FrankChen021 commented on issue #9755:
URL: https://github.com/apache/druid/issues/9755#issuecomment-664769493


   @jihoonson I don't understand how segment generations work. Let me give my 
understanding as below. 
   
   1st, it's a property on a segment; 
   2nd, its value will increase after compaction or overwrite. And if the new 
value reaches the value of `numGenerationsToKeep`, the old ones will be 
deleted. 
   
   Is that right ? If it's, my question is,  if the value of 
`numGenerationsToKeep` is 3, does that mean the old segments will be deleted 
after compaction for 3 times ? 


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