Ngone51 commented on a change in pull request #31763:
URL: https://github.com/apache/spark/pull/31763#discussion_r589148712
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File path: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala
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@@ -52,6 +52,13 @@ private[spark] sealed trait MapStatus {
* partitionId of the task or taskContext.taskAttemptId is used.
*/
def mapId: Long
+
+ /**
+ * Extra metadata for map status. This could be used by different
ShuffleManager implementation
+ * to store information they need. For example, a Remote Shuffle Service
ShuffleManager could
+ * store shuffle server information and let reducer task know where to fetch
shuffle data.
+ */
+ def metadata: Option[Serializable]
Review comment:
@hiboyang Thanks for your explanation. I agree that #30763 is too big
for review. But I think we can discuss there first to ensure we towards the
same direction before we deep into details. And when we're on the same page, we
can split the big PR into smaller pieces and start to co-work. Does it sound
good to you?
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