Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/338#discussion_r11328357
--- Diff:
core/src/main/scala/org/apache/spark/ui/jobs/JobProgressListener.scala ---
@@ -92,8 +91,10 @@ private[ui] class JobProgressListener(conf: SparkConf)
extends SparkListener {
stageIdToTasksActive.remove(s.stageId)
stageIdToTasksComplete.remove(s.stageId)
stageIdToTasksFailed.remove(s.stageId)
+ stageIdToTaskData.remove(s.stageId)
+ stageIdToExecutorSummaries.remove(s.stageId)
stageIdToPool.remove(s.stageId)
- if (stageIdToDescription.contains(s.stageId))
{stageIdToDescription.remove(s.stageId)}
--- End diff --
Ah I see - this is because we're using the Scala HashMap?
```
scala> import scala.collection.mutable.HashMap
import scala.collection.mutable.HashMap
scala> val x = new HashMap[String, String]()
x: scala.collection.mutable.HashMap[String,String] = Map()
scala> x.remove("nonexistent")
res0: Option[String] = None
```
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