Github user WeichenXu123 commented on the issue: https://github.com/apache/spark/pull/14333 @srowen I check `RDD.persist` referenced place: AFTSuvivalRegression, LinearRegression, LogisticRegression, will persist input training RDD and unpersist them when `train` return, seems OK. `recommend.ALS` persist many RDDs and seems unpersist them all OK. mllib `BisectingKMeans.run` contains a TODO "unpersist old indices", I'll check it now. Others seems OK. `Broadcast.persist` referenced place already checked in this PR I think they are all properly handled here.
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