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  1. Core Server
  2. SERVER-41472

Create a workload to demonstrate the MongoDB usage difficulties of the WT WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat

    • Type: Icon: Task Task
    • Resolution: Duplicate
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Storage
    • Labels:
    • Storage Execution

      The WT_STAT_CONN_CACHE_LOOKASIDE_SCORE stat does not work well as a means for MongoDB to recognize cache pressure in the WT layer because it does not move like we need it to do.

      In SERVER-36956 we replaced WT_STAT_CONN_CACHE_LOOKASIDE_SCORE with the WT_STAT_CONN_CACHE_LOOKASIDE_INSERT stat. This is because we saw problems noted in SERVER-40685, where the lookaside score can remain high even after cache pressure goes down.

      The goal of this ticket is to create a workload to give to WT to demonstrate the problem so that they can fix it and confirm the problem is resolved.

            backlog-server-execution [DO NOT USE] Backlog - Storage Execution Team
            dianna.hohensee@mongodb.com Dianna Hohensee (Inactive)
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