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  1. Core Server
  2. SERVER-80853

$out on secondary node can produce incorrect results if primary steps down

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 8.1.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • Query Execution
    • Fully Compatible
    • ALL
    • v8.0, v7.0, v6.0
    • QE 2025-01-20, QE 2025-02-03, QE 2025-02-17

      1. $out starts on a secondary. It creates a `temp` collection and starts writing to it.
      2. Election happens and a new primary steps up. On stepup `temp` collections are dropped.
      3. $out on the secondary continues running and will start targeting upcoming inserts to the new primary.
      4. Since the `temp` collection has been dropped on step (2), the write at (3) will implicitly recreate it.
      5. $out finishes successfully, but documents written before step (2) are missing.

        1. 0001-Repro-SERVER-80853.patch
          6 kB

            Assignee:
            kristina.znam@mongodb.com Kristina Znam
            Reporter:
            jordi.serra-torrens@mongodb.com Jordi Serra Torrens
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              Created:
              Updated:
              Resolved: