[SPARK-10564] ThreadingSuite: assertion failures in threads don't fail the test

[andrewor14]

This commit ensures if an assertion fails within a thread, it will ultimately fail the test. Otherwise we end up potentially masking real bugs by not propagating assertion failures properly.

[srowen]

LGTM

[SparkQA]

Test build #42346 has finished for PR 8723 at commit a64e7c9.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class MultilayerPerceptronClassifier(JavaEstimator, HasFeaturesCol, HasLabelCol, HasPredictionCol,
  • class MultilayerPerceptronClassificationModel(JavaModel):
  • class MinMaxScaler(JavaEstimator, HasInputCol, HasOutputCol):
  • class MinMaxScalerModel(JavaModel):
  • ("thresholds", "Thresholds in multi-class classification to adjust the probability of " +
  • class HasElasticNetParam(Params):
  • class HasFitIntercept(Params):
  • class HasStandardization(Params):
  • class HasThresholds(Params):
  • thresholds = Param(Params._dummy(), "thresholds", "Thresholds in multi-class classification to adjust the probability of predicting each class. Array must have length equal to the number of classes, with values >= 0. The class with largest value p/t is predicted, where p is the original probability of that class and t is the class' threshold.")
  • self.thresholds = Param(self, "thresholds", "Thresholds in multi-class classification to adjust the probability of predicting each class. Array must have length equal to the number of classes, with values >= 0. The class with largest value p/t is predicted, where p is the original probability of that class and t is the class' threshold.")

[andrewor14]

retest this please

[andrewor14]

This actually already passed the ThreadingSuite, so I'm merging it into master and 1.5. Thanks @srowen.

[SparkQA]

Test build #42355 has finished for PR 8723 at commit a64e7c9.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.