Github user ArtRand commented on the issue:
https://github.com/apache/spark/pull/19272
@vanzin Thanks for the continued review. I addressed the comments you left.
PTAL.
It seems simplest and more robust to keep the serialized `Credentials`
within `CoarseGrainedSchedulerBackend`. The change is that now the renewal time
is also kept along side. I tried to move as much duplicate code to
`HadoopDelegationTokenManager` which remains a "toolbox" as before and doesn't
retain much state. The abstract class `HadoopCredentialRenewer` is now part of
the scheduler backend also. I refrained from changing too much of the YARN
specific code.
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