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  1. HBase
  2. HBASE-17339

Scan-Memory-First Optimization for Get Operations

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Not A Problem
    • None
    • None
    • None
    • None

    Description

      The current implementation of a get operation (to retrieve values for a specific key) scans through all relevant stores of the region; for each store both memory components (memstores segments) and disk components (hfiles) are scanned in parallel.
      We suggest to apply an optimization that speculatively scans memory-only components first and only if the result is incomplete scans both memory and disk.

      Attachments

        1. HBASE-17339-V01.patch
          6 kB
          Eshcar Hillel
        2. HBASE-17339-V02.patch
          29 kB
          Eshcar Hillel
        3. HBASE-17339-V03.patch
          46 kB
          Eshcar Hillel
        4. HBASE-17339-V03.patch
          46 kB
          Eshcar Hillel
        5. HBASE-17339-V04.patch
          46 kB
          Eshcar Hillel
        6. HBASE-17339-V05.patch
          48 kB
          Eshcar Hillel
        7. HBASE-17339-V06.patch
          49 kB
          Eshcar Hillel
        8. read-latency-mixed-workload.jpg
          35 kB
          Eshcar Hillel

        Issue Links

          relates to

          Improvement - An improvement or enhancement to an existing feature or task. HBASE-17655 Removing MemStoreScanner and SnapshotScanner

          • Major - Major loss of function.
          • Resolved
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          Web Link Review Board

          Activity

            People

              eshcar Eshcar Hillel
              eshcar Eshcar Hillel
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              Dates

                Created:
                Updated:
                Resolved: