Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/4811#issuecomment-76487495
LGTM. I ran into a bug running the example, but it seems to be coming from
elsewhere. It happens when calling train---and not all the time, only
sometimes:
```
java.lang.ClassCastException: scala.None$ cannot be cast to java.util.List
at
org.apache.spark.api.python.PythonAccumulatorParam.addInPlace(PythonRDD.scala:745)
at org.apache.spark.Accumulable.$plus$plus$eq(Accumulators.scala:82)
at
org.apache.spark.Accumulators$$anonfun$add$2.apply(Accumulators.scala:340)
at
org.apache.spark.Accumulators$$anonfun$add$2.apply(Accumulators.scala:335)
at
scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
at
scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98)
at
scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98)
at
scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
at scala.collection.mutable.HashMap.foreach(HashMap.scala:98)
at
scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
at org.apache.spark.Accumulators$.add(Accumulators.scala:335)
at
org.apache.spark.scheduler.DAGScheduler.updateAccumulators(DAGScheduler.scala:892)
at
org.apache.spark.scheduler.DAGScheduler.handleTaskCompletion(DAGScheduler.scala:974)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1398)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1362)
at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)
15/02/27 14:41:29 ERROR DAGScheduler: Failed to update accumulators for
ResultTask(279, 4)
java.lang.ClassCastException: scala.None$ cannot be cast to java.util.List
at
org.apache.spark.api.python.PythonAccumulatorParam.addInPlace(PythonRDD.scala:745)
at org.apache.spark.Accumulable.$plus$plus$eq(Accumulators.scala:82)
at
org.apache.spark.Accumulators$$anonfun$add$2.apply(Accumulators.scala:340)
at
org.apache.spark.Accumulators$$anonfun$add$2.apply(Accumulators.scala:335)
at
scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
at
scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98)
at
scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:98)
at
scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:226)
at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:39)
at scala.collection.mutable.HashMap.foreach(HashMap.scala:98)
at
scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
at org.apache.spark.Accumulators$.add(Accumulators.scala:335)
at
org.apache.spark.scheduler.DAGScheduler.updateAccumulators(DAGScheduler.scala:892)
at
org.apache.spark.scheduler.DAGScheduler.handleTaskCompletion(DAGScheduler.scala:974)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1398)
at
org.apache.spark.scheduler.DAGSchedulerEventProcessLoop.onReceive(DAGScheduler.scala:1362)
at org.apache.spark.util.EventLoop$$anon$1.run(EventLoop.scala:48)
```
I'll make a separate JIRA for it.
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