[SPARK-17421] Document warnings about "MaxPermSize" parameter when building with Maven and Java 8

• Type: Improvement
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 2.0.1, 2.1.0
• Component/s: Build
• Assignee: Frederick Reiss
• Reporter: Frederick Reiss
• Created: 06/Sep/16 22:17
• Updated: 22/Sep/16 09:32
• Resolved: 22/Sep/16 09:31

Description

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.

Issue Links

• links to: [Github] Pull Request #14986 (frreiss)
• links to: [Github] Pull Request #15005 (frreiss)