morningman opened a new pull request #5100:
URL: https://github.com/apache/incubator-doris/pull/5100


   ## Proposed changes
   
   Regardless of whether the tablet is submitted for compaction or not,
   we need to call 'reset_compaction' to clean up the base_compaction or 
cumulative_compaction objects
   in the tablet, because these two objects store the tablet's own shared_ptr.
   If it is not cleaned up, the reference count of the tablet will always be 
greater than 1,
   thus cannot be collected by the garbage collector. 
(TabletManager::start_trash_sweep)
   
   This bug is introduced from #4891
   
   ## Types of changes
   
   - [x] Bugfix (non-breaking change which fixes an issue)
   


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