morningman opened a new pull request #4255:
URL: https://github.com/apache/incubator-doris/pull/4255


   ## Proposed changes
   
   In some very special circumstances, such as code bugs, or human 
misoperation, etc., all replicas of some tablets may be lost. In this case, the 
data has been substantially lost. However, in some scenarios, the business 
still hopes to ensure that the query will not report errors even if there is 
data loss, and reduce the perception of the user layer. At this point, we can 
use the blank Tablet to fill the missing replica to ensure that the query can 
be executed normally.
   
   Add a new FE config `recover_with_empty_tablet`. default is false. true 
means to use empty tablet to fill the missing one.
   
   ## Types of changes
   
   - [x] Bugfix (non-breaking change which fixes an issue)
   - [x] Documentation Update (if none of the other choices apply)
   
   ## Checklist
   
   - [x] I have create an issue on #4254, and have described the bug/feature 
there in detail
   - [x] Compiling and unit tests pass locally with my changes
   - [x] If this change need a document change, I have updated the document
   


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