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  1. Jackrabbit Oak
  2. OAK-6984

High read IO in compaction retry cycles

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      We have seen unusual high read IO in compaction retry cycles in our longevity tests at Adobe.

      Above picture shows the CPU utilisation during an online compaction run, which starts at 03:00. At about 03:22 CPU user time drops and CPU waiting for IO time increases. This point in time coincides with the start of the first retry cycle of compaction.

      Attachments

        1. readwrite.png
          70 kB
          Michael Dürig
        2. readwrite.m
          2 kB
          Michael Dürig
        3. gcmetrics-20.png
          51 kB
          Michael Dürig
        4. gcmetrics-15.png
          53 kB
          Michael Dürig
        5. gcmetrics.m
          1 kB
          Michael Dürig
        6. extract.sc
          3 kB
          Michael Dürig
        7. cycle-times.png
          86 kB
          Michael Dürig
        8. cycles.png
          61 kB
          Michael Dürig
        9. cpu.png
          183 kB
          Michael Dürig
        10. compactioncycles.m
          0.5 kB
          Michael Dürig

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            mduerig Michael Dürig
            mduerig Michael Dürig
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              Updated:
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