Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18099#discussion_r118396407
--- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
---
@@ -454,14 +454,20 @@ private[spark] class BlockManager(
case Some(info) =>
val level = info.level
logDebug(s"Level for block $blockId is $level")
+ val taskAttemptId =
Option(TaskContext.get()).map(_.taskAttemptId())
--- End diff --
This is getting the `taskAttemptId` from the main thread, in case a
TaskContext is not propagated properly to all child threads for the task, we
would fail in getting the `taskAttemptId` in `BlockInfoManager`, see the test
case added in this PR.
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