robreeves commented on code in PR #50452:
URL: https://github.com/apache/spark/pull/50452#discussion_r2021913156
##########
core/src/main/scala/org/apache/spark/executor/Executor.scala:
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@@ -110,6 +110,21 @@ private[spark] class Executor(
// finish downloading dependencies.
private val updateDependenciesLock = new ReentrantLock()
+ private lazy val mdcIsSupported = {
+ try {
+ // This tests if any class initialization error is thrown
+ val testKey = System.nanoTime().toString
+ MDC.put(testKey, "testValue")
+ MDC.remove(testKey)
+
+ true
+ } catch {
+ case t: Throwable =>
+ logInfo("MDC is not supported.", t)
+ false
+ }
+ }
+
Review Comment:
Good idea. Updated.
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