ange-k opened a new pull request, #4478:
URL: https://github.com/apache/bookkeeper/pull/4478

   ### Motivation
   
   `RackawareEnsemblePlacementPolicyImpl.reorderReadSequence` has a feature to 
sort Bookies with poor performance.
   
   Currently, the code checks the entire Ensemble for unavailable Bookies and 
performs reordering if any are found. However, since the sorting is done within 
the WriteSet, checking the Ensemble is overkill (except when the sizes are the 
same).
   
   This change modifies the code to check and reorder only the Bookies within 
the WriteSet. Since the Bookies that are read from are ultimately selected from 
the WriteSet, there is no need to check the entire Ensemble, which can be 
misleading to readers of the code.
   
   By focusing the checks on the WriteSet, future developers will be able to 
understand the logic more easily without wondering if there is a specific 
reason for checking the entire Ensemble.
   
   ### Changes
   
   - Modified `RackawareEnsemblePlacementPolicyImpl.reorderReadSequence` to 
check and reorder only the Bookies within the WriteSet instead of the entire 
Ensemble.
   


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