xuanyuanking commented on a change in pull request #24892: [SPARK-25341][Core]
Support rolling back a shuffle map stage and re-generate the shuffle files
URL: https://github.com/apache/spark/pull/24892#discussion_r295732974
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File path: core/src/main/scala/org/apache/spark/TaskContext.scala
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@@ -183,6 +183,17 @@ abstract class TaskContext extends Serializable {
@Evolving
def resources(): Map[String, ResourceInformation]
+ /**
+ * The shuffle generation ID of the stage that this task belongs to, it
returns the stage
+ * attempt number while the stage is not determinate and returns none on the
contrary.
+ */
+ def getShuffleGenerationId(shuffleId: Int): Option[Int] = {
Review comment:
Yeah, thanks for the advice, compared with using Option in Java code, I
change all places to use -1. Done in 5a4b8b8.
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