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` & `PeriodicGraphCheckpointer` 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 storageLevel=StorageLevel.MEMORY_AND_DISK. PeriodicRDDCheckpointer & PeriodicGraphCheckpointer now store RDD with storageLevel=StorageLevel.MEMORY_ONLY, it maybe nice to set the storageLevel of checkpointer. ### How was this patch tested? existing testsuites
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