Ethan Rose created HDDS-16798:
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             Summary: Stale or Dead Datanodes whose software is not upgraded 
may still communicate with a finalized SCM
                 Key: HDDS-16798
                 URL: https://issues.apache.org/jira/browse/HDDS-16798
             Project: Apache Ozone
          Issue Type: Bug
            Reporter: Siyao Meng


Only all HEALTHY nodes need to be upgraded for SCM start finalization, but once 
SCM finalizes, it should not allow communication with nodes in the older 
software. However this is checked at the time of registration and STALE and 
DEAD nodes can heartbeat back to SCM without reregistering. This should be 
fixable in the general case by sending a reregister command in response to any 
node that heartbeats a software version less than SCM when it is finalized



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