Github user cxzl25 commented on the issue:
https://github.com/apache/spark/pull/21656
@maropu @cloud-fan @squito
Can you trigger a test for this?
This is the exception stack in the log:
```
ERROR Utils: uncaught error in thread task-scheduler-speculation, stopping
SparkContext
java.util.NoSuchElementException: MedianHeap is empty.
at org.apache.spark.util.collection.MedianHeap.median(MedianHeap.scala:83)
at
org.apache.spark.scheduler.TaskSetManager.checkSpeculatableTasks(TaskSetManager.scala:968)
at
org.apache.spark.scheduler.Pool$$anonfun$checkSpeculatableTasks$1.apply(Pool.scala:94)
at
org.apache.spark.scheduler.Pool$$anonfun$checkSpeculatableTasks$1.apply(Pool.scala:93)
at scala.collection.Iterator$class.foreach(Iterator.scala:742)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1194)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at org.apache.spark.scheduler.Pool.checkSpeculatableTasks(Pool.scala:93)
at
org.apache.spark.scheduler.Pool$$anonfun$checkSpeculatableTasks$1.apply(Pool.scala:94)
at
org.apache.spark.scheduler.Pool$$anonfun$checkSpeculatableTasks$1.apply(Pool.scala:93)
```
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