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  1. IMPALA
  2. IMPALA-9317

Improve number of instances estimate for scans in planner

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: Impala 4.0
    • Component/s: Frontend
    • Labels:

      Description

      Currently the number of instances (used for various estimates) is calculated as estimated # hosts * mt_dop. This is suboptimal, because in many cases there isn't enough input data to allow creating that many instances per host.

      The per-host estimate for scans actually already handles this correctly by capping the hosts estimate at the number of input splits - we should use the same approach for number of instance estimates.

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            • Assignee:
              tarmstrong Tim Armstrong
              Reporter:
              tarmstrong Tim Armstrong
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                Updated:
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