Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/3741#issuecomment-67921986
@JoshRosen Exactly, yes. Even though JNI Calls the java method,
runAsSparkUser is covered codes only inside braces. The following is a simple
example.
```scala
class SparkHadoopUtilSuite extends FunSuite {
test("runAsSparkUser scope") {
var hadoopUser: HadoopUser = null
SparkHadoopUtil.get.runAsSparkUser{ () =>
hadoopUser = new HadoopUser
Console.println(s"in scope, same thread ${hadoopUser.getUsername}")
new Thread() {
override def run() = Console.println(s"in scope, different thread,
${hadoopUser.getUsername}")
}.run()
}
Console.println(s"out of scope, same thread, ${hadoopUser.getUsername}")
new Thread() {
override def run() = Console.println(s"out of scope, different
thread, ${hadoopUser.getUsername}")
}.run()
}
}
class HadoopUser {
def getUsername: String =
UserGroupInformation.getCurrentUser.getShortUserName
}
```
```bash
jl$ SPARK_USER=testUSER mvn test
SparkHadoopUtilSuite:
2014-12-23 13:50:47.426 java[73906:867795] Unable to load realm info from
SCDynamicStore
in scope, same thread testUSER
in scope, different thread, testUSER
out of scope, same thread, jl
out of scope, different thread, jl
```
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