J-HowHuang commented on code in PR #15110:
URL: https://github.com/apache/pinot/pull/15110#discussion_r1968443719


##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/assignment/instance/InstanceAssignmentDriver.java:
##########
@@ -54,41 +54,44 @@ public InstanceAssignmentDriver(TableConfig tableConfig) {
   }
 
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
-      List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions) {
+      List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
+      boolean forceMinimizeDataMovement) {
     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, 
forceMinimizeDataMovement);
   }
 
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
       List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
-      @Nullable InstancePartitions preConfiguredInstancePartitions) {
+      @Nullable InstancePartitions preConfiguredInstancePartitions, boolean 
forceMinimizeDataMovement) {
     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,
+        forceMinimizeDataMovement);
   }
 
   public InstancePartitions assignInstances(String tierName, 
List<InstanceConfig> instanceConfigs,
-      @Nullable InstancePartitions existingInstancePartitions, 
InstanceAssignmentConfig instanceAssignmentConfig) {
+      @Nullable InstancePartitions existingInstancePartitions, 
InstanceAssignmentConfig instanceAssignmentConfig,
+      boolean forceMinimizeDataMovement) {
     return getInstancePartitions(
         
InstancePartitionsUtils.getInstancePartitionsNameForTier(_tableConfig.getTableName(),
 tierName),
-        instanceAssignmentConfig, instanceConfigs, existingInstancePartitions, 
null);
+        instanceAssignmentConfig, instanceConfigs, existingInstancePartitions, 
null, forceMinimizeDataMovement);
   }
 
   private InstancePartitions getInstancePartitions(String 
instancePartitionsName,
       InstanceAssignmentConfig instanceAssignmentConfig, List<InstanceConfig> 
instanceConfigs,
       @Nullable InstancePartitions existingInstancePartitions,
-      @Nullable InstancePartitions preConfiguredInstancePartitions) {
+      @Nullable InstancePartitions preConfiguredInstancePartitions, boolean 
forceMinimizeDataMovement) {
     String tableNameWithType = _tableConfig.getTableName();
     LOGGER.info("Starting {} instance assignment for table {}", 
instancePartitionsName, tableNameWithType);
 
-    boolean minimizeDataMovement = 
instanceAssignmentConfig.isMinimizeDataMovement();
+    boolean minimizeDataMovement = forceMinimizeDataMovement || 
instanceAssignmentConfig.isMinimizeDataMovement();

Review Comment:
   I think in `InstanceAssignmentConfigUtils::getInstanceAssignmentConfig` it 
handles the case when instance config is not set (this covers cases when 
`allowInstanceAssignment` is false) by falling back to look at the 
`minimizeDataMovement` flag in segment validation config. 
   Can we safely assume that 
`InstanceAssignmentConfigUtils::getInstanceAssignmentConfig` is always called 
when making `InstanceAssignmentConfig` instances?



##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/assignment/instance/InstanceAssignmentDriver.java:
##########
@@ -54,41 +54,44 @@ public InstanceAssignmentDriver(TableConfig tableConfig) {
   }
 
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
-      List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions) {
+      List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
+      boolean forceMinimizeDataMovement) {
     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, 
forceMinimizeDataMovement);
   }
 
   public InstancePartitions assignInstances(InstancePartitionsType 
instancePartitionsType,
       List<InstanceConfig> instanceConfigs, @Nullable InstancePartitions 
existingInstancePartitions,
-      @Nullable InstancePartitions preConfiguredInstancePartitions) {
+      @Nullable InstancePartitions preConfiguredInstancePartitions, boolean 
forceMinimizeDataMovement) {
     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,
+        forceMinimizeDataMovement);
   }
 
   public InstancePartitions assignInstances(String tierName, 
List<InstanceConfig> instanceConfigs,
-      @Nullable InstancePartitions existingInstancePartitions, 
InstanceAssignmentConfig instanceAssignmentConfig) {
+      @Nullable InstancePartitions existingInstancePartitions, 
InstanceAssignmentConfig instanceAssignmentConfig,
+      boolean forceMinimizeDataMovement) {
     return getInstancePartitions(
         
InstancePartitionsUtils.getInstancePartitionsNameForTier(_tableConfig.getTableName(),
 tierName),
-        instanceAssignmentConfig, instanceConfigs, existingInstancePartitions, 
null);
+        instanceAssignmentConfig, instanceConfigs, existingInstancePartitions, 
null, forceMinimizeDataMovement);
   }
 
   private InstancePartitions getInstancePartitions(String 
instancePartitionsName,
       InstanceAssignmentConfig instanceAssignmentConfig, List<InstanceConfig> 
instanceConfigs,
       @Nullable InstancePartitions existingInstancePartitions,
-      @Nullable InstancePartitions preConfiguredInstancePartitions) {
+      @Nullable InstancePartitions preConfiguredInstancePartitions, boolean 
forceMinimizeDataMovement) {
     String tableNameWithType = _tableConfig.getTableName();
     LOGGER.info("Starting {} instance assignment for table {}", 
instancePartitionsName, tableNameWithType);
 
-    boolean minimizeDataMovement = 
instanceAssignmentConfig.isMinimizeDataMovement();
+    boolean minimizeDataMovement = forceMinimizeDataMovement || 
instanceAssignmentConfig.isMinimizeDataMovement();

Review Comment:
   I think in `InstanceAssignmentConfigUtils::getInstanceAssignmentConfig` it 
handles the case when instance config is not set (this covers cases when 
`allowInstanceAssignment` is false) by falling back to look at the 
`minimizeDataMovement` flag in segment validation config. 
   
   Can we safely assume that 
`InstanceAssignmentConfigUtils::getInstanceAssignmentConfig` is always called 
when making `InstanceAssignmentConfig` instances?



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