vanzin commented on a change in pull request #141: [LIVY-551] Add "doAs" 
impersonation support
URL: https://github.com/apache/incubator-livy/pull/141#discussion_r251675173
 
 

 ##########
 File path: 
server/src/main/scala/org/apache/livy/server/batch/BatchSession.scala
 ##########
 @@ -55,12 +54,11 @@ object BatchSession extends Logging {
       id: Int,
       request: CreateBatchRequest,
       livyConf: LivyConf,
-      accessManager: AccessManager,
       owner: String,
+      impersonatedUser: Option[String],
       sessionStore: SessionStore,
       mockApp: Option[SparkApp] = None): BatchSession = {
     val appTag = s"livy-batch-$id-${Random.alphanumeric.take(8).mkString}"
-    val impersonatedUser = accessManager.checkImpersonation(request.proxyUser, 
owner, livyConf)
 
 Review comment:
   It's just moving the check to the servlet, which happens before this is 
called. Are you worried that another call site might be added and we forget 
about the access check?

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