lei-xia commented on a change in pull request #1129:
URL: https://github.com/apache/helix/pull/1129#discussion_r455893415



##########
File path: 
helix-core/src/main/java/org/apache/helix/manager/zk/ParticipantManager.java
##########
@@ -187,26 +187,31 @@ private void joinCluster() {
       LOG.info("auto registration is false for cluster" + _clusterName);
     }
 
+    InstanceConfig instanceConfig;
     if (!ZKUtil.isInstanceSetup(_zkclient, _clusterName, _instanceName, 
_instanceType)) {
       if (!autoJoin) {
         throw new HelixException("Initial cluster structure is not set up for 
instance: "
             + _instanceName + ", instanceType: " + _instanceType);
+      }
+      if (!autoRegistration) {
+        LOG.info(_instanceName + " is auto-joining cluster: " + _clusterName);
+        instanceConfig = HelixUtil.composeInstanceConfig(_instanceName);
       } else {
-        if (!autoRegistration) {
-          LOG.info(_instanceName + " is auto-joining cluster: " + 
_clusterName);
-          _helixAdmin.addInstance(_clusterName, 
HelixUtil.composeInstanceConfig(_instanceName));
-        } else {
-          LOG.info(_instanceName + " is auto-registering cluster: " + 
_clusterName);
-          CloudInstanceInformation cloudInstanceInformation = 
getCloudInstanceInformation();
-          String domain = cloudInstanceInformation
-              
.get(CloudInstanceInformation.CloudInstanceField.FAULT_DOMAIN.name()) + 
_instanceName;
-
-          InstanceConfig instanceConfig = 
HelixUtil.composeInstanceConfig(_instanceName);
-          instanceConfig.setDomain(domain);
-          _helixAdmin.addInstance(_clusterName, instanceConfig);
-        }
+        LOG.info(_instanceName + " is auto-registering cluster: " + 
_clusterName);
+        CloudInstanceInformation cloudInstanceInformation = 
getCloudInstanceInformation();
+        String domain = cloudInstanceInformation
+            
.get(CloudInstanceInformation.CloudInstanceField.FAULT_DOMAIN.name()) + 
_instanceName;
+        instanceConfig = HelixUtil.composeInstanceConfig(_instanceName);
+        instanceConfig.setDomain(domain);
       }
+      _helixAdmin.addInstance(_clusterName, instanceConfig);
+    } else {
+      ConfigAccessor.validateTopologySettingInInstanceConfig(
+          _configAccessor.getClusterConfig(_clusterName), _instanceName,
+          _configAccessor.getInstanceConfig(_clusterName,_instanceName));

Review comment:
       Should this check before line 207?




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