Github user nchammas commented on a diff in the pull request:
https://github.com/apache/spark/pull/3564#discussion_r22146321
--- Diff: project/SparkBuild.scala ---
@@ -397,15 +427,44 @@ object TestSettings {
javaOptions in Test +=
"-Dspark.executor.extraClassPath=" + (fullClasspath in
Test).value.files.
map(_.getAbsolutePath).mkString(":").stripSuffix(":"),
+
javaOptions += "-Xmx3g",
+
// Show full stack trace and duration in test cases.
testOptions in Test += Tests.Argument("-oDF"),
testOptions += Tests.Argument(TestFrameworks.JUnit, "-v", "-a"),
// Enable Junit testing.
libraryDependencies += "com.novocode" % "junit-interface" % "0.9" %
"test",
- // Only allow one test at a time, even across projects, since they run
in the same JVM
- parallelExecution in Test := false,
- concurrentRestrictions in Global += Tags.limit(Tags.Test, 1),
+
+ // Parallelize execution of tests
+ parallelExecution in Test := true,
+ testForkedParallel in Test := false,
+ concurrentRestrictions in Global :=
Seq(Tags.limit(Tags.ForkedTestGroup, 8)),
+
+ testGrouping in Test <<= (definedTests in Test, javaOptions in Test)
map groupBySuite,
--- End diff --
Found the answer here btw:
http://stackoverflow.com/questions/22795172/sbt-difference-between-and
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