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  1. WiredTiger
  2. WT-7534

Investigate FTDC drops during checkpoint prepare

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    • Type: Icon: Improvement Improvement
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
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    • Affects Version/s: None
    • Component/s: None
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    • 5
    • Storage - Ra 2021-08-09

      I noticed that FTDC keeps dropping (along with performance) when a checkpoint starts. This happens mostly when prepare stage of the checkpoint starts.

      Attached FTDC from a run, and here is a screenshot:

      Notice that even when there is no workload running, FTDC drops out. It will be useful to investigate why, and possibly fix FTDC drop, so that we can continue to get signal on what is going on with WiredTiger/Workload during the prepare stage.

        2. ftdc-drops.png
          168 kB
          Sulabh Mahajan
        3. image-2021-07-27-17-27-16-727.png
          62 kB
          Etienne Petrel
        4. image-2021-07-28-13-30-02-899.png
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          Etienne Petrel
        5. image-2021-07-28-13-31-58-846.png
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          Etienne Petrel
        6. image-2021-07-28-16-52-27-046.png
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          Etienne Petrel
        7. image-2021-07-28-16-52-56-300.png
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          Etienne Petrel
        8. image-2021-07-30-17-11-31-662.png
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          Etienne Petrel
        9. image-2021-08-03-12-58-12-205.png
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          Etienne Petrel
        10. mongodb_many_coll_sleep_30s.log
          30.24 MB
          Etienne Petrel
        11. no clear no scale.png
          66 kB
          Etienne Petrel
        12. table locks.png
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          Etienne Petrel

            Assignee:
            etienne.petrel@mongodb.com Etienne Petrel
            Reporter:
            sulabh.mahajan@mongodb.com Sulabh Mahajan
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              Created:
              Updated:
              Resolved: