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  1. IMPALA
  2. IMPALA-534

Selective queries over large tables produce unnecessary memory consumption

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Impala 1.1
    • Fix Version/s: Impala 1.1.1
    • Component/s: None
    • Labels:
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      Description

      The scanners only release IO buffers when they have produced rows, so running a very selective query over a large table causes the scanners to accumulate many IO buffers that aren't actually being used. Scanners should release IO buffers periodically regardless of how many rows were produced.

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            • Assignee:
              skye Skye Wanderman-Milne
              Reporter:
              skye Skye Wanderman-Milne
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              • Created:
                Updated:
                Resolved: