cxzl25 commented on issue #3870:
URL:
https://github.com/apache/incubator-kyuubi/issues/3870#issuecomment-1340500433
It seems that this UT left an engine that has not been deleted.
```
02:47:40.314 ScalaTest-main-running-AdminResourceSuite INFO
AdminResourceSuite:
===== TEST OUTPUT FOR o.a.k.server.api.v1.AdminResourceSuite: 'delete engine
- connection share level' =====
--conf
spark.kyuubi.ha.engine.ref.id=d669955a-09be-4cfa-90c9-9f725f354dee \
```
### Server Log
```
02:47:48.371 KyuubiRestFrontendService-222-EventThread INFO
ConnectionStateManager: State change: CONNECTED
02:47:48.372 KyuubiRestFrontendService-222 INFO AdminResource: Deleting
engine
node:/kyuubi_test_1.7.0-SNAPSHOT_CONNECTION_SPARK_SQL/runner/d669955a-09be-4cfa-90c9-9f725f354dee/serviceUri=localhost:39345;version=1.7.0-SNAPSHOT;kyuubi.engine.id=local-1669690062739;refId=d669955a-09be-4cfa-90c9-9f725f354dee;sequence=0000000000
02:47:48.378 Curator-Framework-0 INFO CuratorFrameworkImpl:
backgroundOperationsLoop exiting
02:47:48.379 ProcessThread(sid:0 cport:42289): INFO PrepRequestProcessor:
Processed session termination for sessionid: 0x1000017408d0005
02:47:48.379 KyuubiRestFrontendService-222 INFO ZooKeeper: Session:
0x1000017408d0005 closed
```
### Engine Log
```
22/11/29 02:47:48 INFO ZookeeperDiscoveryClient: Zookeeper client connection
state changed to: CONNECTED
22/11/29 02:47:48 INFO ZookeeperDiscoveryClient: Created a
/kyuubi_test_1.7.0-SNAPSHOT_CONNECTION_SPARK_SQL/runner/d669955a-09be-4cfa-90c9-9f725f354dee/serviceUri=localhost:39345;version=1.7.0-SNAPSHOT;kyuubi.engine.id=local-1669690062739;refId=d669955a-09be-4cfa-90c9-9f725f354dee;sequence=0000000000
on ZooKeeper for KyuubiServer uri: localhost:39345
22/11/29 02:47:48 INFO EngineServiceDiscovery:
Service[EngineServiceDiscovery] is started.
22/11/29 02:47:48 INFO SparkTBinaryFrontendService:
Service[SparkTBinaryFrontend] is started.
...
22/11/29 02:48:32 ERROR ZookeeperDiscoveryClient: Zookeeper client
connection state changed to: LOST, but failed to reconnect in 1 seconds. Give
up retry and stop gracefully .
22/11/29 02:48:32 INFO SparkSQLEngine: Service: [SparkTBinaryFrontend] is
stopping.
```
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