Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/12123#issuecomment-205648608
LGTM but we should consider the case of using HistoryServer.
When we use HistoryServer, SparkContext is not defined so the user name
should be always `<unknown>`.
You can use REST based status API to get the user name even though we use
HistoryServer.
Supporting HistoryServer can be separated from this PR.
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