- 
    Type:Bug 
- 
    Resolution: Duplicate
- 
    Priority:Major - P3 
- 
    None
- 
    Affects Version/s: None
- 
    Component/s: Replication
- 
        ALL
- 
        None
- 
        None
- 
        None
- 
        None
- 
        None
- 
        None
- 
        None
For the purposes of w:majority, the majority calculation includes arbiters. Since arbiters do not store a copy of the data, they will never report that they have successfully replicated the write in question. This makes it difficult to design fault-tolerant clusters that utilize multiple datacenters without having extra data-bearing nodes.
- duplicates
- 
                    SERVER-13070 Including arbiters when calculating replica set majority can break balancing / prevents fault-tolerant majority writes -         
- Closed
 
-         
- is related to
- 
                    SERVER-7681 Report majority number in ReplSetGetStatus/isMaster -         
- Closed
 
-