Github user JoshRosen commented on the issue:

    https://github.com/apache/spark/pull/15034
  
    @jkbradley, it looks like this is legitimately failing MiMa (not sure why 
it passed on the first run...):
    
    ```
    [error]  * the type hierarchy of object org.apache.spark.ml.clustering.LDA 
is different in current version. Missing types 
{org.apache.spark.ml.util.DefaultParamsReadable}
    [error]    filter with: 
ProblemFilters.exclude[MissingTypesProblem]("org.apache.spark.ml.clustering.LDA$")
    ```


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