Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/295#discussion_r11234507
--- Diff: project/SparkBuild.scala ---
@@ -169,6 +169,7 @@ object SparkBuild extends Build {
fork := true,
javaOptions in Test += "-Dspark.home=" + sparkHome,
javaOptions in Test += "-Dspark.testing=1",
+ javaOptions in Test += "-Dsun.io.serialization.extendedDebugInfo=true",
--- End diff --
Only on failures AFIACT. It is verbose then, but I can't imagine a case
where you don't actually want that info if there is a failure.
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