somandal commented on code in PR #15617:
URL: https://github.com/apache/pinot/pull/15617#discussion_r2078477653


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/rebalance/TableRebalancer.java:
##########
@@ -224,6 +225,9 @@ private RebalanceResult doRebalance(TableConfig 
tableConfig, RebalanceConfig reb
     int minReplicasToKeepUpForNoDowntime = 
rebalanceConfig.getMinAvailableReplicas();
     boolean lowDiskMode = rebalanceConfig.isLowDiskMode();
     boolean bestEfforts = rebalanceConfig.isBestEfforts();
+    int batchSizePerServer = rebalanceConfig.getBatchSizePerServer();
+    Preconditions.checkState(batchSizePerServer != 0 && batchSizePerServer >= 
-1,
+        "TableRebalance batchSizePerServer must be > 0 or -1 to disable");

Review Comment:
   not, when we first enter the loop, the 
serverToNumSegmentsAddedSoFar.etOrDefault(server, 0) for the server will be 0. 
So we add at least 1 segment and the rebalance moves forward. I have tested 
with batchSizePerServer=1
   
   let me know if i misunderstood your question though



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