hemantk-12 opened a new pull request, #4163:
URL: https://github.com/apache/ozone/pull/4163

   ## What changes were proposed in this pull request?
   
   This change is to proactively remove the unnecessary SST files from the 
backup directory which are not needed to generate diff using compaction DAG.
   These files are the one which get compacted to new files at each level. For 
example in the below graph, "000015", "000013", "000011", "000009" get 
compacted to "000018",  "000016", "000017". 
   We don't need "000018",  "000016", "000017" to generate diff because these 
are compaction of previous level .
   
   
![reverseGraph](https://user-images.githubusercontent.com/6820020/211372896-c4f6eada-3fb0-4838-bcc6-08c47606a43f.png)
   
   
   ## What is the link to the Apache JIRA
   https://issues.apache.org/jira/browse/HDDS-7524
   
   ## How was this patch tested?
   * Unit tests
   


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