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  1. Jackrabbit Oak
  2. OAK-5655

TarMK: Analyse locality of reference

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Details

    • Task
    • Status: Open
    • Major
    • Resolution: Unresolved
    • None
    • None
    • segment-tar

    Description

      We need to better understand the locality aspects of content stored in TarMK:

      • How is related content spread over segments?
      • What content do we consider related?
      • How does locality of related content develop over time when changes are applied?
      • What changes do we consider typical?
      • What is the impact of compaction on locality?
      • What is the impact of the deduplication caches on locality (during normal operation and during compaction)?
      • How good are checkpoints deduplicated? Can we monitor this online?
      • ...

      Attachments

        1. segment-reads.png
          223 kB
          Michael Dürig
        2. segment-per-path-compacted-nostringcache.png
          5 kB
          Michael Dürig
        3. segment-per-path-compacted-nocache.png
          5 kB
          Michael Dürig
        4. segment-per-path-compacted.png
          5 kB
          Michael Dürig
        5. segment-per-path.png
          6 kB
          Michael Dürig
        6. offrc.jfr
          4.07 MB
          Michael Dürig
        7. data00053a.tar-reads.png
          45 kB
          Michael Dürig
        8. compaction-time-vs-reposize.m
          0.3 kB
          Michael Dürig
        9. compaction-time-vs.reposize.png
          75 kB
          Michael Dürig

        Issue Links

        relates to

        Improvement - An improvement or enhancement to an existing feature or task. OAK-1905 SegmentMK: Arch segment(s)

        • Minor - Minor loss of function, or other problem where easy workaround is present.
        • Open

        Improvement - An improvement or enhancement to an existing feature or task. OAK-4558 SegmentNodeState.fastEquals() can trigger two I/O operations

        • Minor - Minor loss of function, or other problem where easy workaround is present.
        • Resolved

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            Unassigned Unassigned
            mduerig Michael Dürig
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              Updated:

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