Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/2343#discussion_r17506390
--- Diff: core/src/main/scala/org/apache/spark/TaskContext.scala ---
@@ -77,6 +77,8 @@ class TaskContext(
/**
* Add a listener in the form of a Scala closure to be executed on task
completion.
* This will be called in all situation - success, failure, or
cancellation.
+ * Exceptions in callbacks are however not thrown back upstream, i.e.
tasks won't marked as
+ * failed even if completion callbacks fail to execute.
--- End diff --
update this comment
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