Github user WeichenXu123 commented on the issue: https://github.com/apache/spark/pull/16774 @BryanCutler You are right. Once `Future` complete the model can be cleaned by GC. So the memory cost of the code has been optimized already. I didn't look at the code carefully a few days ago. Thanks for your careful work for this. I will take a deeper look later. ^_^
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