sodonnel opened a new pull request, #4510:
URL: https://github.com/apache/ozone/pull/4510

   ## What changes were proposed in this pull request?
   
   When sending throttled replication / reconstruction commands, we know if the 
target node is at the replication task limit. If it is, we should add it to an 
exclude list in replicationManager.
   
   When the DN heartbeats, it triggers a callback to RM, which lets it check if 
the node should be removed from the exclude list.
   
   The exclude list can then be fed into the node selection for reconstruction 
tasks, so it can avoid picking nodes which are already overloaded as targets, 
but that will be another Jira.
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-8334
   
   ## How was this patch tested?
   
   New unit tests added.


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