morningman commented on issue #3859:
URL: 
https://github.com/apache/incubator-doris/issues/3859#issuecomment-644540827


   > * now, if cumulative_compaction_skip_window_seconds =30 + 
latest_read_version, system will then do compaction every 30s and  
latest_read_version will be ignored
   
   No. with `latest_read_version`, the compaction may be more frequent. For 
example:
   
   1. The current version is 10, publish at 10:00:00.
   2. The following version 11 and 12  publish at 10:00:02 and 10:00:04.
   3. A query request with read version 12 arrive at 10:00:05.
   
   In the old way, the version 12 can be merged after 10:00:34. But in the new 
way, the version 12
   can be merged after 10:00:05.
   
   


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