lgcareer opened a new pull request #4626:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4626
## What is the purpose of the pull request
*When the server exist in the dead server list of zk,need stop service
byself*
## Brief change log
*(for example:)*
- *Add RegisterOperator*
- *Add stop service self in HeartBeatTask*
- *update shutdownlook*
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