Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5560#discussion_r28641569
--- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
@@ -2132,6 +2136,93 @@ private[spark] object Utils extends Logging {
.getOrElse(UserGroupInformation.getCurrentUser().getShortUserName())
}
+ /**
+ * Adds a shutdown hook with default priority.
+ */
+ def addShutdownHook(hook: () => Unit): AnyRef = {
--- End diff --
It looked weird to return `AnyRef`, but I suppose that while callers need a
handle to the hook, they don't need to be promised anything about what it is.
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