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https://issues.apache.org/jira/browse/HDFS-12282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121355#comment-16121355
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Weiwei Yang commented on HDFS-12282:
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Attached a WIP patch, I will submit a working patch once HDFS-12283 is resolved.

> 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
>         Attachments: HDFS-12282.WIP.patch
>
>
> 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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