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https://issues.apache.org/jira/browse/SPARK-1911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16199666#comment-16199666
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Swaapnika Guntaka commented on SPARK-1911:
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Does this issue still exist with Spark-2.2.?
> Warn users if their assembly jars are not built with Java 6
> -----------------------------------------------------------
>
> Key: SPARK-1911
> URL: https://issues.apache.org/jira/browse/SPARK-1911
> Project: Spark
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 1.1.0
> Reporter: Andrew Or
> Assignee: Sean Owen
> Fix For: 1.2.2, 1.3.0
>
>
> The root cause of the problem is detailed in:
> https://issues.apache.org/jira/browse/SPARK-1520.
> In short, an assembly jar built with Java 7+ is not always accessible by
> Python or other versions of Java (especially Java 6). If the assembly jar is
> not built on the cluster itself, this problem may manifest itself in strange
> exceptions that are not trivial to debug. This is an issue especially for
> PySpark on YARN, which relies on the python files included within the
> assembly jar.
> Currently we warn users only in make-distribution.sh, but most users build
> the jars directly. At the very least we need to emphasize this in the docs
> (currently missing entirely). The next step is to add a warning prompt in the
> mvn scripts whenever Java 7+ is detected.
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