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  1. HBase
  2. HBASE-8001

Avoid unnecessary lazy seek

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.94.5
    • Fix Version/s: 0.98.0, 0.95.2
    • Component/s: regionserver
    • Labels:
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    • Hadoop Flags:
      Reviewed

      Description

      Lazy seek helps to reduce the real seek needed for multi hfile, when the kv from newer hfile is enough to satisfy the query.

      While in many case, it just push the real seek later, and do not reduce the number of real seek. e.g. there are only one hfile, or storefilescanner is closed and only one left, or the scan need to go through all the versions, or there are only one version of row and a sequence scan is performed. In these case, lazy seek just bring extra overhead.

        Attachments

        1. HBASE-8001_onescanner_v2.patch
          0.8 kB
          Raymond Liu
        2. HBASE-8001_onescanner.patch
          2 kB
          Raymond Liu

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              • Assignee:
                colorant Raymond Liu
                Reporter:
                colorant Raymond Liu
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                • Created:
                  Updated:
                  Resolved: