Weiwei Yang created HDFS-12282:
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             Summary: Ozone: DeleteKey-4: SCM periodically sends block deletion 
message to datanode via HB and handles response
                 Key: HDFS-12282
                 URL: https://issues.apache.org/jira/browse/HDFS-12282
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: datanode, ozone, scm
            Reporter: Weiwei Yang
            Assignee: Weiwei Yang


This is the task 3 in the design doc, implements the SCM to datanode 
interactions. Including

# SCM sends block deletion message via HB to datanode
# datanode changes block state to deleting when processes the HB response
# datanode sends deletion ACKs back to SCM
# SCM handles ACKs and removes blocks in DB



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