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https://issues.apache.org/jira/browse/SPARK-29826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen resolved SPARK-29826.
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Resolution: Duplicate
> Missing persist on data in mllib.feature.ChiSqSelector.fit
> ----------------------------------------------------------
>
> Key: SPARK-29826
> URL: https://issues.apache.org/jira/browse/SPARK-29826
> Project: Spark
> Issue Type: Sub-task
> Components: MLlib
> Affects Versions: 2.4.3
> Reporter: Dong Wang
> Priority: Major
>
> The rdd data in mllib.feature.ChiSqSelector.fit() is used by an action in
> Statistics.chiSqTest(data) and other actions in the following code, but it is
> not persisted.
> {code:scala}
> def fit(data: RDD[LabeledPoint]): ChiSqSelectorModel = {
> val chiSqTestResult = Statistics.chiSqTest(data).zipWithIndex
> val features = selectorType match {
> case ChiSqSelector.NumTopFeatures =>
> chiSqTestResult
> .sortBy { case (res, _) => res.pValue }
> .take(numTopFeatures)
> {code}
> This issue is reported by our tool CacheCheck, which is used to dynamically
> detecting persist()/unpersist() api misuses.
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