Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/3741#issuecomment-68227400
@tnachen switch_user is disabled, a user id running mesos is `hdfs` both
master and slave, and a user id running apps are `1001079`, `rake`. And I've
run simple app - that I made - for testing reading data from hdfs, writing data
to hdfs, with groupBy function. We use spark as multi user environment for
submitting several apps running concurrently.
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