Details

    • Type: Improvement Improvement
    • Status: Resolved
    • Priority: Minor Minor
    • Resolution: Duplicate
    • Fix Version/s: 2.1 beta1
    • Component/s: None
    • Labels:
      None

      Description

      Changing the row cache to a row+filter cache would make it much more useful. We currently have to warn against using the row cache with wide rows, where the read pattern is typically a peek at the head, but this usecase would be perfect supported by a cache that stored only columns matching the filter.

      Possible implementations:

      • (copout) Cache a single filter per row, and leave the cache key as is
      • Cache a list of filters per row, leaving the cache key as is: this is likely to have some gotchas for weird usage patterns, and it requires the list overheard
      • Change the cache key to "rowkey+filterid": basically ideal, but you need a secondary index to lookup cache entries by rowkey so that you can keep them in sync with the memtable
      • others?
      1. 0002-add-query-cache.patch
        6 kB
        Vijay
      2. 0002-1956-updates-to-thrift-and-avro-v0.patch
        1 kB
        Vijay
      3. 0001-row-cache-filter.patch
        106 kB
        Daniel Doubleday
      4. 0001-re-factor-row-cache.patch
        38 kB
        Vijay
      5. 0001-commiting-block-cache.patch
        39 kB
        Vijay
      6. 0001-1956-cache-updates-v0.patch
        36 kB
        Vijay

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            • Assignee:
              Vijay
              Reporter:
              Stu Hood
              Reviewer:
              Sylvain Lebresne
            • Votes:
              4 Vote for this issue
              Watchers:
              28 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development