igreenfield commented on a change in pull request #28629:
URL: https://github.com/apache/spark/pull/28629#discussion_r446797352
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File path: core/src/test/scala/org/apache/spark/util/ThreadUtilsSuite.scala
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@@ -25,11 +25,27 @@ import scala.concurrent.duration._
import scala.util.Random
import org.scalatest.concurrent.Eventually._
+import org.slf4j.MDC
import org.apache.spark.SparkFunSuite
class ThreadUtilsSuite extends SparkFunSuite {
+ test("newDaemonSingleThreadExecutor with MDC") {
+ val appIdValue = s"appId-${System.currentTimeMillis()}"
+ MDC.put("appId", appIdValue)
Review comment:
For the driver is true. for the Executor as it is in another process it
should be called explicitly by the user.
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