[SPARK-3050] Spark program running with 1.0.2 jar cannot run against a 1.0.1 cluster

[Mingyu Kim]

I ran a really simple code that runs with Spark 1.0.2 jar and connects to a
Spark 1.0.1 cluster, but it fails with java.io.InvalidClassException. I
filed the bug at https://issues.apache.org/jira/browse/SPARK-3050.

I assumed the minor and patch releases shouldn¹t break compatibility. Is
that correct?

Thanks,
Mingyu

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