cloud-fan commented on a change in pull request #28756:
URL: https://github.com/apache/spark/pull/28756#discussion_r438633426
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File path: core/src/main/scala/org/apache/spark/executor/Executor.scala
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@@ -969,4 +992,7 @@ private[spark] object Executor {
// task is fully deserialized. When possible, the
TaskContext.getLocalProperty call should be
// used instead.
val taskDeserializationProps: ThreadLocal[Properties] = new
ThreadLocal[Properties]
+
+ val MDC_KEY = "mdc."
+ val TASK_MDC_KEY = s"${MDC_KEY}taskName"
Review comment:
It affects end-users, as now they need to use `mdc.taskName` in the
log4j config file, instead of `taskName`.
But it's not released yet, I'm fine to make it consistent that all the MDC
properties start with `mdc.`
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