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  1. Core Server
  2. SERVER-34557

Allow running transactions against primaries with readPreferences other than 'primary'

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.0.0-rc0
    • Component/s: Replication
    • Labels:
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      Description

      We want to restrict transactions to only run on primaries. The way SERVER-33580 accomplished that was by restricting them to only work if the readPreference provided was 'primary'. Drivers, however, may send 'primaryPreferred' when connected to a primary via a direct connection.

      We should undo the server changes from SERVER-33580, and instead change the checkCanServeReadsFor method in ReplicationCoordinator to return false if the node is not currently primary and we're in a transaction.

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