somandal commented on code in PR #16136:
URL: https://github.com/apache/pinot/pull/16136#discussion_r2155735432


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/tenant/TenantRebalanceResult.java:
##########
@@ -65,4 +215,449 @@ public void setJobId(String jobId) {
   public void setRebalanceTableResults(Map<String, RebalanceResult> 
rebalanceTableResults) {
     _rebalanceTableResults = rebalanceTableResults;
   }
+
+  /**
+   * Aggregated pre-check result that provides table-level pre-check status 
counts and message mappings
+   */
+  @JsonInclude(JsonInclude.Include.NON_NULL)
+  public static class AggregatedPrecheckResult {
+    private final int _tablesPassedCount;
+    private final int _tablesWarnedCount;
+    private final int _tablesErroredCount;
+    private final Map<String, String> _passedTables;
+    private final Map<String, String> _warnedTables;
+    private final Map<String, String> _erroredTables;
+
+    public AggregatedPrecheckResult(int tablesPassedCount, int 
tablesWarnedCount, int tablesErroredCount,
+        Map<String, String> passedTables, Map<String, String> warnedTables,
+        Map<String, String> erroredTables) {
+      _tablesPassedCount = tablesPassedCount;
+      _tablesWarnedCount = tablesWarnedCount;
+      _tablesErroredCount = tablesErroredCount;
+      _passedTables = passedTables;
+      _warnedTables = warnedTables;
+      _erroredTables = erroredTables;
+    }
+
+    @JsonProperty
+    public int getTablesPassedCount() {
+      return _tablesPassedCount;
+    }
+
+    @JsonProperty
+    public int getTablesWarnedCount() {
+      return _tablesWarnedCount;
+    }
+
+    @JsonProperty
+    public int getTablesErroredCount() {
+      return _tablesErroredCount;
+    }
+
+    @JsonProperty
+    public Map<String, String> getPassedTables() {
+      return _passedTables;
+    }
+
+    @JsonProperty
+    public Map<String, String> getWarnedTables() {
+      return _warnedTables;
+    }
+
+    @JsonProperty
+    public Map<String, String> getErroredTables() {
+      return _erroredTables;
+    }
+  }
+
+  /**
+   * Step 1: Aggregate ServerSegmentChangeInfo across all tables for each 
server
+   */
+  private static Map<String, AggregatedServerSegmentChangeInfo> 
aggregateServerSegmentChangeInfo(
+      List<RebalanceSummaryResult> summaryResults) {
+    Map<String, AggregatedServerSegmentChangeInfo> serverAggregates = new 
HashMap<>();
+
+    for (RebalanceSummaryResult summary : summaryResults) {
+      if (summary.getServerInfo() != null && 
summary.getServerInfo().getServerSegmentChangeInfo() != null) {
+        for (Map.Entry<String, RebalanceSummaryResult.ServerSegmentChangeInfo> 
entry : summary.getServerInfo()
+            .getServerSegmentChangeInfo()
+            .entrySet()) {
+          String serverName = entry.getKey();
+          RebalanceSummaryResult.ServerSegmentChangeInfo changeInfo = 
entry.getValue();
+
+          serverAggregates.computeIfAbsent(serverName, k -> new 
AggregatedServerSegmentChangeInfo())
+              .merge(changeInfo);
+        }
+      }
+    }
+
+    return serverAggregates;
+  }
+
+  /**
+   * Helper class to aggregate ServerSegmentChangeInfo across multiple tables
+   */
+  private static class AggregatedServerSegmentChangeInfo extends 
RebalanceSummaryResult.ServerSegmentChangeInfo {
+
+    AggregatedServerSegmentChangeInfo() {
+      super(RebalanceSummaryResult.ServerStatus.UNCHANGED, 0, 0, 0, 0, 0, 
null);
+    }
+
+    void merge(RebalanceSummaryResult.ServerSegmentChangeInfo changeInfo) {
+      _totalSegmentsAfterRebalance += 
changeInfo.getTotalSegmentsAfterRebalance();
+      _totalSegmentsBeforeRebalance += 
changeInfo.getTotalSegmentsBeforeRebalance();
+      _segmentsAdded += changeInfo.getSegmentsAdded();
+      _segmentsDeleted += changeInfo.getSegmentsDeleted();
+      _segmentsUnchanged += changeInfo.getSegmentsUnchanged();
+
+      // Use tag list from any of the change infos (should be consistent)
+      if (_tagList == null && changeInfo.getTagList() != null) {
+        _tagList = changeInfo.getTagList();
+      }

Review Comment:
   but can't different servers belong to different tenants? 
   like Server1 belongs to tag1, tag2, tag3
   Server2 belongs to tag1, tag5, tag6?



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