Github user frreiss commented on a diff in the pull request:
https://github.com/apache/spark/pull/15005#discussion_r79766509
--- Diff: docs/building-spark.md ---
@@ -16,24 +16,27 @@ Building Spark using Maven requires Maven 3.3.9 or
newer and Java 7+.
### Setting up Maven's Memory Usage
-You'll need to configure Maven to use more memory than usual by setting
`MAVEN_OPTS`. We recommend the following settings:
+If you are compiling with Java 7, you'll need to configure Maven to use
more memory than usual by setting `MAVEN_OPTS`:
--- End diff --
Leaving out `-XX:ReservedCodeCacheSize` caused a warning in my tests:
```OpenJDK 64-Bit Server VM warning: CodeCache is full. Compiler has been
disabled.
OpenJDK 64-Bit Server VM warning: Try increasing the code cache size using
-XX:ReservedCodeCacheSize=```
Left that option in and reworded the beginning of this section as you
suggested.
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