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  1. Lucene - Core
  2. LUCENE-4512

Additional memory savings in CompressingStoredFieldsIndex.MEMORY_CHUNK

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.1, 6.0
    • Component/s: None
    • Labels:
      None
    • Lucene Fields:
      New

      Description

      Robert had a great idea to save memory with CompressingStoredFieldsIndex.MEMORY_CHUNK: instead of storing the absolute start pointers we could compute the mean number of bytes per chunk of documents and only store the delta between the actual value and the expected value (avgChunkBytes * chunkNumber).

      By applying this idea to every n(=1024?) chunks, we would even:

      • make sure to never hit the worst case (delta ~= maxStartPointer)
      • reduce memory usage at indexing time.

        Attachments

        1. LUCENE-4512.patch
          22 kB
          Adrien Grand
        2. LUCENE-4512.patch
          20 kB
          Adrien Grand

          Activity

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            • Assignee:
              jpountz Adrien Grand
              Reporter:
              jpountz Adrien Grand
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              • Created:
                Updated:
                Resolved: