From 307039e47d75ed29760cdebe270cd0ae2d6c9b03 Mon Sep 17 00:00:00 2001
From: jinhyukify <jinhyukify@gmail.com>
Date: Mon, 30 Mar 2026 00:30:23 +0900
Subject: [PATCH] HBASE-30042 Test AuthUtil.loginClient with existing Kerberos
 login

---
 .../hbase/security/TestUsersOperationsWithSecureHadoop.java    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/security/TestUsersOperationsWithSecureHadoop.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/security/TestUsersOperationsWithSecureHadoop.java
index dc5a5ebcfa41..d6c3be69ce9a 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/security/TestUsersOperationsWithSecureHadoop.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/security/TestUsersOperationsWithSecureHadoop.java
@@ -133,13 +133,14 @@ public void testLoginWithUserKeytabAndPrincipal() throws Exception {
   }
 
   @Test
-  public void testAuthUtilLogin() throws Exception {
+  public void testAuthUtilLoginWithExistingLoginUser() throws Exception {
     String clientKeytab = getClientKeytabForTesting();
     String clientPrincipal = getClientPrincipalForTesting();
     Configuration conf = getSecuredConfiguration();
     conf.set(AuthUtil.HBASE_CLIENT_KEYTAB_FILE, clientKeytab);
     conf.set(AuthUtil.HBASE_CLIENT_KERBEROS_PRINCIPAL, clientPrincipal);
     UserGroupInformation.setConfiguration(conf);
+    UserGroupInformation.loginUserFromKeytab(clientPrincipal, clientKeytab);
 
     User user = AuthUtil.loginClient(conf);
     assertTrue(user.isLoginFromKeytab());