zhengruifeng opened a new pull request #27189: [SPARK-30502][ML][CORE][GRAPHX] 
PeriodicRDDCheckpointer & PeriodicGraphCheckpointer support storageLevel
URL: https://github.com/apache/spark/pull/27189
   ### What changes were proposed in this pull request?
   1, add field `storageLevel` in `PeriodicRDDCheckpointer` & 
   2, for ml.GBT/ml.RF/ml.LDA set storageLevel=`StorageLevel.MEMORY_AND_DISK`
   ### Why are the changes needed?
   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
     2. If you fix a bug, you can clarify why it is a bug.
   ### Does this PR introduce any user-facing change?
   Intermediate RDDs in ML are cached with 
   PeriodicRDDCheckpointer & PeriodicGraphCheckpointer now store RDD with 
storageLevel=StorageLevel.MEMORY_ONLY, it maybe nice to set the storageLevel of 
   ### How was this patch tested?
   existing testsuites

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