Github user dragos commented on the pull request:
https://github.com/apache/spark/pull/9282#issuecomment-151530146
There's no clear answer, unfortunately. The serializer has a "default class
loader" that is set explicitly only when using the REPL. In the other cases
it's done through the context class loader, for example in
[SparkSubmit](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala#L636).
In the coarse-grained mode there seems to be some explicit class loader
handling, but in the debugger I noticed it's due to another context class
loader (seems to be set by a Hadoop class via `runAsSparkUser`).
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