ConeyLiu edited a comment on pull request #29770:
URL: https://github.com/apache/spark/pull/29770#issuecomment-693374167


   > But what should we do with the following if(isYarnCluster) snippet in 
SparkSubmit.scala, copy-paste and change it to if(isMyYarnCluster)?
   
   The `childArgs ` is passed to start the cluster mode driver.  If a user want 
to use the `UserDefinedClusterManager` and with cluster mode, they should 
process the logic in the `Main.class` right? The current 
`ExternalClusterManager ` has no ability to process it.


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