Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/8942#issuecomment-149440116
Here it is:
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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