nickva commented on issue #3948:
URL: https://github.com/apache/couchdb/issues/3948#issuecomment-1069187996


   @tonysun83 yeah, we could mimic the `couch_util:get_value(Key, 
SortedResults)` => `undefined` for missing entries, but I wonder if we should 
double-check how we end up in this state.
   
   I could see ending up here if we hit a `timeout` error but it looks like we 
end up there from the first clause in: 
https://github.com/apache/couchdb/blob/e4b8a4624fc7ae09b4649aac9a8d68226208cd8b/src/fabric/src/fabric_doc_update.erl#L41-L45
   
   `ok | accepted | error` so guessing would it's probably `error`? Or is it 
because we got a bunch of `rexi_DOWN` or `rexi_EXIT` and called `skip_message` 
https://github.com/apache/couchdb/blob/e4b8a4624fc7ae09b4649aac9a8d68226208cd8b/src/fabric/src/fabric_doc_update.erl#L62-L74?
   
   In general for `undefined`, we should probably emit a `missing_response` or 
`internal_server_error`. It's interesting what our guarantees are with respect 
to what return code we emit then, should it be a 201/202 even if we didn't get 
any results for some docs...


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