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https://issues.apache.org/jira/browse/HDFS-11139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anu Engineer resolved HDFS-11139.
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Resolution: Won't Fix
> Ozone: SCM: Handle duplicate Datanode ID
> -----------------------------------------
>
> Key: HDFS-11139
> URL: https://issues.apache.org/jira/browse/HDFS-11139
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Anu Engineer
> Assignee: Anu Engineer
> Priority: Major
> Labels: OzonePostMerge, tocheck
> Fix For: HDFS-7240
>
>
> The Datanode ID is used when a data node registers. It is assumed that
> datanodes are unique across the cluster.
> However due to operator error or other cases we might encounter duplicate
> datanode ID. SCM should be able to recognize this and handle in correctly.
> Here is a sub-set of datanode scenarios it needs to handle.
> 1. Normal Datanode
> 2. Copy of a Datanode metadata by operator to another node
> 3. A Datanode being renamed - hostname change
> 4. Container Reports -- 2 machines with same datanode ID. SCM thinks they are
> same node.
> 5. Decommission -- we decommission both nodes if IDs are same.
> 6. Commands will be send to both nodes.
> So it is necessary that SCM identity when a datanode is reusing a datanode ID
> that is already used by another node.
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