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https://issues.apache.org/jira/browse/SPARK-1911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tathagata Das resolved SPARK-1911.
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       Resolution: Fixed
    Fix Version/s:     (was: 1.0.1)
                   1.0.0

https://github.com/apache/spark/pull/859/files

> Warn users that jars should be built with Java 6 for PySpark to work on YARN
> ----------------------------------------------------------------------------
>
>                 Key: SPARK-1911
>                 URL: https://issues.apache.org/jira/browse/SPARK-1911
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Documentation
>            Reporter: Andrew Or
>             Fix For: 1.0.0
>
>
> Jars created by Java 7 o 
> This is especially a big problem especially for PySpark. Currently we warn 
> users only in make-distribution.sh, but most users build the jars directly. 
> We should emphasize it in the docs especially for PySpark and YARN because 
> this issue is not trivial to debug.



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