Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/17244#discussion_r105489812
--- Diff: core/src/main/scala/org/apache/spark/TaskContextImpl.scala ---
@@ -57,57 +68,75 @@ private[spark] class TaskContextImpl(
// Whether the task has failed.
@volatile private var failed: Boolean = false
+ // Throwable that caused the task to fail
+ private var failure: Throwable = _
+
// If there was a fetch failure in the task, we store it here, to make
sure user-code doesn't
// hide the exception. See SPARK-19276
@volatile private var _fetchFailedException:
Option[FetchFailedException] = None
+ @GuardedBy("this")
override def addTaskCompletionListener(listener:
TaskCompletionListener): this.type = {
- onCompleteCallbacks += listener
+ synchronized {
--- End diff --
nit: method synchronized instead of block ?
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