Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/5685#issuecomment-96905575
I found the issue. Turns out `SerializationDebugger` currently cannot
serialize `ClosureCleanerSuite2` due to
[SPARK-7180](https://issues.apache.org/jira/browse/SPARK-7180). In a nutshell,
it turns out that the debugger currently doesn't handle the case where an
object both (1) inherits a serializable parent, and (2) has a non-serializable
field. The reason why it passed for me locally before was because the debugger
was somehow not
[enabled](https://github.com/apache/spark/blob/4d9e560b5470029143926827b1cb9d72a0bfbeff/core/src/main/scala/org/apache/spark/serializer/SerializationDebugger.scala#L62),
and I suspect this has something to do with the fact that I'm running Java 6.
I was able to reproduce the exception locally by always enabling the debugger.
Anyway, I have disabled the debugger in the test for now and hopefully it
will pass.
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