zhengruifeng opened a new pull request #27145: [SPARK-30457][ML] Use PeriodicRDDCheckpointer instead of NodeIdCache URL: https://github.com/apache/spark/pull/27145 ### What changes were proposed in this pull request? 1, del `NodeIdCache`, and use `PeriodicRDDCheckpointer` instead; 2, reuse broadcasted `Splits` in the whole training; ### Why are the changes needed? 1, The functionality of `NodeIdCache` and `PeriodicRDDCheckpointer` are highly similar, and the update process of nodeIds is simple; 2, only need to broadcast `Splits` once; ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing testsuites
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