J-HowHuang commented on code in PR #15284:
URL: https://github.com/apache/pinot/pull/15284#discussion_r2019090910


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pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/TableRebalancer.java:
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@@ -662,6 +663,29 @@ private RebalanceSummaryResult 
calculateDryRunSummary(Map<String, Map<String, St
     Set<String> serversRemoved = new HashSet<>();
     Set<String> serversUnchanged = new HashSet<>();
     Set<String> serversGettingNewSegments = new HashSet<>();
+    Map<String, RebalanceSummaryResult.TagInfo> tagsInfoMap = new HashMap<>();
+    String serverTenantName = tableConfig.getTenantConfig().getServer();
+    if (serverTenantName != null) {
+      String serverTenantTag =
+          TagNameUtils.getServerTagForTenant(serverTenantName, 
tableConfig.getTableType());
+      tagsInfoMap.put(serverTenantTag,
+          new RebalanceSummaryResult.TagInfo(serverTenantTag));
+    }
+    if (tableConfig.getInstanceAssignmentConfigMap() != null) {
+      // for simplicity, including all segment types present in 
instanceAssignmentConfigMap
+      
tableConfig.getInstanceAssignmentConfigMap().values().forEach(instanceAssignmentConfig
 -> {
+        if (instanceAssignmentConfig.getTagPoolConfig().isPoolBased()) {

Review Comment:
   If `poolBase` is set to false, would the pool tag still be used to assign 
instance? If so, do you want to include that just for showing the information 
of the tag having 0 segment added and 0 server participating with it?



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