Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/9628#issuecomment-155890911
```
[info] org.apache.spark.SparkException: Job aborted due to stage failure:
Task 4 in stage 54.0 failed 1 times, most recent failure: Lost task 4.0 in
stage 54.0 (TID 130, localhost): java.lang.ClassCastException: scala.Tuple2
cannot be cast to java.lang.Integer
```
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