Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/8678#discussion_r39151883
--- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala
---
@@ -901,7 +901,7 @@ class DAGScheduler(
// the stage as completed here in case there are no tasks to run
markStageAsFinished(stage, None)
- val debugString = stage match {
+ def debugString: String = stage match {
--- End diff --
Is this really expensive to compute? it doesn't look that heavy. But you
can already just pass the expression as the argument to `logDebug` and I think
it will be lazily evaluated? Only mostly sure about that.
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