zhengruifeng created SPARK-30457:
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Summary: Use PeriodicRDDCheckpointer instead of NodeIdCache
Key: SPARK-30457
URL: https://issues.apache.org/jira/browse/SPARK-30457
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 3.0.0
Reporter: zhengruifeng
Both PeriodicRDDCheckpointer and NodeIdCache are used in tree models:
PeriodicRDDCheckpointer is used in GBT to maintain prediction and errors,
NodeIdCache is used to maintain NodeIds.
The functionality of them are highly similar, and the update process of
NodeIdCache is simply. I guess we can delete NodeIdCache and use
PeriodicRDDCheckpointer instead.
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