Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4405#issuecomment-73308548
That should already be handled.
- `CoarseGrainedExecutorBackend` does run the executor inside a `doAs`
block, run as `SPARK_USER`
- Yarn actually runs the underlying container processes as the requesting
user too (unlike standalone)
- HDFS authorization is done through the delegation tokens generated by the
driver (see `Client.scala:obtainTokensForNamenodes`).
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