klsince commented on code in PR #15266:
URL: https://github.com/apache/pinot/pull/15266#discussion_r2033692672


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/ZkBasedTableRebalanceObserver.java:
##########
@@ -284,4 +319,255 @@ public static 
TableRebalanceProgressStats.RebalanceStateStats getDifferenceBetwe
         (totalSegments == 0) ? 0 : ((double) 
rebalanceStats._segmentsToRebalance / totalSegments) * 100.0;
     return rebalanceStats;
   }
+
+  /**
+   * Calculates the progress stats for the given step or for the overall based 
on the trigger type
+   * @param targetAssignment target assignment (either updated IS or the 
target end IS depending on the step)
+   * @param currentAssignment current assignment (either EV or the current IS 
depending on the step)
+   * @param rebalanceContext rebalance context
+   * @param trigger reason to trigger the stats update
+   * @param rebalanceProgressStats current value of the rebalance progress 
stats, used to calculate the next
+   * @return the calculated step or progress stats
+   */
+  @VisibleForTesting
+  static TableRebalanceProgressStats.RebalanceProgressStats 
calculateUpdatedProgressStats(
+      Map<String, Map<String, String>> targetAssignment, Map<String, 
Map<String, String>> currentAssignment,
+      RebalanceContext rebalanceContext, Trigger trigger, 
TableRebalanceProgressStats rebalanceProgressStats) {
+    Map<String, Set<String>> existingServersToSegmentMap = new HashMap<>();
+    Map<String, Set<String>> newServersToSegmentMap = new HashMap<>();
+    Map<String, Set<String>> targetInstanceToOfflineSegmentsMap = new 
HashMap<>();
+    Set<String> newSegmentsNotExistingBefore = new HashSet<>();
+
+    // Segments to monitor is the list of segments that are being moved as 
part of the table rebalance that the
+    // table rebalance intends to track convergence for. This list usually 
includes segments from the last next

Review Comment:
   typo? "... from the last next ..."



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