Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/6973#discussion_r33180609
--- Diff: core/src/main/scala/org/apache/spark/SparkEnv.scala ---
@@ -90,17 +90,25 @@ class SparkEnv (
private var driverTmpDirToDelete: Option[String] = None
private[spark] def stop() {
+
+ if(isStopped) return
--- End diff --
might be better to rewrite this as
```
if (!isStopped) {
// stop everything
}
```
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