Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/7322#issuecomment-120071606
I looked at the branch-1.3 version of the code, to make sure I didn't break
this with the launcher refactoring... and the only place where this env
variable is read is in `YarnClientSchedulerBackend.scala` - exactly the same as
in master.
Given that we don't really want to add support for more environment
variables, I don't think adding this brings any value. The right way to do this
is through the configuration file, or using either `--conf` or
`--executor-cores` in the command line.
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