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  1. Jackrabbit Oak
  2. OAK-5278

Improved compaction estimator

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    Details

    • Type: New Feature
    • Status: Resolved
    • Priority: Minor
    • Resolution: Later
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: segment-tar
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      Description

      OAK-4293 introduced a new approach for estimating whether we actually want to run or skip a gc cycle. That approach is purely based on the absolute growth of the repository's on disk footprint.

      I think this can be further refined as with the GCJournal we can effectively extrapolate the amount of garbage at a given point in time given the history of previous gc cycles. E.g. let S_n be the size of the repository and G_n the percentage of garbage right before the n-th gc cycle. We can then linearly extrapolate the garbage G_n+1 for the n+1-the gc cycle along the repository sizes:

      G_n+1 = G_n * (S_k+1 - S_k)/(S_k - S_k-1)
      

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              • Assignee:
                Unassigned
                Reporter:
                mduerig Michael Dürig
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