Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/22360
@srowen The delegated `mllib.BisectingKMeansModel` is:
```
class BisectingKMeansModel private[clustering] (
private[clustering] val root: ClusteringTreeNode,
@Since("2.4.0") val distanceMeasure: String
) extends...
```
its constructor argument `distanceMeasure` is immutable and the
`setDistanceMeasure` here only change the wrapper model's param and it effect
nothing.
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