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  1. Core Server
  2. SERVER-59060

SBE replans far more aggressively than classic engine

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    • Icon: Task Task
    • Resolution: Fixed
    • Icon: Major - P3 Major - P3
    • 5.1.0-rc0
    • None
    • None
    • None
    • Fully Compatible
    • QE 2021-08-23

    Description

      SBE will replan if the cached plan uses more works than the 'decisionReads'. See here. The classic engine only replans when the cached plan usesĀ ~10x more works than expected. See here.

      This could lead to scenarios where the query system repeatedly evicts cached plans when it isn't really necessary.

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            ian.boros@mongodb.com Ian Boros
            ian.boros@mongodb.com Ian Boros
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              Updated:
              Resolved: