somandal commented on code in PR #15110:
URL: https://github.com/apache/pinot/pull/15110#discussion_r1985799022


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/assignment/instance/InstanceAssignmentDriver.java:
##########
@@ -55,40 +55,65 @@ public InstanceAssignmentDriver(TableConfig tableConfig) {
 
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
       List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions) {
+    return assignInstances(instancePartitionsType, instanceConfigs, 
existingInstancePartitions, (Boolean) null);
+  }
+
+  public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
+      List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
+      @Nullable Boolean minimizeDataMovement) {
     String tableNameWithType = _tableConfig.getTableName();
     InstanceAssignmentConfig assignmentConfig =
         
InstanceAssignmentConfigUtils.getInstanceAssignmentConfig(_tableConfig, 
instancePartitionsType);
     return getInstancePartitions(
         
instancePartitionsType.getInstancePartitionsName(TableNameBuilder.extractRawTableName(tableNameWithType)),
-        assignmentConfig, instanceConfigs, existingInstancePartitions, null);
+        assignmentConfig, instanceConfigs, existingInstancePartitions, null, 
minimizeDataMovement);
   }
 
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
       List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
       @Nullable InstancePartitions preConfiguredInstancePartitions) {
+    return assignInstances(instancePartitionsType, instanceConfigs, 
existingInstancePartitions,
+        preConfiguredInstancePartitions, null);
+  }
+
+  public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
+      List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
+      @Nullable InstancePartitions preConfiguredInstancePartitions, @Nullable 
Boolean minimizeDataMovement) {
     String tableNameWithType = _tableConfig.getTableName();
     InstanceAssignmentConfig assignmentConfig =
         
InstanceAssignmentConfigUtils.getInstanceAssignmentConfig(_tableConfig, 
instancePartitionsType);
     return getInstancePartitions(
         
instancePartitionsType.getInstancePartitionsName(TableNameBuilder.extractRawTableName(tableNameWithType)),
-        assignmentConfig, instanceConfigs, existingInstancePartitions, 
preConfiguredInstancePartitions);
+        assignmentConfig, instanceConfigs, existingInstancePartitions, 
preConfiguredInstancePartitions,
+        minimizeDataMovement);
   }
 
   public InstancePartitions assignInstances(String tierName, 
List<InstanceConfig> instanceConfigs,
       @Nullable InstancePartitions existingInstancePartitions, 
InstanceAssignmentConfig instanceAssignmentConfig) {
+    return assignInstances(tierName, instanceConfigs, 
existingInstancePartitions, instanceAssignmentConfig, null);
+  }
+
+  public InstancePartitions assignInstances(String tierName, 
List<InstanceConfig> instanceConfigs,
+      @Nullable InstancePartitions existingInstancePartitions, 
InstanceAssignmentConfig instanceAssignmentConfig,
+      @Nullable Boolean minimizeDataMovement) {
     return getInstancePartitions(
         
InstancePartitionsUtils.getInstancePartitionsNameForTier(_tableConfig.getTableName(),
 tierName),
-        instanceAssignmentConfig, instanceConfigs, existingInstancePartitions, 
null);
+        instanceAssignmentConfig, instanceConfigs, existingInstancePartitions, 
null, minimizeDataMovement);
   }
 
   private InstancePartitions getInstancePartitions(String 
instancePartitionsName,
       InstanceAssignmentConfig instanceAssignmentConfig, List<InstanceConfig> 
instanceConfigs,
       @Nullable InstancePartitions existingInstancePartitions,
-      @Nullable InstancePartitions preConfiguredInstancePartitions) {
+      @Nullable InstancePartitions preConfiguredInstancePartitions, @Nullable 
Boolean minimizeDataMovementFlag) {
     String tableNameWithType = _tableConfig.getTableName();
-    LOGGER.info("Starting {} instance assignment for table {}", 
instancePartitionsName, tableNameWithType);
 
-    boolean minimizeDataMovement = 
instanceAssignmentConfig.isMinimizeDataMovement();
+    // minimizeDataMovement might be set back to false within 
InstanceTagPoolSelector and InstancePartitionSelector
+    // if existingInstancePartitions is null.
+    boolean minimizeDataMovement =
+        minimizeDataMovementFlag == null ? 
instanceAssignmentConfig.isMinimizeDataMovement() : minimizeDataMovementFlag;
+    LOGGER.info("Starting {} instance assignment for table {}, 
instanceAssignmentConfig.isMinimizeDataMovement()={}, "
+            + "minimizeDataMovement={}", instancePartitionsName, 
tableNameWithType,

Review Comment:
   So this log might be looked at for debugging issues, so it should contain 
all the relevant information that we might need for that purpose. It should 
include the following:
   - Table config value
   - Boolean override value
   - value we set based on the above
   So my ask was to add all three, and for the Boolean, call it the "Override" 



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