Jackie-Jiang commented on code in PR #15681:
URL: https://github.com/apache/pinot/pull/15681#discussion_r2069314466


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/relocation/SegmentRelocator.java:
##########
@@ -120,17 +121,23 @@ public SegmentRelocator(PinotHelixResourceManager 
pinotHelixResourceManager,
           LOGGER.warn("Got interrupted while rebalancing tables sequentially", 
e);
         }
       });
+      _tablesUndergoingRebalance = null;
     } else {
       _waitingTables = null;
       _waitingQueue = null;
+      _tablesUndergoingRebalance = ConcurrentHashMap.newKeySet();
     }
   }
 
   @Override
   protected void processTable(String tableNameWithType) {
     if (_waitingTables == null) {
-      LOGGER.debug("Rebalance table: {} immediately", tableNameWithType);
-      _executorService.submit(() -> rebalanceTable(tableNameWithType));
+      if (_tablesUndergoingRebalance == null || 
!_tablesUndergoingRebalance.contains(tableNameWithType)) {

Review Comment:
   I usually use `assert _tablesUndergoingRebalance != null;` to suppress the 
warning. It also works as a note to developers that it cannot be `null` when 
reached



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