Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/7394#issuecomment-121339696
In Client mode, the SparkContext would not know about the staging dir,
because the stagingDir is set in SparkContext only after the scheduler backend
is created. Changing the order of these things is something I don't want to
mess with. For this reason, the `YarnClientSchedulerBackend` cannot actually
start the `ExecutorDelegationTokenUpdater` there (since we'd need to know where
the credential files are).
I will change the direct initialization of `ExecutorDelegationTokenUpdater`
to `SparkHadoopUtil.startExecutorDelegationTokenRenewer`
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