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  1. Core Server
  2. SERVER-14403

Change w:majority write concern to indicate a majority of voting nodes

    • Type: Icon: Improvement Improvement
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 2.7.8
    • Affects Version/s: None
    • Component/s: Replication
    • None

      In systems with non-voting nodes, confirmed w:majority writes might in some circumstances still roll back. This is because rollback is precluded by ensuring that a majority of voting nodes are aware of the write, but w:majority in a system with a high ratio of non-voting to voting nodes might not ensure this.

      Conversely, on clusters with a high non-voting to voting ratio, w:majority is really too strong a requirement for committedness. Only the majority of the voting nodes need to respond, to be safe from rollback.

      The work of this ticket is to change the meaning of "w:majority" to indicate acceptance of a write from the majority of voting nodes. No built-in write concern will provide the old functionality.

            matt.dannenberg Matt Dannenberg
            schwerin@mongodb.com Andy Schwerin
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