devmadhuu opened a new pull request, #6360:
URL: https://github.com/apache/ozone/pull/6360

   ## What changes were proposed in this pull request?
   This PR change provides a new API in Recon for explicit removal of DEAD or 
decommissioned nodes explicitly.
   
   Since Recon has no way to know when to stop tracking any DEAD or 
decommissioned node , Recon will continue to list DEAD or decommissioned nodes 
forever. Because sometimes DEAD or decommissioned nodes may come back and 
rejoin cluster. In some cases, it is being observed that some DNs being 
formatted and wipes out complete metadata of cluster and then recommissioned 
back to rejoin cluster with different UUID, so there is absolutely no way for 
ozone/recon to know if it is same node and to make things simpler, it is being 
suggested that explicit removal of DEAD or decommissioned datanode should be 
supported whenever admin user acknowledges to stop tracking such datanodes.
   
   ## What is the link to the Apache JIRA
   https://issues.apache.org/jira/browse/HDDS-10409
   
   
   ## How was this patch tested?
   Patch is tested with new integration test.


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