kfaraz commented on code in PR #17776:
URL: https://github.com/apache/druid/pull/17776#discussion_r1982655892


##########
processing/src/main/java/org/apache/druid/guice/StartupInjectorBuilder.java:
##########
@@ -165,6 +166,48 @@ public void validate()
             docsLink
         );
       }
+
+      validateRemovedProcessingConfigs();
+    }
+
+    private void validateRemovedProcessingConfigs()
+    {
+      checkOldConfigAndThrow(
+          "druid.processing.merge.task.initialYieldNumRows",
+          "druid.processing.merge.initialYieldNumRows"
+      );
+      checkOldConfigAndThrow(
+          "druid.processing.merge.task.targetRunTimeMillis",
+          "druid.processing.merge.targetRunTimeMillis"
+      );
+      checkOldConfigAndThrow(
+          "druid.processing.merge.task.smallBatchNumRows",
+          "druid.processing.merge.smallBatchNumRows"
+      );
+
+      checkOldConfigAndThrow(
+          "druid.processing.merge.pool.awaitShutdownMillis",
+          "druid.processing.merge.awaitShutdownMillis"
+      );
+      checkOldConfigAndThrow(
+          "druid.processing.merge.pool.parallelism",
+          "druid.processing.merge.parallelism"
+      );
+      checkOldConfigAndThrow(
+          "druid.processing.merge.pool.defaultMaxQueryParallelism",
+          "druid.processing.merge.defaultMaxQueryParallelism"
+      );
+    }
+
+    private void checkOldConfigAndThrow(String oldPath, String newPath)
+    {
+      if (properties.getProperty(oldPath) != null) {
+        throw InvalidInput.exception(

Review Comment:
   Yeah, I was thinking the same. Updated the exception to ISE.



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