kocolosk commented on issue #3939:
URL: https://github.com/apache/couchdb/issues/3939#issuecomment-1048949348


   Oh, and as to the consistency violation -- I strongly suspect we're immune, 
because the ultimate source of truth for whether the update is committed is in 
the normal `couch_db_updater` logic, where we've run all manner of tests 
stressing the correctness of the system under concurrent load. We could have 
plenty of cases where `C1` and `C2` are both writing attachment data to disk 
concurrently, but in the end the revision tree for a particular shard copy will 
only commit the update from one of them in interactive mode.
   
   


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