wen-hemin opened a new pull request #5805:
URL: https://github.com/apache/dolphinscheduler/pull/5805


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   ## Purpose of the pull request
   
   When the master server or worker server is started and the service is shut 
down, 
   log error : 
   ```
   org.apache.dolphinscheduler.spi.register.RegistryException: zookeeper remove 
error
        at 
org.apache.dolphinscheduler.plugin.registry.zookeeper.ZookeeperRegistry.remove(ZookeeperRegistry.java:202)
 ~[na:na]
        at 
org.apache.dolphinscheduler.service.registry.RegistryCenter.remove(RegistryCenter.java:156)
 ~[classes/:na]
        at 
org.apache.dolphinscheduler.server.master.registry.MasterRegistryClient.unRegistry(MasterRegistryClient.java:374)
 ~[classes/:na]
        at 
org.apache.dolphinscheduler.server.master.registry.MasterRegistryClient.closeRegistry(MasterRegistryClient.java:135)
 ~[classes/:na]
        at 
org.apache.dolphinscheduler.server.master.MasterServer.close(MasterServer.java:178)
 [classes/:na]
        at 
org.apache.dolphinscheduler.server.master.MasterServer.lambda$run$0(MasterServer.java:145)
 [classes/:na]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_112]
   Caused by: java.lang.IllegalStateException: Expected state [STARTED] was 
[STOPPED]
        at 
org.apache.curator.shaded.com.google.common.base.Preconditions.checkState(Preconditions.java:823)
 ~[na:na]
        at 
org.apache.curator.framework.imps.CuratorFrameworkImpl.checkState(CuratorFrameworkImpl.java:432)
 ~[curator-framework-4.3.0.jar:4.3.0]
        at 
org.apache.curator.framework.imps.CuratorFrameworkImpl.delete(CuratorFrameworkImpl.java:452)
 ~[curator-framework-4.3.0.jar:4.3.0]
        at 
org.apache.dolphinscheduler.plugin.registry.zookeeper.ZookeeperRegistry.remove(ZookeeperRegistry.java:200)
 ~[na:na]
        ... 6 common frames omitted
   ```
   
   Reason:
   The "registry center close" logic already exists in the master server.
   ```
               // close
               this.masterSchedulerService.close();
               this.nettyRemotingServer.close();
               this.masterRegistryClient.closeRegistry();
   ```
   
   The "registry center close" logic also exists in the ServerNodeManager class.
   ```
       /**
        * destroy
        */
       @PreDestroy
       public void destroy() {
           executorService.shutdownNow();
           registryClient.close();
       }
   ```
   
   So, Need to remove "registryClient.close();" in the ServerNodeManager class.
   
   ## Brief change log
   
   Remove "registryClient.close();" in the ServerNodeManager class.
   
   ## Verify this pull request
   
   <!--*(Please pick either of the following options)*-->
   
   This pull request is already covered by existing tests, such as *(please 
describe tests)*.
   
   <!--*(example:)*
     - *Added dolphinscheduler-dao tests for end-to-end.*
     - *Added CronUtilsTest to verify the change.*
     - *Manually verified the change by testing locally.* -->
   


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