Github user sameeragarwal commented on a diff in the pull request:
https://github.com/apache/spark/pull/17244#discussion_r105779991
--- Diff: core/src/main/scala/org/apache/spark/TaskContext.scala ---
@@ -105,7 +105,11 @@ abstract class TaskContext extends Serializable {
/**
* Adds a (Java friendly) listener to be executed on task completion.
- * This will be called in all situation - success, failure, or
cancellation.
+ * This will be called in all situation - success, failure, or
cancellation. Adding a listener
+ * to an already completed task will result in that listeners being
called immediately.
--- End diff --
micro nit: s/listeners/listener here and below
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