w41ter commented on code in PR #38388:
URL: https://github.com/apache/doris/pull/38388#discussion_r1697833036


##########
gensrc/proto/cloud.proto:
##########
@@ -142,6 +142,7 @@ message NodeInfoPB {
         UNKNOWN = 0;
         FE_MASTER = 1;
         FE_OBSERVER = 2;
+        FE_FOLLOWER = 3;

Review Comment:
   How about changing `FE_MASTER` to `FE_FOLLOWER`, to make it more consistent 
with the local mode?



##########
fe/fe-core/src/main/java/org/apache/doris/cloud/system/CloudSystemInfoService.java:
##########
@@ -285,16 +285,24 @@ public synchronized void updateFrontends(List<Frontend> 
toAdd, List<Frontend> to
             if (masterIp.equals(fe.getHost())) {
                 continue;
             }
-            Env.getCurrentEnv().addFrontend(FrontendNodeType.OBSERVER,
-                    fe.getHost(), fe.getEditLogPort(), fe.getNodeName());
-            LOG.info("added cloud frontend={} ", fe);
+            try {
+                Env.getCurrentEnv().addFrontend(fe.getRole(),
+                        fe.getHost(), fe.getEditLogPort(), fe.getNodeName());
+                LOG.info("added cloud frontend={} ", fe);
+            } catch (DdlException e) {
+                LOG.warn("failed to add cloud frontend={} ", fe);
+            }
         }
         for (Frontend fe : toDel) {
             if (masterIp.equals(fe.getHost())) {
                 continue;
             }
-            Env.getCurrentEnv().dropFrontend(FrontendNodeType.OBSERVER, 
fe.getHost(), fe.getEditLogPort());
-            LOG.info("dropped cloud frontend={} ", fe);
+            try {
+                Env.getCurrentEnv().dropFrontend(fe.getRole(), fe.getHost(), 
fe.getEditLogPort());

Review Comment:
   Delete first and then add, otherwise the cluster surviving nodes may not be 
able to form a majority.



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