sodonnel opened a new pull request, #4644:
URL: https://github.com/apache/ozone/pull/4644

   ## What changes were proposed in this pull request?
   
   ContainerReplicaPendingOps contains a record of all the pending replications 
which are waiting to complete across the cluster. When SCM steps down as a 
leader, and a new one takes over, the pending commands on the datanodes are 
dropped as they check the leader term before they are processed.
   
   This means the contents of ContainerReplicaPendingOps is not needed if the 
SCM fails back to the original node. Therefore, if the SCM becomes active 
again, we should clear the pending ops when RM is transitioning to the RUNNING 
state.
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-8473
   
   ## How was this patch tested?
   
   New unit tests added.
   


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