bowenliang123 commented on code in PR #5182:
URL: https://github.com/apache/kyuubi/pull/5182#discussion_r1299903908


##########
kyuubi-server/src/main/scala/org/apache/kyuubi/session/SessionLimiter.scala:
##########
@@ -101,14 +101,21 @@ class SessionLimiterImpl(userLimit: Int, ipAddressLimit: 
Int, userIpAddressLimit
   }
 }
 
-class SessionLimiterWithUnlimitedUsersImpl(
+class SessionLimiterWithAccessControlListImpl(
     userLimit: Int,
     ipAddressLimit: Int,
     userIpAddressLimit: Int,
-    var unlimitedUsers: Set[String])
+    var unlimitedUsers: Set[String],
+    var limitedUsers: Set[String])
   extends SessionLimiterImpl(userLimit, ipAddressLimit, userIpAddressLimit) {
   override def increment(userIpAddress: UserIpAddress): Unit = {
-    if (!unlimitedUsers.contains(userIpAddress.user)) {
+    val user = userIpAddress.user
+    if (StringUtils.isNotBlank(user) && limitedUsers.contains(user)) {

Review Comment:
   I'm not familiar with the usage of SessionLimiter. Is this the right way or 
timing to do the rejection here?  cc @wForget 



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