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    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Duplicate
    • Fix Version/s: None
    • Component/s: None
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      Description

      Postgresql uses fixed-size commitlog files that it pre-allocates (filling with zeros) so "appending" to the log can use cheaper fsync-without-metadata (length changes is "metadata"). Then, when a commitlog is not needed, it "recycles" it by renaming it to a higher number. Commitlog entries have an increasing id, and if you come to an out-of-sequence (earlier) id, then you must have have reached the end of the commitlog and are reading from the "recycled" part.

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            • Assignee:
              Unassigned
              Reporter:
              jbellis Jonathan Ellis
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