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  1. Lucene - Core
  2. LUCENE-7351

BKDWriter should compress doc ids when all values in a block are the same

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 6.2, 7.0
    • Component/s: None
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      BKDWriter writes doc ids using 4 bytes per document. I think it should compress similarly to postings when all docs in a block have the same packed value. This can happen either when a field has a default value which is common across documents or when quantization makes the number of unique values so small that a large index will necessarily have blocks that all contain the same value (eg. there are only 63490 unique half-float values).

        Attachments

        1. LUCENE-7351.patch
          14 kB
          Adrien Grand
        2. LUCENE-7351.patch
          17 kB
          Adrien Grand
        3. LUCENE-7351.patch
          19 kB
          Adrien Grand

          Activity

            People

            • Assignee:
              Unassigned
              Reporter:
              jpountz Adrien Grand
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              Dates

              • Created:
                Updated:
                Resolved: