ashishkumar50 commented on PR #7249:
URL: https://github.com/apache/ozone/pull/7249#issuecomment-2410936607

   @slfan1989 Thanks for the improvement.
   
   >  We then send the deletion command to these 6 DNs, and the command 
executes normally, successfully deleting 6 blocks. However, if DN7 to DN9 are 
not selected, our deletion process will get stuck.
   
   In your case whether any DN was slow or unhealthy? causing not to be 
selected for deletion.
   With current behaviour SCM will keep track of remaining DN7 to DN9, until it 
waits to be successfully deleted.
   After your change it requires all DN1 to DN9 to be in healthy and normal 
state, so that SCM will send deletion request in one time and process it.
   But in certain case(may have happened in your environment as well) when some 
DNs are unhealthy or slow. In this case SCM will keep waiting and space reclaim 
from all DNs will halt for some time because of particular unhealthy DN.  Do we 
need to consider this?


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