Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/8867#issuecomment-149372740
OK, I think I know the issue - the reason is probably that the credentials
are cached in the `FileSystem` instance using which the write happens. Since we
are replacing the credentials but not the `FileSystem` instance itself this
might not work, which is why #8942 works. We can do with either that approach
or we can replace the `FileSystem` instance which would require a close and
reopen of the file.
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