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https://issues.apache.org/jira/browse/SPARK-17421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15477864#comment-15477864
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Frederick Reiss commented on SPARK-17421:
-----------------------------------------
Committer feedback on first PR was that the necessary build changes to fix this
issue are too substantial to be appropriate. Created a second PR that only
documents the compile warnings as a known issue and explains why these warnings
occur even when the user sets MAVEN_OPTS.
> Warnings about "MaxPermSize" parameter when building with Maven and Java 8
> --------------------------------------------------------------------------
>
> Key: SPARK-17421
> URL: https://issues.apache.org/jira/browse/SPARK-17421
> Project: Spark
> Issue Type: Bug
> Components: Build
> Reporter: Frederick Reiss
> Priority: Minor
>
> When building Spark with {{build/mvn}} or {{dev/run-tests}}, a Java warning
> appears repeatedly on STDERR:
> {{OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=512M; support
> was removed in 8.0}}
> This warning is due to {{build/mvn}} adding the {{-XX:MaxPermSize=512M}}
> option to {{MAVEN_OPTS}}. When compiling with Java 7, this parameter is
> essential. With Java 8, the parameter leads to the warning above.
> Because {{build/mvn}} adds {{MaxPermSize}} to {{MAVEN_OPTS}}, even if that
> environment variable doesn't contain the option, setting {{MAVEN_OPTS}} to a
> string that does not contain {{MaxPermSize}} has no effect.
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