Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/7066#issuecomment-116799897
@SaintBacchus my concern with this approach is that different executors may
get different configurations. However, I looked at this quickly and I don't see
a better workaround. This seems to only affect YARN client mode where the
`YarnClientSchedulerBackend` calls `super.start()` before setting
`spark.yarn.credentials.file`. I think the approach here is reasonable.
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