zhuyaogai commented on code in PR #5182:
URL: https://github.com/apache/kyuubi/pull/5182#discussion_r1304511989


##########
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:
   Thank you very much for your guidance, but I also have some questions.
   1.  As you say `other users are not limited.`, so is the configuration 
`kyuubi.server.limit.connections.user.unlimited.list` still needed?
   2. If we limit connections for some users, do we need to do something 
similar for `ipaddress` and `user-ipaddress`?
   



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