viirya commented on code in PR #52620:
URL: https://github.com/apache/spark/pull/52620#discussion_r2459073303
##########
core/src/main/scala/org/apache/spark/util/Clock.scala:
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@@ -58,7 +58,7 @@ private[spark] trait Clock {
/**
* A clock backed by the actual time from the OS as reported by the `System`
API.
*/
-private[spark] class SystemClock extends Clock {
+private[spark] class SystemClock extends Clock with Serializable {
Review Comment:
Why we need this?
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