Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18519#discussion_r133290499
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/CoarseGrainedSchedulerBackend.scala
---
@@ -95,6 +99,12 @@ class CoarseGrainedSchedulerBackend(scheduler:
TaskSchedulerImpl, val rpcEnv: Rp
// The num of current max ExecutorId used to re-register appMaster
@volatile protected var currentExecutorIdCounter = 0
+ // hadoop token manager used by some sub-classes (e.g. Mesos)
+ protected var hadoopDelegationTokenManager:
Option[HadoopDelegationTokenManager] = None
--- End diff --
This should be a `val`. Just override it in the subclass.
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