In MongoDB 2.6, we alerted users if they added a replica set member when it was down. To aid in automation, we should consider restoring similar functionality:

replset:PRIMARY> rs.add('1.2.3.7:27017')
{ "down" : [ "1.2.3.6:27017", "1.2.3.7:27017" ], "ok" : 1 }

Original Summary

rs.addArb does not return an error when host is unavailable

Original Description

I am using MongoDB Enterprise Version 3.4.6.

rs.addArb(host)

return

MongoDB shell version v3.4.6
connecting to: mongodb://127.0.0.1:27017/admin
MongoDB server version: 3.4.6
{ "ok" : 1 }

when host is not available.

It should have the same behaviour as rs.add(host).

=> Difficult to catch the error during automation.