Raviston6296 commented on PR #60170:
URL: https://github.com/apache/spark/pull/60170#issuecomment-6685821389

   Thanks for tightening this. Since the description says the focused SBT run 
wasn't possible locally, I ran it on the PR head (f6254062261) with JDK 21:
   
   - `connect/testOnly org.apache.spark.sql.connect.ml.MLClassLoadingSuite`: 
4/4 pass.
   - With the SPARK-60608 check reverted (`MLAllowListedLoader.load` back to 
`Utils.classForName` in `DefaultParamsReader.loadParamsInstanceReader`), only 
`reject a non-allowlisted nested stage before invoking its reader` fails: 
`Expected exception ... MlUnsupportedException to be thrown, but no exception 
was thrown`. The other three still pass.
   
   That matches the description. With the old `DefaultParamsReadable` fixture, 
`DefaultParamsReader.load` calls `MLAllowListedLoader.load` itself, so it 
rejected the stage whether or not `loadParamsInstanceReader` did. The custom 
reader removes that second check, and `readCalls` pins that the rejection 
happens before `read` is invoked. LGTM.
   
   One note in case this goes to the maintenance branches: SPARK-60608 is on 
branch-4.0 through branch-4.x. On branch-4.0 the reject test intercepts 
`InvocationTargetException` and checks its cause (a335a9e723c), because 
branch-4.0's `MLUtils.loadOperator` does not unwrap it. So this change won't 
cherry-pick cleanly there. I'm happy to open the branch-4.0 backport if it's 
wanted.
   


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