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https://issues.apache.org/jira/browse/SPARK-21476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16094392#comment-16094392
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Sean Owen commented on SPARK-21476:
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Not sure whom to ask, but [~josephkb] or [~bryanc] maybe? it looks like
transform() calls transformerImpl(), except in a few cases where subclasses
override the former and then don't have it call the latter. So
RandomForestClassificationModel defines transformImpl but it isn't evidently
used because its parent, ProbabilisticClassifier, overrides transform.
> RandomForest classification model not using broadcast in transform
> ------------------------------------------------------------------
>
> Key: SPARK-21476
> URL: https://issues.apache.org/jira/browse/SPARK-21476
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 2.2.0
> Reporter: Saurabh Agrawal
>
> I notice significant task deserialization latency while running prediction
> with pipelines using RandomForestClassificationModel. While digging into the
> source, found that the transform method in RandomForestClassificationModel
> binds to its parent ProbabilisticClassificationModel and the only concrete
> definition that RandomForestClassificationModel provides and which is
> actually used in transform is that of predictRaw. Broadcasting is not being
> used in predictRaw.
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