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https://issues.apache.org/jira/browse/SPARK-21004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-21004.
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    Resolution: Won't Fix

Agree, but, this is really too minor to bother with in one issue, and, this 
function will be removed shortly when 2.10 support goes away.

> remove the never used declaration in function warnDeprecatedVersions
> --------------------------------------------------------------------
>
>                 Key: SPARK-21004
>                 URL: https://issues.apache.org/jira/browse/SPARK-21004
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: yangZhiguo
>            Priority: Minor
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> the function {warnDeprecatedVersions} of class SparkContext, the declaration 
> of 
> val javaVersion = System.getProperty("java.version").split("[+.\\-]+", 3) 
> is never used in this function



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