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https://issues.apache.org/jira/browse/SPARK-21906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Saisai Shao closed SPARK-21906.
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Resolution: Not A Problem
> No need to runAsSparkUser to switch UserGroupInformation in YARN mode
> ---------------------------------------------------------------------
>
> Key: SPARK-21906
> URL: https://issues.apache.org/jira/browse/SPARK-21906
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, YARN
> Affects Versions: 2.2.0
> Reporter: Kent Yao
>
> 1、The Yarn application‘s ugi is determined by the ugi launching it
> 2、 runAsSparkUser is used to switch a ugi as same as itself, because we have
> already set {code:java} env("SPARK_USER") =
> UserGroupInformation.getCurrentUser().getShortUserName() {code} in the am
> container context
> {code:java}
> def runAsSparkUser(func: () => Unit) {
> val user = Utils.getCurrentUserName() // get the user itself
> logDebug("running as user: " + user)
> val ugi = UserGroupInformation.createRemoteUser(user) // create a new ugi
> use itself
> transferCredentials(UserGroupInformation.getCurrentUser(), ugi) //
> transfer its own credentials
> ugi.doAs(new PrivilegedExceptionAction[Unit] { // doAs as itseft
> def run: Unit = func()
> })
> }
> {code}
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