Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18008#discussion_r116885970
--- Diff: core/src/main/scala/org/apache/spark/ui/jobs/UIData.scala ---
@@ -112,9 +112,9 @@ private[spark] object UIData {
/**
* These are kept mutable and reused throughout a task's lifetime to
avoid excessive reallocation.
*/
- class TaskUIData private(
- private var _taskInfo: TaskInfo,
- private var _metrics: Option[TaskMetricsUIData]) {
+ class TaskUIData private(private var _taskInfo: TaskInfo) {
+
+ private[this] var _metrics: Option[TaskMetricsUIData] =
Some(TaskMetricsUIData.EMPTY)
--- End diff --
when will this be None?
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