Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4627#issuecomment-74606437
It looks like `removeShutdownHook` here can get called _during_ shutdown,
which leads to some exceptions that might prevent other cleanup from taking
place:
```
Exception in thread "delete Spark local dirs"
java.lang.IllegalStateException: Shutdown in progress
at
java.lang.ApplicationShutdownHooks.remove(ApplicationShutdownHooks.java:82)
at java.lang.Runtime.removeShutdownHook(Runtime.java:239)
at
org.apache.spark.storage.DiskBlockManager.stop(DiskBlockManager.scala:151)
at
org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply$mcV$sp(DiskBlockManager.scala:141)
at
org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
at
org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
at
org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1613)
at
org.apache.spark.storage.DiskBlockManager$$anon$1.run(DiskBlockManager.scala:139)
Exception in thread "delete Spark local dirs"
java.lang.IllegalStateException: Shutdown in progress
at
java.lang.ApplicationShutdownHooks.remove(ApplicationShutdownHooks.java:82)
at java.lang.Runtime.removeShutdownHook(Runtime.java:239)
at
org.apache.spark.storage.DiskBlockManager.stop(DiskBlockManager.scala:151)
at
org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply$mcV$sp(DiskBlockManager.scala:141)
at
org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
at
org.apache.spark.storage.DiskBlockManager$$anon$1$$anonfun$run$1.apply(DiskBlockManager.scala:139)
at
org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1613)
at
org.apache.spark.storage.DiskBlockManager$$anon$1.run(DiskBlockManager.scala:139)
```
@srowen @MattWhelan Can you fix this or file a JIRA?
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