50% regression in single multi-update

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    • Type: Bug
    • Resolution: Done
    • Priority: Major - P3
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    • Affects Version/s: 4.4.8, 5.0.2
    • Component/s: None
    • ALL
    • Repl 2021-09-20, Replication 2021-12-13, Replication 2021-12-27, Repl 2022-03-21, Repl 2022-04-04, Repl 2022-04-18, Repl 2022-05-02, Repl 2022-05-16, Repl 2022-05-30, Repl 2022-06-13, Repl 2022-06-27
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      Insert 1M documents like so into a collection:

      {x: 'x'.repeat(100), modified: false}

      Then update like so:

      db.c.updateMany({}, {$set: {modified: true}}, {writeConcern: {w: "majority"}})

      Timings are as follows:

      4.2.15: 56s
4.4.8:  82s
5.0.5:  86s

      PMP profiling shows this seems to be accounted for by contention on the replication coordinator mutex in setMyLastAppliedOpTimeAndWallTimeForward.

        1. contention_44_exhaust.txt
          157 kB

            Assignee:
            Matthew Russotto
            Reporter:
            Bruce Lucas (Inactive)
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            Watchers:
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              Created:
              Updated:
              Resolved: