Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19272#discussion_r150049429
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
---
@@ -159,6 +151,12 @@ class CoarseGrainedSchedulerBackend(scheduler:
TaskSchedulerImpl, val rpcEnv: Rp
scheduler.getExecutorsAliveOnHost(host).foreach { exec =>
killExecutors(exec.toSeq, replace = true, force = true)
}
+
+ case UpdateDelegationTokens(newDelegationTokens) =>
+ // Update the driver's delegation tokens in case new executors are
added later.
--- End diff --
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