Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8911#issuecomment-143349924
There's code in different places that set `SPARK_YARN_MODE`, but there's no
code to unset it. So, to follow your example, if you start a context with
yarn-client and later start another one in standalone mode, the latter will use
the YARN version of the utils class.
Other than that, looks sane. This is another piece of code that will need
some serious thought when trying to fix the "Spark doesn't allow multiple
contexts" issue, though.
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