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  1. Apache Ozone
  2. HDDS-3667

If we gracefully stop datanode it would be better to notify scm and recon

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      if you execute `bin/ozone --daemon stop datanode`, datanode would be better if it handle the signal and the stop dn request to scm, then scm update datanode state to dead.

      It would be better if you provide a admin cli tool to support remove datanode manually.

      ozone admin datanode remove <UUID>
      

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            leosun08 Lisheng Sun
            maobaolong Baolong Mao

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