Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/15088#discussion_r78706645
--- Diff: core/src/main/scala/org/apache/spark/util/ThreadStackTrace.scala
---
@@ -24,4 +24,9 @@ private[spark] case class ThreadStackTrace(
threadId: Long,
threadName: String,
threadState: Thread.State,
- stackTrace: String)
+ stackTrace: String,
+ blockedByThreadId: Long,
--- End diff --
How about using Option instead of negative/null values? not much difference
either way. I'm not sure if thread IDs can be negative ever.
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