Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/2982#discussion_r22691185
--- Diff: pom.xml ---
@@ -980,15 +1142,17 @@
<reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
<junitxml>.</junitxml>
<filereports>SparkTestSuite.txt</filereports>
- <argLine>-ea -Xmx3g -XX:MaxPermSize=${MaxPermGen}
-XX:ReservedCodeCacheSize=512m</argLine>
+ <argLine>-ea -Xmx3g -XX:MaxPermSize=${MaxPermGen}
-XX:ReservedCodeCacheSize=${CodeCacheSize}</argLine>
<stderr/>
+ <environmentVariables>
+
<SPARK_DIST_CLASSPATH>${test_classpath}</SPARK_DIST_CLASSPATH>
--- End diff --
Can you add a comment so that it's clear what is going on? Something like:
```
<!-- Setting SPARK_DIST_CLASSPATH is a simple way to make sure any child
processes launched
by the tests have access to the correct test-time classpath -->
```
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