Details

    • Type: Improvement Improvement
    • Status: Resolved
    • Priority: Major Major
    • Resolution: Fixed
    • Fix Version/s: 1.2.0 beta 1
    • Component/s: None
    • Labels:

      Description

      The row index contains entries for configurably sized blocks of a wide row. For a row of appreciable size, the row index ends up directing the third seek (1. index, 2. row index, 3. content) to nearby the first column of a scan.

      Since the row index is always used for wide rows, and since it contains information that tells us whether or not the 3rd seek is necessary (the column range or name we are trying to slice may not exist in a given sstable), promoting the row index into the sstable index would allow us to drop the maximum number of seeks for wide rows back to 2, and, more importantly, would allow sstables to be eliminated using only the index.

      An example usecase that benefits greatly from this change is time series data in wide rows, where data is appended to the beginning or end of the row. Our existing compaction strategy gets lucky and clusters the oldest data in the oldest sstables: for queries to recently appended data, we would be able to eliminate wide rows using only the sstable index, rather than needing to seek into the data file to determine that it isn't interesting. For narrow rows, this change would have no effect, as they will not reach the threshold for indexing anyway.

      A first cut design for this change would look very similar to the file format design proposed on #674: http://wiki.apache.org/cassandra/FileFormatDesignDoc: row keys clustered, column names clustered, and offsets clustered and delta encoded.

      1. 2319-v1.tgz
        64 kB
        Stu Hood
      2. 2319-v2.tgz
        62 kB
        Stu Hood
      3. promotion.pdf
        25 kB
        Stu Hood
      4. version-f.txt
        2 kB
        Stu Hood
      5. version-g.txt
        2 kB
        Stu Hood
      6. version-g-lzf.txt
        2 kB
        Stu Hood

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            • Assignee:
              Sylvain Lebresne
              Reporter:
              Stu Hood
              Reviewer:
              Stu Hood
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              • Created:
                Updated:
                Resolved:

                Development