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  1. Core Server
  2. SERVER-66462

Change stream pre-image write performance degrades under certain conditions

    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 6.0.0-rc11, 6.1.0-rc0
    • Affects Version/s: 6.0.0-rc5
    • Component/s: None
    • None
    • Fully Compatible
    • ALL
    • v6.0
    • QE 2022-05-30, QE 2022-06-13, QE 2022-06-27
    • 35

      Update/delete operation throughput can severely (>10x) decrease when the change stream pre-images are enabled and more than one collection with change stream pre-images enabled is/has been active in terms of updates/deletes performed. 
      The problem manifests almost always in throughput/latency change stream with pre-images tests. The impact can be seen on the second and subsequent test runs within a task. There is some randomness aspect caused by random assignment of unique ids to collections. The test sample in which the problem manifests: 15_whenAvailablefdbc_preImage_1c_avg_latency.
       

            Assignee:
            mindaugas.malinauskas@mongodb.com Mindaugas Malinauskas
            Reporter:
            mindaugas.malinauskas@mongodb.com Mindaugas Malinauskas
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              Created:
              Updated:
              Resolved: