Anu Engineer created HDFS-11139:
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Summary: 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
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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