId);
         ControllerData controllerData = null;
         try {