turboFei commented on code in PR #7011:
URL: https://github.com/apache/kyuubi/pull/7011#discussion_r2026423016


##########
kyuubi-server/src/main/scala/org/apache/kyuubi/session/KyuubiSessionImpl.scala:
##########
@@ -167,18 +167,21 @@ class KyuubiSessionImpl(
                 warn(s"Error on de-registering engine [${engine.engineSpace} 
$host:$port]", e)
             }
 
+          var engineClient: KyuubiSyncThriftClient = null
           try {
             val passwd =
               if (sessionManager.getConf.get(ENGINE_SECURITY_ENABLED)) {
                 InternalSecurityAccessor.get().issueToken()
               } else {
                 Option(password).filter(_.nonEmpty).getOrElse("anonymous")
               }
-            _client = KyuubiSyncThriftClient.createClient(user, passwd, host, 
port, sessionConf)
+            engineClient =
+              KyuubiSyncThriftClient.createClient(user, passwd, host, port, 
sessionConf)

Review Comment:
   FYI:
   ```
   2025-04-02 21:06:10.785 ERROR [pool-11-thread-1] 
org.apache.kyuubi.ebay.carmel.gateway.session.CarmelSessionStateChecker: Failed 
to check carmel session status SessionHandle 
[54ce2fb6-db99-4caf-ab0a-e17c60e4cc5c], retry 3
   : java.lang.NullPointerException: Cannot invoke 
"org.apache.kyuubi.shaded.hive.service.rpc.thrift.TSessionHandle.getSessionId()"
 because "tHandle" is null
        at 
org.apache.kyuubi.session.SessionHandle$.apply(SessionHandle.scala:38)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.asyncRequestExecutor$lzycompute(KyuubiSyncThriftClient.scala:78)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.asyncRequestExecutor(KyuubiSyncThriftClient.scala:75)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.$anonfun$withLockAcquiredAsyncRequest$1(KyuubiSyncThriftClient.scala:164)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.$anonfun$withLockAcquired$1(KyuubiSyncThriftClient.scala:160)
        at org.apache.kyuubi.Utils$.withLockRequired(Utils.scala:392)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.withLockAcquired(KyuubiSyncThriftClient.scala:156)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.withLockAcquiredAsyncRequest(KyuubiSyncThriftClient.scala:163)
        at 
org.apache.kyuubi.client.KyuubiSyncThriftClient.getInfo(KyuubiSyncThriftClient.scala:278)
        at 
org.apache.kyuubi.ebay.carmel.gateway.session.CarmelSessionStateChecker$$anon$1.$anonfun$call$1(CarmelSessionStateChecker.scala:48)
        at scala.Option.map(Option.scala:230)
        at 
org.apache.kyuubi.ebay.carmel.gateway.session.CarmelSessionStateChecker$$anon$1.call(CarmelSessionStateChecker.scala:47)
        at 
org.apache.kyuubi.ebay.carmel.gateway.session.CarmelSessionStateChecker$$anon$1.call(CarmelSessionStateChecker.scala:41)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:833)
   ```



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