kfaraz commented on issue #17594:
URL: https://github.com/apache/druid/issues/17594#issuecomment-2656301644

   >  Why did you remove the decommissioningMaxPercentOfMaxSegmentsToMove 
configuration that allowed us to configure the historical as deccommision, then 
set this config to 0 to tell the coordinator not to handoff all those segments.
   
   @BagamSingular , could you please elaborate how you were using this config?
   
   The `decommissioningNodes` field was intended to mark certain historicals as 
decommissioning so that all segments could be quickly moved away from them, as 
is currently done by Druid. You should not be using this field for any other 
purpose.
   
   Moreoever, the Coordinator only tries to rebalance segments if a server has 
gone offline.
   The `decommissioningMaxPercentOfMaxSegmentsToMove` played no part in it, as 
that applies only to live servers.
   
   In your case, IIUC, you restart a historical and it takes 20 mins to 
bootstrap. While the bootstrap is happening, the coordinator reassigns all the 
missing segments to other historicals.
   
   If this is indeed the case, then you may try using these configs for the 
time being:
   
   ```
   smartSegmentLoading: false
   maxSegmentsInNodeLoadingQueue: 0
   replicationThrottleLimit: 100 (or any other value that suits you depending 
on the total number of segments in your cluster)
   ```


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