Github user ajbozarth commented on the pull request:
https://github.com/apache/spark/pull/12123#issuecomment-206623940
I just pushed an update. I changed how I get the username so it uses the
same method for both active and history. This method actually pulls the
information from the same source as both sc.sparkUser and the API do at their
root, the system env. Except with this method we make sure we always get the
correct user; I noticed a race condition when using sc.sparkUser while finding
this solution. After starting up the master when two spark applications are
started at once, one by the user who started the master and one who didn't,
both would appear to been started by the user who started the master. This
would only happened on the first apps started, any apps started after would
behave as expected. This race condition doesn't exist with my change.
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