Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/4688#discussion_r25475241
--- Diff:
core/src/main/scala/org/apache/spark/executor/CoarseGrainedExecutorBackend.scala
---
@@ -105,6 +107,14 @@ private[spark] class CoarseGrainedExecutorBackend(
executor.stop()
context.stop(self)
context.system.shutdown()
+
+ // Add new credentials received from the driver to the current user.
+ case UpdateCredentials(newCredentials) =>
--- End diff --
Would it be feasible to write the new credentials to HDFS and just send
their location in this message? That way the security of this feature doesn't
depend on securing the Spark transport layer.
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