Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/12678#issuecomment-215242079
> If the jar/file is there that it will be in the classpath when spark is
launched
For jars it's not as simple as that. But your previous instructions are
correct; you need to do *both* of the following:
- distribute the jar file using --files (or --jars although for this case
--files is slightly better)
- add its *name* (not the full path) to
`spark.{driver,executor}.extraClassPath`
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