Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18519#discussion_r133294684
--- 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
+
+ // Hadoop delegation tokens to be sent to the executors.
+ protected var hadoopDelegationCreds: Option[Array[Byte]] = None
--- End diff --
So, another option here is have this be a `val` and have
`hadoopDelegationTokenManager` be a `def`. The latter means there's no
initialization order issue (so no need for the `lazy val` hack). Since this is
really only done once, that should be fine.
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