Github user squito commented on the pull request:
https://github.com/apache/spark/pull/4220#issuecomment-71923273
I kinda see what is going on with the tests now. A [test case in
SparkSubmitSuite](https://github.com/apache/spark/blob/master/core/src/test/scala/org/apache/spark/deploy/SparkSubmitSuite.scala#L91)
adds a non-existent jar to the system properties. That property never gets
cleared, so later jobs which should submit successfully, are still trying to
load that jar.
I don't understand how your change is effecting this, though, or how this
ever worked before. Maybe this change is exposing some lurking error --
something which just "happened" to work before. It seems like having multiple
apps futzing w/ the system properties at the same time is bound to create
problems.
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