cloud-fan commented on a change in pull request #31119:
URL: https://github.com/apache/spark/pull/31119#discussion_r556317573
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/exchange/BroadcastExchangeExec.scala
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@@ -74,7 +74,9 @@ case class BroadcastExchangeExec(
child: SparkPlan) extends BroadcastExchangeLike {
import BroadcastExchangeExec._
- override val runId: UUID = UUID.randomUUID
+ private val groupId =
sparkContext.getLocalProperty(SparkContext.SPARK_JOB_GROUP_ID)
+
+ override val runId: UUID =
Option(groupId).map(UUID.fromString).getOrElse(UUID.randomUUID)
Review comment:
nit: we can inline `groupId` here to save a `val`, which will increase
the size of the serialized plan. We should also add a comment to explain it.
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