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https://issues.apache.org/jira/browse/SPARK-28866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-28866.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 25576
[https://github.com/apache/spark/pull/25576]
> Persist item factors RDD when checkpointing in ALS
> --------------------------------------------------
>
> Key: SPARK-28866
> URL: https://issues.apache.org/jira/browse/SPARK-28866
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 3.0.0
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Priority: Minor
> Fix For: 3.0.0
>
>
> In ALS ML implementation, if `implicitPrefs` is false, we checkpoint the RDD
> of item factors, between intervals. Before checkpointing and materializing
> RDD, this RDD was not persisted. It causes recomputation. In an experiment,
> there is performance difference between persisting and no persisting before
> checkpointing the RDD.
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