tswstarplanet opened a new issue #3187:
URL: https://github.com/apache/incubator-dolphinscheduler/issues/3187
*For better global communication, please give priority to using English
description, thx! *
**Describe the bug**
look at the method of MasterRegistry
```java
public void unRegistry() {
String address = getLocalAddress();
String localNodePath = getMasterPath();
zookeeperRegistryCenter.getZookeeperCachedOperator().remove(localNodePath);
logger.info("master node : {} unRegistry to ZK.", address);
}
```
The method, which is invoke when close the MasterServer, does not shutdown
the Heartbeat thread pool.
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